CN216668702U - Liquid Pressure Sensing Inclinometer Based on Grating Fiber - Google Patents

Abstract

The utility model provides a grating fiber-based liquid pressure sensing inclinometer, which belongs to the technical field of inclination measurement and comprises a shell and a sensor group, wherein the shell is provided with a plurality of optical fibers; a solution cavity is arranged in the shell, and detection liquid is contained in the solution cavity; the sensor group is arranged on the side wall of the solution cavity and comprises a plurality of first pressure sensors below the liquid level and a plurality of second pressure sensors parallel and level to the liquid level, the first pressure sensors and the second pressure sensors are in pairwise symmetry and are uniformly distributed along the circumferential direction of the solution cavity, and the horizontal planes where the first pressure sensors are located are parallel to the horizontal planes where the second pressure sensors are located. According to the liquid pressure sensing inclinometer based on the grating optical fiber, provided by the utility model, by applying the principle of grating optical fiber pressure sensing and the flowing property of the detection liquid, the angle change of a horizontal plane is calculated through the pressure change of the pressure sensor at different heights in the detection liquid, so that the measurement accuracy is improved, and the liquid pressure sensing inclinometer is simple in structure and convenient to take and use.

Description

Liquid Pressure Sensing Inclinometer Based on Grating Fiber

technical field

The utility model belongs to the technical field of inclination measurement, and more particularly relates to a liquid pressure sensing inclinometer based on a grating optical fiber.

Background technique

Inclinometer is an instrument used to measure the apex angle and azimuth angle of engineering structures such as boreholes, foundation pits, foundations, walls and dam slopes.

Traditional inclinometers are usually resistance strain type, accelerometer type and electronic meter type, etc., which can measure the inclination and displacement of the object to be measured within the moving error range, and are widely used in engineering practice. However, traditional inclinometers use cables for signal transmission and have limited data transmission capabilities.

In order to ensure the transmission effect, the grating fiber inclinometer is mostly used at present. The grating fiber inclinometer uses the sensitivity of the wavelength of the optical signal to the strain and temperature to achieve accurate measurement of strain and temperature, and the grating fiber inclinometer can prevent electromagnetic interference. , Good durability and long transmission distance.

However, at present, the grating fiber inclinometer mostly uses the swing of the pendulum to make the symmetrically arranged grating generate corresponding strain, so as to measure the change of the wavelength reflected from the grating to calculate the inclination angle. However, the measurement and control accuracy of this grating fiber inclinometer is not high, or it can only obtain high precision when measuring small angles, and it has high environmental requirements and low reliability, and is not easy to integrate with other instruments.

Utility model content

The purpose of the utility model is to provide a liquid pressure sensing inclinometer based on grating optical fiber, which aims to improve the measurement accuracy.

In order to achieve the above purpose, the technical solution adopted by the present utility model is to provide a liquid pressure sensing inclinometer based on grating optical fiber, including:

a shell, the shell has a solution cavity, and the solution cavity contains the detection liquid;

A sensor group is arranged on the side wall of the solution chamber, the sensor group includes a plurality of first pressure sensors located below the liquid level and a plurality of second pressure sensors flush with the liquid level, a plurality of the first pressure sensors Both the pressure sensors and the plurality of second pressure sensors are symmetrical in pairs and evenly distributed along the circumference of the solution chamber, and the horizontal planes where the plurality of first pressure sensors are located are parallel to the horizontal planes where the plurality of second pressure sensors are located .

As another embodiment of the present application, the solution cavity is an inverted quadrangular pyramid cavity, and the bottom surface of the casing is parallel to the bottom surface of the solution cavity.

As another embodiment of the present application, the detection liquid volume in the solution chamber is two thirds of the total volume of the solution chamber.

As another embodiment of the present application, the number of the plurality of second pressure sensors and the plurality of first pressure sensors are the same, and are provided in a one-to-one correspondence.

As another embodiment of the present application, the plane where the two corresponding second pressure sensors and the first pressure sensor are located is perpendicular to the bottom surface of the housing.

As another embodiment of the present application, there are four first pressure sensors, and the four first pressure sensors are respectively disposed on four side walls of the solution chamber.

As another embodiment of the present application, the connection line between the second pressure sensor and the first pressure sensor on the same side wall is located on the longitudinal centerline of the side wall.

As another embodiment of the present application, the detection liquid is mercury liquid.

