CN112987113A - Transient electromagnetic sensor and transient electromagnetic signal acquisition method - Google Patents
Transient electromagnetic sensor and transient electromagnetic signal acquisition method Download PDFInfo
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Abstract
The invention provides a transient electromagnetic sensor and a transient electromagnetic signal acquisition method; the transient electromagnetic sensor comprises an air core coil, an amplifier and an output interface which are connected in sequence; the transient electromagnetic sensor can be placed on a tripod, and the tripod is used for leveling the hollow coil; the hollow coil is used for acquiring a magnetic field response signal of the earth and obtaining induced electromotive force; the amplifier amplifies the induced electromotive force; the output interface is used for sending the amplified induced electromotive force to external equipment. The transient electromagnetic sensor provided by the invention uses the hollow coil, so that the problem that the magnetic core is easy to saturate by the magnetic core coil can be avoided, and the hollow coil has a larger cross section area, so that the hollow coil is ensured to have a larger receiving area. Simultaneously, this transient electromagnetic sensor's design size can guarantee that this sensor can install on the tripod to carry out field operation and improve the convenience that transient electromagnetic method measured.
Description
Technical Field
The invention relates to the technical field of induction coils, in particular to a transient electromagnetic sensor and a transient electromagnetic signal acquisition method.
Background
Transient Electromagnetic method is also called Time domain Electromagnetic method (TEM for short), and is a method of transmitting a primary pulse magnetic field to the ground by using a non-grounded return line or a grounded line source, and observing a secondary eddy current field by using a coil, a magnetic probe or a grounded electrode during the intermittence of the primary pulse magnetic field. According to the characteristic that the transient electromagnetic method is sensitive to low resistance body reaction, water-containing geology such as karst caves and channels, coal mine goafs, deep irregular water bodies and the like can be detected. The transient electromagnetic method has wide application in the aspects of improving the detection depth and searching low-resistance geologic bodies in high-resistance areas.
In the related art, the inductive sensor used in the transient electromagnetic method is mainly classified into two types, one is a rod sensor with a magnetic core, and the other is an air-core coil sensor. Although the transient electromagnetic rod-shaped induction type sensor can be assembled on a tripod for field operation, the magnetic core is easily saturated when a small transmitting wire frame is used due to the existence of the high-permeability magnetic core, so that the reliability of measured data is influenced; for an air-core coil sensor, although the diameter of the air-core coil sensor is generally larger than 50 cm, the receiving area is larger, and the problem of magnetic core saturation can be avoided, due to the fact that the air-core coil sensor is larger in size, a tripod cannot be used for leveling, the air-core coil sensor is difficult to use in the field, and particularly the air-core coil sensor is inconvenient to use in a steep terrain mountain area. Therefore, the inductive sensors used by the target transient electromagnetic method have the problem of inconvenient measurement.
Disclosure of Invention
The invention aims to provide a transient electromagnetic sensor and a transient electromagnetic signal acquisition method so as to improve the convenience of measurement by a transient electromagnetic method.
In a first aspect, the present invention provides a transient electromagnetic sensor; the transient electromagnetic sensor comprises an air core coil, an amplifier and an output interface which are connected in sequence; the transient electromagnetic sensor can be placed on a preset tripod, and the tripod is used for leveling the hollow coil; the air-core coil is used for acquiring a magnetic field response signal of the earth and obtaining induced electromotive force according to the magnetic field response signal; the amplifier amplifies the induced electromotive force to obtain an amplified induced electromotive force; the output interface is used for transmitting the amplified induced electromotive force to an external device.
In an alternative embodiment, the sensor further comprises a first housing; the first housing surrounds the outside of the air-core coil; the first housing is used for protecting the air-core coil.
In an alternative embodiment, the sensor further comprises a leveling blister; the leveling bubble is embedded in the first shell and is positioned above the first shell; the leveling bubble is used for indicating whether the hollow coil is leveled or not.
In an alternative embodiment, the sensor further comprises a battery connected to the amplifier; the battery is used to power the amplifier.
In an alternative embodiment, the sensor further comprises a second housing; the second housing is for enclosing the amplifier and the battery.
In an alternative embodiment, the amplifier is disposed above the battery; the output interface is embedded in the second shell, and the output interface is positioned below the second shell.
In an alternative embodiment, the first housing is connected with the second housing as a whole through a preset flange; or, the first shell and the second shell are adhered into a whole.
