CN114200360B - Three-dimensional coil magnetic field uniformity test method and system - Google Patents

Abstract

The invention provides a method and system for testing the uniformity of a three-dimensional coil magnetic field. The method includes: selecting six three-axis magnetoresistive sensors and installing them on six surfaces of a non-metallic hexahedron tooling block; fixing the tooling block on the three-dimensional coil At the center position, put a magnetic shielding barrel and end cover on the outside of the three-dimensional coil; repeatedly provide excitation current and power-off process for the Z-direction coil, and obtain a uniform magnetic field of the Z-direction coil according to the magnetic field values of the first and second magnetoresistive sensors Repetitively provide excitation current and power-off process for the X-direction coil, calculate and obtain the magnetic field uniformity of the X-direction coil according to the magnetic field values of the third and fourth magnetoresistive sensors; repeatedly provide excitation current and power-off process for the Y-direction coil, The magnetic field uniformity of the coil in the Y direction is obtained through calculation according to the magnetic field values of the fifth and sixth magnetoresistive sensors. The technical scheme of the invention is applied to solve the technical problem in the prior art that the test of the uniformity of the coil magnetic field in a small closed space cannot be realized.

Description

Three-dimensional coil magnetic field uniformity test method and system

technical field

The invention relates to the technical field of magnetic field testing, in particular to a method and system for testing the uniformity of a three-dimensional coil magnetic field.

Background technique

The three-dimensional coil is the main actuator for magnetic field control in the MRI gyroscope. The orthogonality and uniformity of the generated magnetic field directly affect the precision control ability of the nuclear spin ensemble, and it is one of the core components that determine the accuracy of the gyroscope. As the size of the NMR gyroscope continues to decrease, the volume of the three-dimensional coil under the boundary conditions of magnetic shielding also decreases. At present, there is no way to test the uniformity of the coil magnetic field in a small enclosed space. Under the above requirements, it is necessary to study a The method for testing the uniformity of the magnetic field of the miniature coil makes it possible to test the uniformity of the magnetic field of the coil under the condition of closed magnetic shielding.

Contents of the invention

The invention provides a method and system for testing the uniformity of the magnetic field of a three-dimensional coil, which can solve the technical problem in the prior art that the test of the uniformity of the magnetic field of the coil in a small closed space cannot be realized.

According to one aspect of the present invention, a method for testing the uniformity of a three-dimensional coil magnetic field is provided. The method for testing the uniformity of a three-dimensional coil magnetic field includes: designing a non-metallic hexahedron tooling block of the same size as the magnetic field area of the tested coil; selecting six three-axis magnetic For the resistance sensor, the first magnetoresistive sensor is arranged on the center position of the first surface of the non-metallic hexahedron tooling block along the Z direction of the coil magnetic field, and the second magnetoresistive sensor is arranged on the second surface of the non-metallic hexahedron tooling block along the Z direction of the coil magnetic field. The center position of the surface, the first surface and the second surface are arranged in parallel; the third magnetoresistive sensor is arranged on the center position of the third surface of the non-metallic hexahedron tooling block along the X direction of the coil magnetic field, and the fourth magnetoresistive sensor is arranged along the coil magnetic field The X direction is set at the center of the fourth side of the non-metallic hexahedron tooling block, the third side and the fourth side are set parallel to and perpendicular to the first side; the fifth magnetoresistive sensor is set on the non-metallic hexahedron tooling along the Y direction of the coil magnetic field At the center position of the fifth surface of the block, the sixth magnetoresistive sensor is arranged in the center position of the sixth surface of the non-metallic hexahedron tooling block along the Y direction of the coil magnetic field, and the fifth surface and the sixth surface are arranged parallel to and perpendicular to the first surface and the third surface; fix the non-metallic hexahedron tooling block at the center of the three-dimensional coil, put a magnetic shielding bucket and end cover on the outside of the three-dimensional coil; provide excitation current for the coil in the Z direction and maintain the first set Power on and keep the first set time, repeat the above process for the first set number of times, calculate and obtain the magnetic field uniformity of the coil in the Z direction according to the magnetic field values of the first magnetoresistive sensor and the second magnetoresistive sensor; provide excitation for the coil in the X direction The current is kept for the second set time, and the power is turned off and kept for the second set time. After repeating the above process for the second set number of times, the magnetic field values of the third magnetoresistive sensor and the fourth magnetoresistive sensor are used to calculate and obtain the position of the X-direction coil. Magnetic field uniformity: provide excitation current for the coil in the Y direction and keep the third set time, power off and keep the third set time, repeat the above process for the third set number of times, according to the fifth magnetic resistance sensor and the sixth magnetic resistance The magnetic field value of the sensor is calculated to obtain the uniformity of the magnetic field of the coil in the Y direction.

Further, provide excitation current for the coil in the Z direction and maintain the first set time length, power off and maintain the first set time length, repeat the above process for the first set number of times, according to the first magnetoresistive sensor and the second magnetoresistive sensor The calculation of the magnetic field value to obtain the uniformity of the magnetic field of the coil in the Z direction specifically includes: in the first period, provide the excitation current for the coil in the Z direction and maintain the first set time length, power off and maintain the first set time length, and sequentially collect the first According to the N1 magnetic field data of the first magnetoresistive sensor in the period, the first period average score of the first magnetoresistive sensor is calculated according to the N1 magnetic field data of the first magnetoresistive sensor; the second magnetic field in the first period is sequentially collected The B1 magnetic field data of the resistive sensor is calculated according to the B1 magnetic field data of the second magnetoresistive sensor to obtain the average score of the first cycle of the second magnetoresistive sensor; in the second cycle, an excitation current is provided for the coil in the Z direction and the first cycle is maintained. A set time length, power off and maintain the first set time length, sequentially collect N2 magnetic field data of the first magnetoresistive sensor in the second cycle, and calculate and obtain the first magnetic resistance according to the N2 magnetic field data of the first magnetoresistive sensor The second cycle average score of the sensor; sequentially collect B2 magnetic field data of the second magnetoresistive sensor in the second cycle, and calculate and obtain the second cycle average of the second magnetoresistive sensor according to the B2 magnetic field data of the second magnetoresistive sensor Score: Repeat the above process to find the average score of the third cycle of the first magnetoresistive sensor, the average score of the fourth cycle ... the average score of the first set number of cycles, according to the first cycle of the first magnetoresistive sensor Average score, average score of the second cycle... Calculate the average score of the first set number of cycles to obtain the average value of the first magnetoresistive sensor; sequentially calculate the average score of the third cycle and the fourth cycle of the second magnetoresistive sensor Average score...the average score of the first set number of times, according to the average score of the first cycle of the second magnetoresistive sensor, the average score of the second cycle...the average score of the first set number of times to calculate and obtain the second reluctance The average value of the sensor; the uniformity of the magnetic field of the coil in the Z direction is obtained through calculation based on the average value of the first magnetoresistive sensor and the average value of the second magnetoresistive sensor.