As another embodiment of the present application, an accommodating groove is formed on the upper end of the casing, a cover for sealing the accommodating groove is connected to the casing, and the accommodating groove and the cover enclose a space outside the casing. the solution chamber.

As another embodiment of the present application, the casing is a rectangular parallelepiped, and the casing has a plurality of attachment planes in the circumferential direction for contacting the surface to be measured.

The beneficial effects of the grating optical fiber-based liquid pressure sensing inclinometer provided by the present invention are: compared with the prior art, the grating optical fiber-based liquid pressure sensing inclinometer of the present invention uses the grating optical fiber pressure sensing inclinometer. The principle and the flow performance of the detection liquid, the angle change of the horizontal plane is calculated through the pressure change of the detection liquid at different heights by the pressure sensor, which improves the measurement accuracy, and the structure is simple and easy to use.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present utility model. For some new embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a grating optical fiber-based liquid pressure sensing inclinometer provided by an embodiment of the present utility model;

2 is a top view of a grating optical fiber-based liquid pressure sensing inclinometer provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional structural view taken along the line A-A in FIG. 2 .

In the figure: 1. Housing; 2. First pressure sensor; 3. Second pressure sensor; 4. Cover.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

Referring to FIGS. 1 to 3 , the liquid pressure sensing inclinometer based on grating optical fiber provided by the present invention will now be described. The liquid pressure sensing inclinometer based on grating optical fiber includes a casing 1 and a sensor group; the casing 1 has a solution cavity, and the solution cavity contains a detection liquid; the sensor group is arranged on the side wall of the solution cavity, and the sensor The group includes a plurality of first pressure sensors 2 located below the liquid level and a plurality of second pressure sensors 3 flush with the liquid level, and the plurality of first pressure sensors 2 and the plurality of second pressure sensors 3 are symmetrical in pairs. Evenly distributed along the circumferential direction of the solution chamber, the horizontal plane where the plurality of first pressure sensors 2 are located is parallel to the horizontal plane where the plurality of second pressure sensors 3 are located.

Compared with the prior art, the liquid pressure sensing inclinometer based on grating optical fiber provided by the utility model has a solution cavity in the casing 1, and the detection liquid is filled in the solution cavity. The first pressure sensor 2 and the second pressure sensor 3, wherein the first pressure sensor 2 is located below the liquid level in the solution chamber, and the second pressure sensor 3 is flush with the liquid level in the solution chamber.

When placed horizontally, the liquid level and the plurality of second pressure sensors 3 are located on the same level; the first pressure sensor 2 is located below the liquid level and is subjected to the gravity of the detected liquid, and the pressure values detected by the plurality of first pressure sensors 2 are consistent , and the pressure value is the detected liquid gravity at the location; at the same time, the height of the first pressure sensor 2 from the liquid surface and the second pressure sensor 3 and the first pressure can be calculated according to the pressure value detected by the first pressure sensor 2 Distance from sensor 2.

When detecting the angle of the inclined surface, the attachment plane on the casing 1 is contacted with the side to be side, and the detection liquid in the solution chamber will flow under the action of gravity. At this time, the pressure values detected by the plurality of first pressure sensors 2 are different The pressure values detected by each of the second pressure sensors 3 will change. The height h ₂ of the inclined first pressure sensor 2 from the liquid surface and the distance between the inclined first pressure sensor 2 and the second pressure sensor 3 can be calculated from the maximum pressure values detected by the plurality of first pressure sensors 2 the height difference to calculate the inclination angle.

The liquid pressure sensing inclinometer based on grating optical fiber provided by the utility model adopts the principle of grating optical fiber pressure sensing and detects the flow performance of the liquid, and calculates the horizontal plane through the pressure change of the pressure sensor at different heights in the detected liquid. The angle change improves the measurement accuracy, and the structure is simple and easy to use.

Optionally, both the first pressure sensor 2 and the second pressure sensor 3 are grating fiber pressure sensors.

In some possible embodiments, please refer to FIG. 1 and FIG. 3 , the solution chamber is an inverted quadrangular pyramid-shaped chamber, and the bottom surface of the housing 1 is parallel to the bottom surface of the solution chamber.

The solution cavity opened inside the casing 1 is an inverted quadrangular pyramid, wherein the top corner of the inverted quadrangular pyramid faces the bottom of the casing 1, and the bottom surface of the inverted quadrangular pyramid is located at the upper part of the casing 1 and is parallel to the bottom surface of the casing 1 .