In an alternative embodiment, the first housing has a diameter of 25 cm; the diameter of the second shell is 7.5 cm; the second housing can be clamped to the tripod.
In a second aspect, an embodiment of the present invention provides a transient electromagnetic signal acquisition method, which is applied to the transient electromagnetic sensor described in any one of the foregoing embodiments; the transient electromagnetic sensor can be placed on a preset tripod; the transient electromagnetic sensor comprises an air core coil, an amplifier and an output interface which are connected in sequence; the method comprises the following steps: the transient electromagnetic sensor is placed on a tripod, and after the hollow coil is leveled by the tripod, a magnetic field response signal of the ground is obtained through the hollow coil, and induced electromotive force is obtained according to the magnetic field response signal; amplifying the induced electromotive force through the amplifier to obtain an amplified induced electromotive force; and sending the amplified induced electromotive force to an external device through the output interface.
In an optional embodiment, the step of obtaining a magnetic field response signal of the earth through the air-core coil and obtaining an induced electromotive force according to the magnetic field response signal includes: converting the magnetic field response signal into an induced electromotive force by the following equation:
e＝-jωNSB
wherein e represents induced electromotive force at both ends of the air-core coil; b represents a magnetic field response signal; ω represents the angular frequency of the magnetic field of the earth; n represents the number of turns of the air-core coil; s represents a cross-sectional area of a section surrounded by the air-core coil.
The embodiment of the invention has the following beneficial effects:
the invention provides a transient electromagnetic sensor and a transient electromagnetic signal acquisition method; the transient electromagnetic sensor comprises an air core coil, an amplifier and an output interface which are connected in sequence; the transient electromagnetic sensor can be placed on a preset tripod, and the tripod is used for leveling the hollow coil; the air-core coil is used for acquiring a magnetic field response signal of the earth and obtaining induced electromotive force according to the magnetic field response signal; the amplifier amplifies the induced electromotive force to obtain the amplified induced electromotive force; the output interface is used for sending the amplified induced electromotive force to external equipment. The transient electromagnetic sensor provided by the invention uses the hollow coil, so that the problem that the magnetic core is easy to saturate by the magnetic core coil can be avoided, and the hollow coil has a larger cross section area, so that the hollow coil is ensured to have a larger receiving area. Simultaneously, this transient electromagnetic sensor's design size can guarantee that this sensor can install on the tripod to carry out field operation and improve the convenience that transient electromagnetic method measured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention as set forth above.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a schematic view of a conventional rod sensor with a magnetic core;
FIG. 2 is a schematic diagram of a prior art air coil sensor;
FIG. 3 is a schematic diagram of a transient electromagnetic sensor provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of another transient electromagnetic sensor provided by an embodiment of the present invention;
FIG. 5 is a schematic view of an assembly of a transient electromagnetic sensor and a tripod according to an embodiment of the present invention;
fig. 6 is a flowchart of a transient electromagnetic signal acquisition method according to an embodiment of the present invention.
Icon: 101-air core coil; 102-an amplifier; 103-an output interface; 201-leveling the blister; 202-a first housing; 203-a second housing; 204-flange plate; 205-a battery; 50-a tripod; 51-transient electromagnetic sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Transient electromagnetic methods are generally a method of detecting the resistivity of a medium by transmitting a primary pulsed magnetic field into the ground using an ungrounded return wire or ground wire source, and observing a secondary induced eddy current field induced in the underground medium during the interval of the primary pulsed magnetic field using a coil or ground electrode.
The basic working method of the transient electromagnetic method comprises the following steps: firstly, a transmitting coil is arranged on the ground or in the air and can transmit current with a certain waveform, so that a primary electromagnetic field is generated in the space around the transmitting coil, induced current is generated in an underground conductive rock ore body, and the induced current decays along with time due to heat loss after power failure. The attenuation process is generally divided into an early stage, a middle stage and a late stage, wherein the early electromagnetic field is equivalent to a high-frequency component in a frequency domain and has the characteristics of fast attenuation and small skin depth; and the late electromagnetic field component is equivalent to the low-frequency component in the frequency domain, and has the characteristics of slow attenuation and large skin depth. In practical application, the electrical property difference and the spatial distribution form of the underground abnormal geologic body can be inferred by measuring and calculating the time-varying law (attenuation curve) of the secondary field in each time period of the power supply intermission period. The transient electromagnetic method is one of practical and reliable geophysical prospecting methods for low-resistance abnormal mapping and metal mine, coal field and underground water exploration. The existing transient electromagnetic method field working device comprises a transmitter, a receiver and a receiving sensor. The transmitter repeatedly transmits square waves with the duty ratio of 50% in a transmission wire frame, and records the response process of the ground in the transmission interval period, so that the underground magnetic field is detected.