Further, the uniformity of the magnetic field of the coil in the Z direction can be obtained according to Z _magnetism =Q1Q-1Q2 or Q1Q-2Q2, where Q1 is the average value of the first magnetoresistive sensor, and Q2 is the average value of the second magnetoresistive sensor.

Further, provide excitation current for the X-direction coil and maintain the second set time length, power off and maintain the second set time length, repeat the above process for the second set number of times, according to the third magnetoresistive sensor and the fourth magnetoresistive sensor The calculation of the magnetic field value to obtain the uniformity of the magnetic field of the X-direction coil specifically includes: in the first cycle, supply the excitation current to the X-direction coil and maintain the second set time length, power off and maintain the second set time length, and sequentially collect the first The M1 magnetic field data of the third magnetoresistive sensor in the period is calculated according to the M1 magnetic field data of the third magnetoresistive sensor to obtain the average score of the first period of the third magnetoresistive sensor; the fourth magnetic field in the first period is sequentially collected The Z1 magnetic field data of the resistance sensor is calculated according to the Z1 magnetic field data of the fourth magnetoresistive sensor to obtain the average score of the first cycle of the fourth magnetoresistive sensor; in the second cycle, an excitation current is provided for the X direction coil and the first cycle is maintained. 2. Set the time length, power off and keep the second set time length, sequentially collect M2 magnetic field data of the third magnetoresistive sensor in the second cycle, and calculate and obtain the third magnetic resistance according to the M2 magnetic field data of the third magnetoresistive sensor The second cycle average score of the sensor; sequentially collect Z2 magnetic field data of the fourth magnetoresistive sensor in the second cycle, and calculate and obtain the second cycle average of the fourth magnetoresistive sensor according to the Z2 magnetic field data of the fourth magnetoresistive sensor Score: Repeat the above process to find the average score of the third period of the third magnetoresistive sensor, the average score of the fourth period ... the average score of the second set number of times, according to the first period of the third magnetoresistive sensor Average score, average score of the second cycle... Calculate the average score of the second set number of cycles to obtain the average value of the third magnetoresistive sensor; sequentially calculate the average score of the third cycle and the fourth cycle of the fourth magnetoresistive sensor Average score... the average score of the second set number of cycles, according to the average score of the first cycle of the fourth magnetoresistive sensor, the average score of the second cycle... the average score of the second set number of cycles to obtain the fourth reluctance sensor The average value of the sensors; the uniformity of the magnetic field of the X-direction coil is obtained through calculation based on the average value of the third magnetoresistive sensor and the average value of the fourth magnetoresistive sensor.

Further, the uniformity of the magnetic field of the X-direction coil can be based on or /> To obtain, wherein, Q3 is the average value of the third magnetoresistive sensor, Q4 is the average value of the fourth magnetoresistive sensor.

Further, provide excitation current for the coil in the Y direction and maintain the third set time length, power off and maintain the third set time length, repeat the above process for the third set number of times, according to the fifth magnetoresistive sensor and the sixth magnetoresistive sensor The calculation of the magnetic field value to obtain the uniformity of the magnetic field of the coil in the Y direction specifically includes: in the first period, provide an excitation current for the coil in the Y direction and maintain the third set time length, power off and maintain the third set time length, and sequentially collect the first The D1 magnetic field data of the fifth magnetoresistive sensor in the period is calculated according to the D1 magnetic field data of the fifth magnetoresistive sensor to obtain the average score of the first period of the fifth magnetoresistive sensor; the sixth magnetic field in the first period is sequentially collected The F1 magnetic field data of the resistance sensor is calculated according to the F1 magnetic field data of the sixth magnetoresistive sensor to obtain the average score of the first cycle of the sixth magnetoresistive sensor; in the second cycle, an excitation current is provided for the coil in the Y direction and the first cycle is maintained. Three set time lengths, power off and keep the third set time length, sequentially collect D2 magnetic field data of the fifth magnetoresistive sensor in the second cycle, and calculate and obtain the fifth magnetic resistance according to the D2 magnetic field data of the fifth magnetoresistive sensor The second cycle average score of the sensor; sequentially collect F2 magnetic field data of the sixth magnetoresistive sensor in the second cycle, and calculate and obtain the second cycle average of the sixth magnetoresistive sensor according to the F2 magnetic field data of the sixth magnetoresistive sensor Score: Repeat the above process to find the average score of the third cycle of the fifth magnetoresistive sensor, the average score of the fourth cycle ... the average score of the third cycle of the set number of times, according to the first cycle of the fifth magnetoresistive sensor Average score, average score of the second cycle... Calculate the average score of the third set number of cycles to obtain the average value of the fifth magnetoresistive sensor; sequentially calculate the average score of the third cycle and the fourth cycle of the sixth magnetoresistive sensor Average score... the average score of the third set number of times, according to the average score of the first cycle of the sixth magnetoresistive sensor, the average score of the second cycle ... the average score of the third set number of cycles to obtain the sixth reluctance sensor The average value of the sensor; the uniformity of the magnetic field of the coil in the Y direction is obtained through calculation based on the average value of the fifth magnetoresistive sensor and the average value of the sixth magnetoresistive sensor.