The corresponding plurality of first pressure sensors 2 are evenly distributed on the four side walls of the solution chamber of the inverted quadrangular pyramid, wherein the pair of two first pressure sensors 2 are respectively arranged on the symmetrical sides of the solution chamber of the inverted quadrangular pyramid. on both side walls. The first pressure sensor 2 is located near the top corner.

Similarly, a plurality of second pressure sensors 3 are evenly distributed on the four side walls of the solution chamber of the inverted quadrangular pyramid, wherein two pairs of second pressure sensors 3 are respectively arranged in the symmetry of the solution chamber of the inverted quadrangular pyramid. on both side walls. The second pressure sensor 3 is arranged above the first pressure sensor 2 . When injecting the detection liquid into the solution chamber, it is necessary to keep the casing 1 in a horizontal state, and control the liquid level to be at the same level as the second pressure sensor 3 .

Optionally, the volume of the detection liquid in the solution chamber is two-thirds of the total volume of the solution chamber, providing a flow space for the detection liquid to ensure that the liquid level changes when the housing 1 is tilted.

In some possible embodiments, please refer to FIG. 3 , the number of the plurality of second pressure sensors 3 and the plurality of first pressure sensors 2 are the same, and they are arranged in a one-to-one correspondence.

The second pressure sensor 3 and the first pressure sensor 2 are set in one-to-one correspondence, and when the pressure value detected by a certain first pressure sensor 2 is the maximum value, the pressure value detected by the corresponding second pressure sensor 3 Can be used to calculate the tilt angle.

Specifically, the plane on which the two corresponding second pressure sensors 3 and the first pressure sensor 2 are located is perpendicular to the bottom surface of the housing 1 .

Optionally, a first pressure sensor 2 and a second pressure sensor 3 are provided on both the edge and the side wall of the inverted quadrangular pyramid-shaped solution chamber. The straight lines where the second pressure sensor 3 and the corresponding first pressure sensor 2 are located all pass through the apex angle of the inverted quadrangular pyramid.

In some possible embodiments, please refer to FIG. 3 , there are four first pressure sensors 2 , and the four first pressure sensors 2 are respectively disposed on the four side walls of the solution chamber.

Specifically, a first pressure sensor 2 is arranged on the four side walls of the inverted quadrangular pyramid-shaped solution chamber, and a second pressure sensor 3 is arranged above the first pressure sensor 2, and the first pressure sensor 2 and the second pressure sensor 3 The line on which it is located passes through the apex angle of the inverted quadrangular pyramid. The first pressure sensor 2 and the second pressure sensor 3 are arranged on the side wall for easy installation.

Optionally, the line connecting the centers of the first pressure sensor 2 and the second pressure sensor 3 located on the same side wall is located on the longitudinal center line of the side wall.

Specifically, when the inclinometer is placed horizontally to measure the ground inclination, it is necessary to check in advance whether the four first pressure sensors 2 in the solution chamber have the same values in the horizontal position and whether the four second pressure sensors 3 have the same values in the horizontal position. , to determine whether the inclinometer can be used normally. When placed horizontally, the values of the four first pressure sensors 2 are the same, and the numerical value is recorded as F ₁ , and the value of the four second pressure sensors 3 at the horizontal liquid level is F ^* , and the first pressure sensor 2 can be calculated. The height from the liquid surface is h ₁ :

Then the corresponding distance S ₁ between the first pressure sensor 2 and the second pressure sensor 3 is:

Place the inclinometer on the object to be measured, make the inclinometer contact the object, and record the pressure values F ₂ , F ₃ , F ₄ , and F ₅ of the four first pressure sensors 2 respectively. The comparison yields the maximum pressure value F _i of the four first pressure sensors 2 . Then it can be concluded that the maximum height of the corresponding first pressure sensor 2 from the current liquid level is h ₂ :

The pressure value measured by the second pressure sensor 3 on the same side wall of the first pressure sensor 2 corresponding to F _i is F ₆ , then it can be concluded that the height of the second pressure sensor 3 from the current liquid level is h ₃ :

The angle θ ₁ at this time:

The tilt angle Δθ of the object at this time is:

In some possible embodiments, the solution chamber contains mercury liquid.