In the related art, the transient electromagnetic method uses an inductive sensor which can be largely classified into two types. One is a rod sensor with a magnetic core, which can be leveled using a tripod, as shown in fig. 1; one is an air coil sensor, as shown in fig. 2, which has a large diameter, generally greater than 50 cm, and cannot be leveled by a tripod, and is inconvenient for field use. Moreover, for the bar-shaped induction type sensor for transient electromagnetism, due to the existence of the high-permeability magnetic core, the magnetic core is easily saturated when a small emitting wire frame is used, and the measurement is influenced; the existing hollow coil sensor for transient electromagnetism cannot be leveled by using a tripod due to large volume, is difficult to use in the field, and is particularly difficult to use in a steep terrain mountain area and inconvenient. Therefore, the current induction type sensors used by the transient electromagnetic method have the problem of inconvenient measurement.
Based on the above problems, embodiments of the present invention provide a transient electromagnetic sensor and a transient electromagnetic signal acquisition method, which can be applied to scenes in various induction coil technical fields.
In order to facilitate understanding of the embodiment of the present invention, a transient electromagnetic sensor provided in the embodiment of the present invention is first described in detail, as shown in fig. 3, the transient electromagnetic sensor includes an air core coil 101, an amplifier 102, and an output interface 103, which are connected in sequence; the transient electromagnetic sensor can be placed on a preset tripod that is used to level the hollow coil 101.
The air-core coil 101 is used for acquiring a magnetic field response signal of the earth and obtaining induced electromotive force according to the magnetic field response signal; the amplifier 102 is configured to amplify the induced electromotive force to obtain an amplified induced electromotive force; the output interface 103 is used for transmitting the amplified induced electromotive force to an external device.
Specifically, the air-core coil 101 includes two parts, namely, an air-core bobbin and a coil. The hollow framework generally means that nothing is arranged in the center, the coil generally means that wires are wound one by one and wound into any shape such as a circle, a rectangle and the like, the wires are mutually insulated, and the wires can be made of metal materials such as copper, iron, aluminum and the like. Generally, the shape enclosed by the air core coil 101 has a larger cross-sectional area, which is more convenient for receiving external signals.
The air core coil 101 can obtain external signals, and the larger the cross-sectional area surrounded by the air core coil 101 is, the more comprehensive and accurate external signals can be obtained. The air-core coil 101 converts a magnetic field response signal acquired from the outside into an induced electromotive force, thereby judging the configuration of the inside of the earth.
The amplifier 102 is generally composed of an amplifier and a filter, and the amplifier 102 can amplify the voltage of an input signal. The amplifier 102 is a preamplifier. Usually, the preamplifier has a high voltage gain, and can amplify a small signal to a standard signal.
The output interface 103 is typically an aircraft plug interface, and can transmit information induced by the air-core coil 101 to an external device. The external device may be a dedicated geophysical receiving device.
The transient electromagnetic sensor is provided with an air core coil 101 at the upper part, and an amplifier 102 and an output interface 103 at the lower part. The sensor is wide at the top and narrow at the bottom, so that the hollow coil 101 can be ensured to have a large receiving area, and the sensor can be arranged on a preset tripod so as to facilitate field operation. When the field exploration is carried out, the transient electromagnetic sensor is required to be placed on a tripod, and the tripod is utilized to level the bubble 201, so that the hollow coil 101 in the transient electromagnetic sensor is leveled, and a magnetic field signal received by the hollow coil 101 is a vertical magnetic field response signal.
The embodiment provides a transient electromagnetic sensor, which comprises an air-core coil, an amplifier and an output interface which are connected in sequence; the transient electromagnetic sensor can be placed on a preset tripod, and the tripod is used for leveling the hollow coil; the air-core coil acquires a magnetic field response signal of the earth and obtains induced electromotive force according to the magnetic field response signal; the amplifier amplifies the induced electromotive force to obtain the amplified induced electromotive force; and the output interface sends the amplified induced electromotive force to external equipment. The transient electromagnetic sensor provided by the invention uses the hollow coil, so that the problem that the magnetic core is easy to saturate by the magnetic core coil can be avoided, and the hollow coil has a larger cross section area, so that the hollow coil is ensured to have a larger receiving area. Simultaneously, the design size guarantees that this sensor can install on the tripod to in field work and the convenience that improves the measurement of transition electromagnetic method.