Further, the uniformity of the magnetic field of the coil in the Y direction can be based on or /> to obtain, wherein, Q5 is the average value of the fifth magnetoresistive sensor, and Q6 is the average value of the sixth magnetoresistive sensor.

Further, before setting the six three-axis magnetoresistive sensors on the non-metallic hexahedron tooling block, the three-dimensional coil magnetic field uniformity test method also includes: welding the six three-axis magnetoresistive sensors on the six flexible PCB boards one by one ; Any three-axis magnetoresistive sensor is fixedly arranged on the non-metallic hexahedron tooling block through its corresponding flexible PCB board.

According to yet another aspect of the present invention, a three-dimensional coil magnetic field uniformity testing system is provided. The three-dimensional coil magnetic field uniformity testing system uses the above-mentioned three-dimensional coil magnetic field uniformity testing method to perform coil magnetic testing uniformity testing.

Furthermore, the three-dimensional coil magnetic field uniformity test system includes six three-axis magnetoresistive sensors, a non-metallic hexahedron tooling block, a power supply module, a controller and a processor, and the six three-axis magnetoresistive sensors are installed on the non-metallic hexahedral tooling one by one. On the six sides of the block, six three-axis magneto-resistive sensors are used to detect the magnetic field data of the three-dimensional coil, the power supply module is used to supply power to the three-dimensional coil, the controller is used to control the power supply time of the power supply module, and the processor is used to Calculate the magnetic field uniformity of the coil in the Z direction by calculating the magnetic field value of the sensor and the second magnetoresistive sensor, obtain the magnetic field uniformity of the coil in the X direction according to the magnetic field value calculation of the third magnetoresistive sensor and the fourth magnetoresistive sensor, and obtain the magnetic field uniformity of the coil in the X direction according to the fifth magnetoresistive sensor The magnetic field value calculation of the sensor and the sixth magnetoresistive sensor obtains the uniformity of the magnetic field of the coil in the Y direction.

Applying the technical scheme of the present invention, a method for testing the uniformity of the magnetic field of a three-dimensional coil is provided. The method selects a suitable three-axis magnetoresistance sensor, fixes the three-axis magnetoresistance sensor on a non-metallic hexahedron tooling block, and puts it into a magnetic shield The center of the coil; apply a square wave magnetic field to the coil, and measure the magnetic field at the position of the two magnetoresistive sensors in the same direction; the magnetic field uniformity index of the coil can be obtained by calculating the magnetic fields of the two magnetoresistive sensors in the same direction. This method uses a small three-axis magnetoresistive sensor And the corresponding tooling etc. provide a good test method for the uniformity of the coil magnetic field under the condition of magnetic shielding and closure, and can realize the test of the uniformity of the coil magnetic field in a small closed space.

Description of drawings

The accompanying drawings are included to provide further understanding of the embodiments of the invention, and constitute a part of the specification, are used to illustrate the embodiments of the invention, and together with the description, explain the principle of the invention. Apparently, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

Fig. 1 shows a schematic diagram of the installation of a square tooling block and a three-axis magnetoresistive sensor provided according to a specific embodiment of the present invention;

Fig. 2 shows a schematic structural diagram of a three-dimensional coil magnetic field uniformity testing system provided according to a specific embodiment of the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. The first magnetoresistance sensor; 20. The second magnetoresistance sensor; 30. The third magnetoresistance sensor; 40. The fourth magnetoresistance sensor; 50. The fifth magnetoresistance sensor; 60. The sixth magnetoresistance sensor; 70. Non-metallic hexahedron tooling block; 80, three-dimensional coil; 90, magnetic shielding bucket; 100, end cover.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

As shown in Figures 1 and 2, a method for testing the uniformity of a three-dimensional coil magnetic field is provided according to a specific embodiment of the present invention. The method for testing the uniformity of a three-dimensional coil magnetic field includes: designing a non-metallic Hexahedron tooling block 70; select six three-axis magnetoresistive sensors, set the first magnetoresistive sensor 10 at the center of the first surface of the non-metallic hexahedron tooling block 70 along the coil magnetic field Z direction, and place the second magnetoresistive sensor 20 along the line The coil magnetic field Z direction is arranged at the center position of the second surface of the non-metallic hexahedron tooling block 70, and the first surface and the second surface are arranged in parallel; the third magnetoresistive sensor 30 is arranged on the non-metallic hexahedron tooling block 70 along the coil magnetic field X direction The center position of the third surface of the fourth magnetoresistive sensor 40 is arranged on the center position of the fourth surface of the non-metallic hexahedron tooling block 70 along the coil magnetic field X direction, and the third surface and the fourth surface are arranged in parallel and perpendicular to the first Surface; the fifth magnetic resistance sensor 50 is arranged on the center position of the fifth surface of the non-metallic hexahedron tooling block 70 along the coil magnetic field Y direction, and the sixth magnetic resistance sensor 60 is arranged on the non-metallic hexahedron tooling block 70 along the coil magnetic field Y direction The center position of the sixth face, the fifth face and the sixth face are arranged in parallel and perpendicular to the first face and the third face; the non-metallic hexahedron tooling block 70 is fixed on the center position of the three-dimensional coil 80, and the three-dimensional coil 80 Put the magnetic shielding barrel 90 and the end cap 100 on the outside; provide the excitation current for the coil in the Z direction and keep the first set time, power off and keep the first set time, repeat the above process for the first set number of times, according to the first Calculate the magnetic field value of the magnetoresistive sensor 10 and the second magnetoresistive sensor 20 to obtain the uniformity of the magnetic field of the coil in the Z direction; provide the excitation current for the coil in the X direction and keep the second set time length, power off and keep the second set time length, repeat After the second set number of times of the above process, calculate and obtain the magnetic field uniformity of the X-direction coil according to the magnetic field values of the third magnetoresistive sensor 30 and the fourth magnetoresistive sensor 40; provide excitation current for the Y-direction coil and maintain the third set duration , power off and keep for a third set time length, repeat the above process for a third set number of times, calculate and obtain the magnetic field uniformity of the Y-direction coil according to the magnetic field values of the fifth magnetoresistive sensor 50 and the sixth magnetoresistive sensor 60 .