Specifically, the filling of the solution chamber detects the liquid, and the pressure measured by the first pressure sensor 2 and the second pressure sensor 3 is calculated to obtain the inclination angle by means of the performance of detecting the fluidity of the liquid. However, the fluidity of the detection liquid will cause the liquid level to fluctuate greatly, and there will be large errors due to the continuous fluctuation of the liquid level during the measurement. If the mercury liquid has high density and fluidity, when the housing 1 is tilted, the liquid level fluctuation is small, which is convenient for the pressure value transmission of the pressure sensor, minimizes the error, and improves the measurement accuracy.

In some possible embodiments, please refer to FIG. 3 , the upper end of the casing 1 is provided with an accommodating groove, the casing 1 is connected with a cover 4 for sealing the accommodating groove, and the accommodating groove and the cover 4 define a solution cavity .

The upper end surface of the housing 1 is provided with a downwardly extending accommodating groove, the shape of the accommodating groove is an inverted quadrangular pyramid, the upper end of the accommodating groove is provided with a cover 4, and the cover 4 is connected with the casing 1 for connecting the port of the accommodating groove closed to enclose the solution chamber.

Optionally, the housing 1 is hinged with the cover 4, and the cover 4 can be opened and arranged so as to fill the detection liquid into the solution chamber.

Optionally, the lower end of the cover 4 is provided with a sealing ring.

In some possible embodiments, please refer to FIG. 3 , the casing 1 is a rectangular parallelepiped, and the casing 1 has a plurality of attachment planes for contacting the surface to be measured in the circumferential direction.

The bottom of the housing 1 can be placed on a relatively gentle slope, the housing 1 is a cuboid, and the outer side walls of the housing 1 are flat, which is convenient to fit the surface to be measured in all directions, improves the convenience of measurement, and realizes different Angle measurement in direction.

An attachment plane is set on the side wall of the shell 1, so that the shell 1 is attached to the building, so as to realize the real-time measurement of the inclination of the building.

Optionally, an adhesive layer is provided on the attachment plane.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (10)

1. the liquid pressure sensing inclinometer based on grating optical fiber, is characterized in that, comprises: a shell, the shell has a solution cavity, and the solution cavity contains the detection liquid; A sensor group is arranged on the side wall of the solution chamber, the sensor group includes a plurality of first pressure sensors located below the liquid level and a plurality of second pressure sensors flush with the liquid level, a plurality of the first pressure sensors Both the pressure sensors and the plurality of second pressure sensors are symmetrical in pairs and evenly distributed along the circumference of the solution chamber, and the horizontal planes where the plurality of first pressure sensors are located are parallel to the horizontal planes where the plurality of second pressure sensors are located . 2 . The liquid pressure sensing inclinometer based on grating fiber according to claim 1 , wherein the solution cavity is a cavity of an inverted quadrangular pyramid, and the bottom surface of the casing is connected to the surface of the solution cavity. 3 . The bottom surface is parallel. 3 . The liquid pressure sensing inclinometer based on grating optical fiber according to claim 2 , wherein the detection liquid volume in the solution chamber is two-thirds of the total volume of the solution chamber. 4 . 4 . The liquid pressure sensing inclinometer based on grating optical fiber according to claim 3 , wherein the number of the plurality of second pressure sensors and the plurality of first pressure sensors are the same and correspond one-to-one. 5 . set up. 5 . The liquid pressure sensing inclinometer based on grating optical fiber according to claim 4 , wherein the plane on which the two corresponding second pressure sensors and the first pressure sensor are located is perpendicular to the shell. 6 . underside of the body. 6 . The liquid pressure sensing inclinometer based on grating fiber according to claim 5 , wherein the number of the first pressure sensors is four, and the four first pressure sensors are respectively arranged in the solution chamber. 7 . on the four side walls. 7 . The liquid pressure sensing inclinometer based on grating optical fiber according to claim 6 , wherein the connecting line between the second pressure sensor and the first pressure sensor on the same side wall is located on the side wall where it is located. 8 . longitudinal midline. 8 . The grating optical fiber-based liquid pressure sensing inclinometer according to claim 1 , wherein the detection liquid is mercury liquid. 9 . 9 . The liquid pressure sensing inclinometer based on grating optical fiber according to claim 2 , wherein a receiving groove is formed on the upper end of the casing, and a receiving groove is connected to the casing for blocking the receiving groove. 10 . The solution cavity is surrounded by the accommodating groove and the cover. 10 . The liquid pressure sensing inclinometer based on grating fiber according to claim 1 , wherein the casing is a rectangular parallelepiped, and the circumference of the casing has a plurality of attachments for contacting the surface to be measured. 11 . flat.

Images