An embodiment of the present invention further provides another transient electromagnetic sensor, as shown in fig. 4, which includes an air core coil 101, an amplifier 102 and an output interface 103, which are connected in sequence.
Further, the above transient electromagnetic sensor further comprises a first housing 202; the first case 202 surrounds the outside of the air-core coil 101; the first case 202 serves to protect the air-core coil 101.
In a specific implementation, the air-core coil 101 may be surrounded in a circular shape, a rectangular shape, or the like; the first housing 202 may be shaped according to the shape of the hollow coil 101, for example, it may be cylindrical, square, rectangular parallelepiped, or the like.
Further, the transient electromagnetic sensor further comprises a leveling bubble 201; the leveling bubble 201 is embedded in the first housing 202, and the leveling bubble 201 is located above the first housing 202; the leveling bubble 201 is used to indicate whether the air core coil 101 is leveled.
The leveling bubble 201 generally includes a frame type horizontal bubble and a bar type horizontal bubble, and the frame type horizontal bubble and the bar type horizontal bubble are mainly used for checking the straightness of various machine tools and other equipment, the correctness of the horizontal position and the vertical position of installation, and a tiny inclination angle. The strip-shaped horizontal air bubbles are suitable for plane horizontal operation. In specific operation, the sensor is firstly placed on a tripod, and the leveling bubble 201 in the sensor is in an equilibrium position by adjusting the tripod, so that the air coil 101 is ensured to be horizontal, and finally, the vertical magnetic field response signal is received by the air coil 101.
Further, the transient electromagnetic sensor further comprises a battery 205 connected to the amplifier 102; the battery 205 is used to power the amplifier 102. The amplifier 102 in this embodiment is a preamplifier. The battery can be formed by connecting battery packs in parallel or in series, and can also be a single battery. The battery 205 may be a lithium battery or a secondary battery.
Further, the transient electromagnetic sensor further comprises a second housing 203; the second housing 203 is used to enclose the amplifier 102 and the battery 205.
In a specific implementation, the second housing 203 may be cylindrical, square, rectangular, or the like. And the cross-sectional area of the second shell 203 is smaller than that of the first shell 202, so that the second shell 203 of the sensor can be stably placed on a tripod to facilitate field operation.
In a specific implementation, the amplifier 102 is disposed above the battery 205; the output interface 103 is embedded on the second housing 203, and the output interface 103 is located below the second housing 203.
In some embodiments, the first housing 202 is integrally connected to the second housing 203 via a predetermined flange 204. The flange 204 is generally a non-metallic body having a disk-like shape and several holes for fastening to other members. The flange 204 is a disk-like member, typically used in pairs. At the end points where two objects are required to be connected, one flange 204 is arranged, a sealing gasket is arranged between the two flanges 204, and then the two flanges are fastened by bolts, so that the two objects are connected into a whole.
In other embodiments, the first housing 202 and the second housing 203 may be integrally bonded. For example, a predetermined glue is used to adhere the two into a whole.
Further, the diameter of the first housing 202 is 25 cm; the diameter of the second housing 203 is 7.5 cm; the second housing 203 can be clamped on a tripod. As shown in fig. 4, the diameter of the first housing 202 is significantly larger than the diameter of the second housing 203.
In specific implementation, the existing hollow coil 101 has a large diameter, generally the diameter is larger than 50 cm, a tripod cannot be used for leveling, and the field use is very inconvenient. According to the invention, the diameter of the hollow coil 101 is reduced to 25 cm, the diameter of the receiving coil (namely the hollow coil 101) is too large, so that the field operation is inconvenient, the sensitivity of the sensor is influenced if the diameter is too small, and experiments prove that the diameter arranged in the structure can ensure a certain receiving area, ensure the sensitivity of the sensor and be suitable for the field operation.
The design that the transient electromagnetic sensor is wide at the top and narrow at the bottom can ensure that the second shell can be additionally held on a tripod, so that the sensing of a transient electromagnetic field is realized; and the setting of the transient electromagnetic sensor in this application is convenient for carry out field work on the tripod, can improve the convenience that the transient electromagnetic method measured.