Using this configuration method, a method for testing the uniformity of the magnetic field of a three-dimensional coil is provided. This method selects a suitable three-axis magnetoresistive sensor, fixes the three-axis magnetoresistive sensor on a non-metallic hexahedron tooling block, and puts it into the magnetic shielding coil. Center; apply a square wave magnetic field to the coil, and measure the magnetic field at the position of two magnetoresistive sensors in the same direction; the magnetic field uniformity index of the coil can be obtained by calculating the magnetic fields of the two magnetoresistive sensors in the same direction. This method uses small three-axis magnetoresistive sensors and The corresponding tooling provides good testing means for the uniformity of the coil magnetic field under the condition of magnetic shielding and closure, and can realize the test of the uniformity of the coil magnetic field in a small closed space.

Specifically, in the present invention, in order to realize the uniformity test of the three-dimensional coil magnetic field, it is first necessary to design a non-metallic hexahedron tooling block 70 having the same size as the tested coil magnetic field area. According to the actual situation, a non-metallic hexahedron tooling block 70 with a suitable structural shape, such as a cube or a cuboid, can be selected.

Further, after the non-metallic hexahedron tooling block 70 is selected, six three-axis magnetoresistive sensors can be selected, and the first magnetoresistive sensor 10 is arranged on the first surface of the non-metallic hexahedron tooling block 70 along the coil magnetic field Z direction. At the center position, the second magnetoresistive sensor 20 is arranged on the center position of the second surface of the non-metallic hexahedron tooling block 70 along the coil magnetic field Z direction, and the first surface and the second surface are arranged in parallel; the third magnetoresistive sensor 30 is arranged along the coil The X direction of the magnetic field is arranged on the central position of the third surface of the non-metallic hexahedron tooling block 70, and the fourth magnetoresistive sensor 40 is arranged on the central position of the fourth surface of the non-metallic hexahedron tooling block 70 along the X direction of the coil magnetic field. Set parallel to the fourth surface and perpendicular to the first surface; the fifth magnetoresistive sensor 50 is arranged on the center position of the fifth surface of the non-metallic hexahedron tooling block 70 along the Y direction of the coil magnetic field, and the sixth magnetoresistive sensor 60 is arranged along the coil The Y direction of the magnetic field is set at the center position of the sixth face of the non-metallic hexahedron tooling block 70, the fifth and sixth faces are arranged in parallel and are perpendicular to the first and third faces at the same time; the non-metallic hexahedron tooling block 70 is fixed in three dimensions At the central position of the coil 80 , a magnetic shielding bucket 90 and an end cover 100 are put on the outside of the three-dimensional coil 80 .

As a specific embodiment of the present invention, a suitable small-sized three-axis magnetoresistive sensor is selected, the size of any three-axis magnetoresistive sensor is less than or equal to 1.5mm*1.5mm, and the magnetic field test resolution of any three-axis magnetoresistive sensor Both are of nT magnitude. In addition, in order to facilitate the reliable installation of the three-axis magnetoresistive sensor on the non-metallic hexahedron tooling block, before setting the six three-axis magnetoresistive sensors on the non-metallic hexahedron tooling block 70, the method for testing the uniformity of the three-dimensional coil magnetic field also includes: The six three-axis magnetoresistive sensors are welded on the six flexible PCBs one by one; any three-axis magnetoresistive sensor is fixedly arranged on the non-metallic hexahedron tooling block 70 through its corresponding flexible PCB. The non-metallic hexahedron tooling block is fixed at the center of the coil through the test tooling, the magnetic shielding barrel 90 and the end cover 100 are placed on the outside of the coil, and the flexible PCB of the three-axis magnetoresistive sensor is drawn out from the outlet hole of the magnetic shielding end cover 100 .

Further, after the installation of the three-axis magnetoresistive sensor on the tooling block is completed, the test of the uniformity of the magnetic field can be carried out. Specifically, the excitation current is provided for the coil in the Z direction and maintained for the first set time, and the power is turned off and maintained. The first set duration, after repeating the above-mentioned process for the first set number of times, calculate and obtain the magnetic field uniformity of the coil in the Z direction according to the magnetic field values of the first magnetoresistive sensor 10 and the second magnetoresistive sensor 20; provide excitation current for the coil in the X direction And keep the second set time length, power off and keep the second set time length, repeat the above process for the second set number of times, calculate and obtain the X direction coil according to the magnetic field values of the third magnetoresistive sensor 30 and the fourth magnetoresistive sensor 40 The uniformity of the magnetic field; provide excitation current for the Y direction coil and keep the third set time length, power off and keep the third set time length, after repeating the above process for the third set times, according to the fifth reluctance sensor 50 and the sixth The calculation of the magnetic field value of the magnetoresistive sensor 60 obtains the uniformity of the magnetic field of the coil in the Y direction.

In the present invention, obtaining the magnetic field uniformity of the coil in the Z direction specifically includes: within the first cycle, providing an excitation current for the coil in the Z direction and maintaining the first set time length, powering off and maintaining the first set time length, and sequentially collecting the first The N1 magnetic field data of the first magnetoresistive sensor 10 within one cycle is calculated according to the N1 magnetic field data of the first magnetoresistive sensor 10 to obtain the first cycle average score of the first magnetoresistive sensor 10; The B1 magnetic field data of the second magnetoresistive sensor 20 is calculated according to the B1 magnetic field data of the second magnetoresistive sensor 20 to obtain the first cycle average score of the second magnetoresistive sensor 20; in the second cycle, it is the Z direction The coil provides excitation current and maintains the first set time length, power off and maintains the first set time length, and sequentially collects N2 magnetic field data of the first magnetoresistive sensor 10 in the second period, according to the N2 magnetic field data of the first magnetoresistive sensor 10 A magnetic field data calculation obtains the second cycle average score of the first magnetoresistive sensor 10; B2 magnetic field data of the second magnetoresistive sensor 20 in the second cycle are collected successively, according to the B2 magnetic field data of the second magnetoresistive sensor 20 Calculate and obtain the average score of the second period of the second magnetoresistive sensor 20; repeat the above process, and successively obtain the average score of the third period of the first magnetoresistive sensor 10, the average score of the fourth period...the first set number of cycles Average score, according to the first cycle average score of the first magnetoresistive sensor 10, the second cycle average score ... the first set number of cycle average scores to calculate and obtain the average value of the first magnetoresistive sensor 10; The third cycle average score of the second magnetoresistive sensor 20, the fourth cycle average score ... the first set number of cycle average scores, according to the first cycle average score of the second magnetoresistive sensor 20, the second cycle average score Score... The average score of the first set number of cycles is calculated to obtain the average value of the second magnetoresistive sensor 20; according to the average value of the first magnetoresistive sensor 10 and the average value of the second magnetoresistive sensor 20, the value of the Z-direction coil is obtained. Magnetic field uniformity. Among them, the uniformity of the magnetic field of the coil in the Z direction can be based on or /> to obtain, wherein, Q1 is the average value of the first magnetoresistive sensor 10, and Q2 is the average value of the second magnetoresistive sensor 20.

In the present invention, obtaining the magnetic field uniformity of the X-direction coil specifically includes: within the first cycle, providing an excitation current to the X-direction coil and maintaining the second set time length, powering off and maintaining the second set time length, and sequentially collecting the first The M1 magnetic field data of the third magnetoresistive sensor 30 within one cycle, according to the M1 magnetic field data of the third magnetoresistive sensor 30, calculate and obtain the first cycle average score of the third magnetoresistive sensor 30; The Z1 magnetic field data of the fourth magnetoresistive sensor 40, according to the Z1 magnetic field data of the fourth magnetoresistive sensor 40, calculate and obtain the first cycle average score of the fourth magnetoresistive sensor 40; in the second cycle, it is the X direction The coil provides an excitation current and maintains the second set duration, powers off and maintains the second set duration, and sequentially collects M2 magnetic field data of the third magnetoresistive sensor 30 in the second cycle, according to the M2 of the third magnetoresistive sensor 30 A magnetic field data calculation obtains the second cycle average score of the third magnetoresistive sensor 30; sequentially collect Z2 magnetic field data of the fourth magnetoresistive sensor 40 in the second cycle, according to the Z2 magnetic field data of the fourth magnetoresistive sensor 40 Calculate and obtain the average score of the second cycle of the fourth magnetoresistive sensor 40; repeat the above process, and successively obtain the average score of the third cycle of the third magnetoresistive sensor 30, the average score of the fourth cycle ... the second set number of cycles Average score, according to the first cycle average score of the third magnetoresistive sensor 30, the second cycle average score ... the second set number of cycle average scores to calculate and obtain the average value of the third magnetoresistive sensor 30; The third cycle average score of the fourth magnetoresistive sensor 40, the fourth cycle average score ... the second set number of cycle average scores, according to the first cycle average score of the fourth magnetoresistive sensor 40, the second cycle average score Score... The second set number of cycle average score is calculated to obtain the average value of the fourth magnetoresistive sensor 40; according to the average value of the third magnetoresistive sensor 30 and the average value of the fourth magnetoresistive sensor 40, the value of the X-direction coil is obtained. Magnetic field uniformity. Among them, the uniformity of the magnetic field of the X-direction coil can be based on or /> to obtain, wherein, Q3 is the average value of the third magnetoresistive sensor 30, and Q4 is the average value of the fourth magnetoresistive sensor 40.

In the present invention, obtaining the uniformity of the magnetic field of the coil in the Y direction specifically includes: within the first period, providing an excitation current for the coil in the Y direction and maintaining the third set time length, powering off and maintaining the third set time length, and sequentially collecting the first The D1 magnetic field data of the fifth magnetoresistive sensor 50 within one cycle is calculated according to the D1 magnetic field data of the fifth magnetoresistive sensor 50 to obtain the first cycle average score of the fifth magnetoresistive sensor 50; The F1 magnetic field data of the sixth magnetoresistive sensor 60, according to the F1 magnetic field data of the sixth magnetoresistive sensor 60, the first cycle average score of the sixth magnetoresistive sensor 60 is obtained; in the second cycle, it is the Y direction The coil provides excitation current and maintains the third set duration, powers off and maintains the third set duration, and sequentially collects D2 magnetic field data of the fifth magnetoresistive sensor 50 in the second cycle, according to D2 of the fifth magnetoresistive sensor 50 A magnetic field data calculation obtains the second cycle average score of the fifth magnetoresistive sensor 50; sequentially collect F2 magnetic field data of the sixth magnetoresistive sensor 60 in the second cycle, according to the F2 magnetic field data of the sixth magnetoresistive sensor 60 Calculate and obtain the average score of the second period of the sixth magnetoresistive sensor 60; repeat the above process, and successively obtain the average score of the third period of the fifth magnetoresistive sensor 50, the average score of the fourth period ... the third set number of cycles Average score, according to the first cycle average score of the fifth magnetoresistive sensor 50, the second cycle average score ... the third set number of cycle average scores to calculate and obtain the average value of the fifth magnetoresistive sensor 50; The third cycle average score of the sixth magnetoresistive sensor 60, the fourth cycle average score ... the third cycle average score of the set number of times, according to the first cycle average score and the second cycle average score of the sixth magnetoresistive sensor 60 Score... the third set number of cycle average score is calculated to obtain the average value of the sixth magnetoresistive sensor 60; according to the average value of the fifth magnetoresistive sensor 50 and the average value of the sixth magnetoresistive sensor 60, the value of the Y direction coil is obtained Magnetic field uniformity. Among them, the uniformity of the magnetic field of the Y direction coil can be based on or /> to obtain, wherein, Q5 is the average value of the fifth magnetoresistive sensor 50, and Q6 is the average value of the sixth magnetoresistive sensor 60.

According to another aspect of the present invention, a three-dimensional coil magnetic field uniformity testing system is provided. The three-dimensional coil magnetic field uniformity testing system uses the above-mentioned three-dimensional coil magnetic field uniformity testing method to perform a coil magnetic testing uniformity test. Specifically, in the present invention, the three-dimensional coil magnetic field uniformity test system includes six three-axis magnetoresistive sensors, a non-metallic hexahedron tooling block, a power supply module, a controller and a processor, and the six three-axis magnetoresistive sensors are installed one by one On the six surfaces of the non-metallic hexahedron tooling block, six three-axis magnetoresistive sensors are used to detect the magnetic field data of the three-dimensional coil, the power supply module is used to supply power to the three-dimensional coil, and the controller is used to control the power supply time of the power supply module. The magnetic field values of the first magnetoresistive sensor 10 and the second magnetoresistive sensor 20 are calculated to obtain the uniformity of the magnetic field of the Z-direction coil, and the magnetic field of the X-direction coil is obtained according to the magnetic field values of the third magnetoresistive sensor 30 and the fourth magnetoresistive sensor 40. The uniformity and the magnetic field uniformity of the coil in the Y direction are calculated and obtained according to the magnetic field values of the fifth magnetoresistive sensor 50 and the sixth magnetoresistive sensor 60 .

In order to further understand the present invention, the method for testing the uniformity of the three-dimensional coil magnetic field provided by the present invention will be described in detail below with reference to FIG. 1 and FIG. 2 .

As shown in FIG. 1 and FIG. 2 , according to a specific embodiment of the present invention, a method for testing the uniformity of a three-dimensional coil magnetic field is provided, and the method for testing the uniformity of a three-dimensional coil magnetic field specifically includes the following steps.

First of all, select a suitable small three-axis magnetoresistive sensor, the required size is not larger than 1.5mm*1.5mm, the resolution of the magnetic field test is in the order of nT, and the six three-axis magnetoresistive sensors are respectively soldered to six flexible PCBs. A non-metallic cube tooling block of the same size as the magnetic field area of the measuring coil.

Then, fix the 6 magnetoresistive sensors welded on the flexible PCB to the centers of the 6 faces of the tooling block, fix the non-metallic tooling block at the center of the coil through the test tooling, and put the magnetic shielding barrel and end cover on the outside of the coil , The flexible PCB of the magnetoresistive sensor is drawn out from the outlet hole of the magnetic shield end cover.

Finally, provide excitation current for the coil in the Z direction through the current board, and then turn off the power, and the coil will generate a square wave magnetic field. Specifically, use the PXI4145 board to pass a certain current to the Z coil for 2s, and then turn off the power for 2s to form a square wave. Magnetic field: Use the data acquisition and processing program of the processor to collect the magnetic field values of the first magnetoresistive sensor and the second magnetoresistive sensor in the Z direction through the USB port, and collect 100 first magnetoresistive sensors within 4s of the first cycle The magnetic field value of the first magnetoresistive sensor of the 100 points is added and divided by 100 to obtain the average score of the first cycle of the first magnetoresistive sensor; in the 4s time of the first cycle, collect For 100 magnetic field values of the second magnetoresistive sensors, the magnetic field values of the 100 points of the second magnetoresistive sensors are added and divided by 100 to obtain the first cycle average score of the second magnetoresistive sensors.

Repeat the above-mentioned power-on and power-off process 100 times, and sequentially obtain the average score of the second cycle, the average score of the third cycle of the first magnetoresistive sensor 10 ... the average score of the first set number of cycles, according to the average score of the first magnetoresistive sensor 10 The average score of the first cycle, the average score of the second cycle... the average score of the first set number of cycles is calculated to obtain the average value of the first magnetoresistive sensor 10, specifically, the first cycle of the first magnetoresistive sensor 10 The average score, the average score of the second cycle...the average score of the first set number of cycles is added and divided by 100 to obtain the average value of the first magnetoresistive sensor 10 . Similarly, the second cycle average score, the third cycle average score...the first set times cycle average score of the second magnetoresistive sensor 20 is obtained in sequence, and the first cycle average score of the second magnetoresistive sensor 20 value, the second cycle average score ... the first set number of cycle average score calculations to obtain the average value of the second magnetoresistive sensor 20, specifically, the first cycle average score of the second magnetoresistive sensor 20, the second Periodic average score... The average value of the second magnetoresistive sensor 20 can be obtained by adding the first set number of period average scores and dividing by 100. Finally, the magnetic field uniformity of the coil in the Z direction is calculated and obtained according to the average value of the first magnetoresistive sensor 10 and the average value of the second magnetoresistive sensor 20 . The uniformity of the magnetic field of the coil in the Z direction can be based on or /> to obtain, wherein, Q1 is the average value of the first magnetoresistive sensor 10, and Q2 is the average value of the second magnetoresistive sensor 20.

The X coil and the Y coil are respectively supplied with excitation current by the board, and the above steps are repeated to realize the test of the uniformity of the magnetic field of the coil in the X and Y directions in sequence.

In summary, the present invention provides a method for testing the uniformity of the magnetic field of a three-dimensional coil, which provides a good test method for the uniformity of the magnetic field of the NMR gyro coil through a small three-axis magnetoresistive sensor and a test tool, and can be used in a micro-sized The measurement of the uniformity of the magnetic field of the coil is realized in the closed space, which provides the basis for the research of the nuclear magnetic resonance gyroscope.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of the present invention.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a three-dimensional coil magnetic field uniformity testing method, is characterized in that, described three-dimensional coil magnetic field uniformity testing method comprises: Designing a non-metallic hexahedron tooling block (70) of the same size as the measured coil magnetic field area; Select six three-axis magnetoresistive sensors, the first magnetoresistive sensor (10) is arranged on the center position of the first face of the non-metallic hexahedron tooling block (70) along the coil magnetic field Z direction, and the second magnetoresistive sensor ( 20) be arranged on the center position of the second surface of the non-metallic hexahedron tooling block (70) along the coil magnetic field Z direction, the first surface and the second surface are arranged in parallel; the third magnetoresistive sensor (30) The center position of the third surface of the non-metallic hexahedron tooling block (70) is arranged along the coil magnetic field X direction, and the fourth magnetoresistive sensor (40) is arranged on the non-metallic hexahedron tooling block (70) along the coil magnetic field X direction ), the third surface and the fourth surface are arranged in parallel and perpendicular to the first surface; the fifth magnetoresistive sensor (50) is arranged on the non- At the center position of the fifth face of the metal hexahedron tooling block (70), the sixth magnetoresistive sensor (60) is arranged on the center position of the sixth face of the non-metallic hexahedron tooling block (70) along the coil magnetic field Y direction, so The fifth surface and the sixth surface are arranged parallel to and perpendicular to the first surface and the third surface; Fixing the non-metallic hexahedron tooling block (70) at the central position of the three-dimensional coil (80), and putting a magnetic shielding barrel (90) and an end cover (100) on the outside of the three-dimensional coil (80); Provide excitation current for the Z-direction coil and maintain the first set time length, power off and maintain the first set time length, repeat the above process for the first set number of times, according to the first reluctance sensor (10) and the first set time The magnetic field value calculation of two reluctance sensors (20) obtains the uniformity of the magnetic field of the coil in the Z direction; provides the excitation current for the coil in the X direction and maintains the second set duration, powers off and maintains the second set duration, repeats the above process for the second After the number of times is set, calculate and obtain the magnetic field uniformity of the X-direction coil according to the magnetic field values of the third reluctance sensor (30) and the fourth reluctance sensor (40); provide excitation current for the Y-direction coil and maintain the first Three set duration, power off and keep the third set duration, after repeating the above process for the third set times, according to the magnetic field values of the fifth magnetoresistive sensor (50) and the sixth magnetoresistive sensor (60) Calculate and obtain the magnetic field uniformity of the coil in the Y direction. 2. The three-dimensional coil magnetic field uniformity testing method according to claim 1, characterized in that, providing excitation current for the Z direction coil and maintaining the first set duration, powering off and maintaining the first set duration, repeating the above-mentioned process for the first After a set number of times, calculating and obtaining the magnetic field uniformity of the Z-direction coil according to the magnetic field values of the first magnetoresistive sensor (10) and the second magnetoresistive sensor (20) specifically includes: In the first cycle, provide excitation current for the Z-direction coil and maintain the first set time length, power off and maintain the first set time length, and sequentially collect the first magnetoresistive sensor (10) in the first cycle According to the N1 magnetic field data of the first magnetoresistive sensor (10), the first period average score of the first magnetoresistive sensor (10) is calculated and obtained; The B1 magnetic field data of the second magnetoresistive sensor (20), according to the B1 magnetic field data of the second magnetoresistive sensor (20), the first cycle average of the second magnetoresistive sensor (20) is obtained. Score; In the second cycle, provide excitation current for the Z-direction coil and maintain the first set time length, power off and maintain the first set time length, and sequentially collect the first magnetoresistive sensor (10) in the second cycle According to the N2 magnetic field data of the first magnetoresistive sensor (10), the second cycle average score of the first magnetoresistive sensor (10) is calculated and obtained; The B2 magnetic field data of the second magnetoresistive sensor (20), according to the B2 magnetic field data calculation of the second magnetoresistive sensor (20), the second cycle average of the second magnetoresistive sensor (20) is obtained Score; Repeat the above process to obtain the third cycle average score, the fourth cycle average score of the first magnetoresistive sensor (10) ... the first set number of cycle average scores, according to the first magnetoresistive sensor (10) The first cycle average score, the second cycle average score ... the first set number of cycle average score calculations to obtain the average value of the first magnetoresistive sensor (10); sequentially obtain the second The average score of the third cycle of the magnetoresistive sensor (20), the average score of the fourth cycle ... the average score of the first set number of cycles, according to the average score of the first cycle of the second magnetoresistive sensor (20), The second cycle average score... the first set number of cycle average score calculations to obtain the average value of the second magnetoresistive sensor (20); The magnetic field uniformity of the Z-direction coil is obtained through calculation according to the average value of the first magnetoresistance sensor (10) and the average value of the second magnetoresistance sensor (20). 3. three-dimensional coil magnetic field uniformity test method according to claim 2, is characterized in that, the magnetic field uniformity of described Z direction coil can be according to or /> To obtain, wherein, Q1 is the average value of the first magnetoresistive sensor (10), and Q2 is the average value of the second magnetoresistive sensor (20). 4. The three-dimensional coil magnetic field uniformity testing method according to claim 1, characterized in that, provide excitation current for the X direction coil and keep the second set time length, power off and keep the second set time length, repeat the above-mentioned process for the first time After two set times, calculating and obtaining the magnetic field uniformity of the X-direction coil according to the magnetic field values of the third magnetoresistive sensor (30) and the fourth magnetoresistive sensor (40) specifically includes: In the first cycle, provide excitation current for the X-direction coil and maintain the second set time length, power off and maintain the second set time length, and sequentially collect the third magnetoresistive sensor (30) in the first cycle According to the M1 magnetic field data of the third magnetoresistive sensor (30), the first period average score of the third magnetoresistive sensor (30) is calculated and obtained; The Z1 magnetic field data of the fourth magnetoresistive sensor (40), according to the Z1 magnetic field data of the fourth magnetoresistive sensor (40), the first cycle average of the fourth magnetoresistive sensor (40) is obtained. Score; In the second cycle, provide excitation current for the X-direction coil and maintain the second set time length, power off and maintain the second set time length, and sequentially collect the third magnetoresistive sensor (30) in the second cycle According to the M2 magnetic field data of the third magnetoresistive sensor (30), the second period average score of the third magnetoresistive sensor (30) is calculated and obtained; The Z2 magnetic field data of the fourth magnetoresistive sensor (40), according to the Z2 magnetic field data of the fourth magnetoresistive sensor (40), the second cycle average of the fourth magnetoresistive sensor (40) is obtained. Score; Repeat the above process to obtain the third cycle average score, the fourth cycle average score of the third magnetoresistive sensor (30) ... the second set number of cycle average scores, according to the third cycle average score of the third magnetoresistive sensor (30). (30) first cycle average score value, second cycle average score value ... the second set number of cycle average score value calculations to obtain the average value of the third magnetoresistive sensor (30); sequentially obtain the fourth The third cycle average score of the magnetoresistive sensor (40), the fourth cycle average score ... the second set number of cycle average scores, according to the first cycle average score of the fourth magnetoresistive sensor (40), The second cycle average score... the second set number of cycle average score calculations to obtain the average value of the fourth magnetoresistive sensor (40); The magnetic field uniformity of the X-direction coil is obtained through calculation according to the average value of the third magnetoresistance sensor (30) and the average value of the fourth magnetoresistance sensor (40). 5. three-dimensional coil magnetic field uniformity test method according to claim 4, is characterized in that, the magnetic field uniformity of described X direction coil can be according to or /> to obtain, wherein, Q3 is the average value of the third magnetoresistive sensor (30), and Q4 is the average value of the fourth magnetoresistive sensor (40). 6. The three-dimensional coil magnetic field uniformity testing method according to claim 1, characterized in that, provide excitation current for the Y direction coil and keep the third set time length, power off and keep the third set time length, repeat the above-mentioned process for the first time After three set times, calculating and obtaining the magnetic field uniformity of the Y direction coil according to the magnetic field values of the fifth magnetoresistive sensor (50) and the sixth magnetoresistive sensor (60) specifically includes: In the first cycle, provide excitation current for the Y direction coil and maintain the third set time length, power off and maintain the third set time length, and sequentially collect the fifth magnetoresistive sensor (50) in the first cycle D1 magnetic field data, according to the D1 magnetic field data calculation of the fifth magnetic resistance sensor (50), the first cycle average score of the fifth magnetic resistance sensor (50) is obtained; The F1 magnetic field data of the sixth magnetic resistance sensor (60), according to the F1 magnetic field data of the sixth magnetic resistance sensor (60), the first cycle average of the sixth magnetic resistance sensor (60) is obtained. Score; In the second cycle, provide excitation current for the Y direction coil and keep the third set time length, power off and keep the third set time length, and sequentially collect the fifth magnetoresistive sensor (50) in the second cycle According to D2 magnetic field data of the fifth magnetic resistance sensor (50), the second period average score of the fifth magnetic resistance sensor (50) is calculated and obtained; The F2 magnetic field data of the sixth magnetoresistive sensor (60), according to the F2 magnetic field data of the sixth magnetoresistive sensor (60), the second cycle average of the sixth magnetoresistive sensor (60) is obtained. Score; Repeat the above process to obtain the third cycle average score, the fourth cycle average score...the third cycle average score of the fifth set times of the fifth magnetoresistive sensor (50) in turn, according to the fifth magnetoresistive sensor (50) first cycle average score value, second cycle average score value ... the third cycle average score value of the set number of times is calculated to obtain the average value of the fifth magnetoresistive sensor (50); The third cycle average score of the magnetoresistive sensor (60), the fourth cycle average score ... the third cycle average score of the set number of times, according to the first cycle average score of the sixth magnetoresistive sensor (60), The second cycle average score ... the third set number of cycle average score calculations to obtain the average value of the sixth magnetoresistive sensor (60); The magnetic field uniformity of the Y-direction coil is obtained through calculation according to the average value of the fifth magnetoresistance sensor (50) and the average value of the sixth magnetoresistance sensor (60). 7. three-dimensional coil magnetic field uniformity test method according to claim 6, is characterized in that, the magnetic field uniformity of described Y direction coil can be according to or /> to obtain, wherein, Q5 is the average value of the fifth magnetoresistive sensor (50), and Q6 is the average value of the sixth magnetoresistive sensor (60). 8. the three-dimensional coil magnetic field uniformity testing method according to claim 1, is characterized in that, before six three-axis magnetoresistive sensors are arranged on the non-metallic hexahedron tooling block (70), the three-dimensional coil magnetic field is uniform The performance testing method also includes: welding the six three-axis magnetoresistive sensors on six flexible PCB boards one by one; On the non-metallic hexahedron tooling block (70). 9. A three-dimensional coil magnetic field uniformity testing system, characterized in that, the three-dimensional coil magnetic field uniformity testing system uses the three-dimensional coil magnetic field uniformity testing method as claimed in any one of claims 1 to 8 for coil magnetic testing Uniformity test. 10. The three-dimensional coil magnetic field uniformity test system according to claim 9, characterized in that, the three-dimensional coil magnetic field uniformity test system comprises six three-axis magnetoresistive sensors, a non-metallic hexahedron tooling block (70), a power supply module , a controller and a processor, six three-axis magnetoresistive sensors are installed on the six faces of the non-metallic hexahedron tooling block (70) one by one, and the six three-axis magnetoresistive sensors are used to detect the magnetic field data of the three-dimensional coil , the power supply module is used to supply power to the three-dimensional coil, the controller is used to control the power supply time of the power supply module, and the processor is used to The magnetic field value calculation obtains the magnetic field uniformity of the Z direction coil, calculates and obtains the magnetic field uniformity of the X direction coil according to the magnetic field values of the third magnetoresistive sensor (30) and the fourth magnetoresistive sensor (40), and obtains the magnetic field uniformity of the X direction coil according to the fifth magnetoresistive sensor ( 50) and the magnetic field value calculation of the sixth magnetoresistive sensor (60) to obtain the magnetic field uniformity of the Y-direction coil.