With respect to the above-described embodiment of the transient electromagnetic sensor, the present embodiment also provides a transient electromagnetic sensing apparatus, as shown in fig. 5, which includes a tripod 50 and a transient electromagnetic sensor 51.
In a specific implementation, the transient electromagnetic sensor 51 is firstly assembled in a slot of the tripod 50 and the tripod 50 is used to level the transient electromagnetic sensor 51, and then the magnetic field of the ground is detected.
The tripod 50 is used for leveling the air coil in the transient electromagnetic sensor 51; the transient electromagnetic sensor 51 can convert the received magnetic field response signal of the earth into an induced electromotive force, amplify the induced electromotive force, and finally transmit the amplified induced electromotive force to an external device.
The implementation principle and the generated technical effect of the transient electromagnetic sensing device provided by the embodiment of the invention are the same as those of the transient electromagnetic sensing device embodiment, and for brief description, the corresponding contents in the method embodiment can be referred to where the device embodiment is not mentioned.
For the above-mentioned embodiment of the transient electromagnetic sensor, and the embodiment of the transient electromagnetic sensing device, the present embodiment provides a transient electromagnetic signal acquisition method, which is applied to the above-mentioned transient electromagnetic sensor device; as shown in fig. 6, the transient electromagnetic signal acquisition method includes the steps of:
step S602, obtaining a magnetic field response signal of the earth through the air-core coil, and obtaining an induced electromotive force according to the magnetic field response signal.
During concrete implementation, at first place the sensor on predetermined tripod, then adjust the tripod according to the leveling blister of sensor top to guarantee that the hollow coil in the sensor receives the magnetic field response signal of vertical direction, this hollow coil turns into induced electromotive force with magnetic field response signal next, and concrete formula is:
e＝-jωNSB (1)
wherein e represents induced electromotive force at both ends of the air-core coil; b represents a magnetic field response signal; ω represents the angular frequency of the magnetic field of the earth; n represents the number of turns of the air-core coil; s represents a cross-sectional area of a section surrounded by the air-core coil.
Furthermore, the initial sensitivity of the air coil is:
e/B＝-jωNS (2)
where e/B represents the initial sensitivity of the air coil, which is defined as a value without amplifier amplification.
In general, the sensitivity of the transient magnetic field sensor is measured by the effective area S' of the magnetic field sensor, and the formula is:
S’＝S0×K＝N×S×K (3)
wherein S is0N × S, S' is defined as the effective area of the air coil, and K is the amplification factor of the amplifier.
As can be seen from equation (3), in order to obtain a sensor with a sensitivity that can be high, the number of turns N of the air-core coil can be increased, the cross-sectional area S of the cross section surrounded by the air-core coil can be increased, and the amplification factor K of the amplifier can also be increased. However, increasing the number of turns N of the air-core coil leads to an increase in inductance and distributed capacitance, and finally leads to a narrowing of the bandwidth of the sensor; the circuit for increasing the amplification factor K of the amplifier is easy to generate oscillation, limits the bandwidth, and cannot improve the signal-to-noise ratio of the sensor. In summary, a feasible method is to increase the cross-sectional area S of the cross section surrounded by the air-core coil within a reasonable range.
Step S604, the induced electromotive force is amplified by the amplifier to obtain an amplified induced electromotive force.
And step S606, the amplified induced electromotive force is sent to an external device through an output interface.
Specifically, the amplified induced electromotive force is a transient electromagnetic signal.
The transient electromagnetic signal acquisition method provided by the embodiment avoids the problem that a magnetic core of a coil with the magnetic core is easy to saturate, and the coil has a wide frequency band and a large dynamic range; in addition, the diameter of the receiving coil (namely, the hollow coil) is larger, so that the receiving area of the coil is favorably increased, and the sensitivity of the sensor is improved.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The transient electromagnetic sensor is characterized by comprising an air-core coil, an amplifier and an output interface which are sequentially connected; the transient electromagnetic sensor can be placed on a preset tripod, and the tripod is used for leveling the hollow coil;
the air-core coil is used for acquiring a magnetic field response signal of the earth and obtaining induced electromotive force according to the magnetic field response signal; the amplifier amplifies the induced electromotive force to obtain amplified induced electromotive force; and the output interface is used for transmitting the amplified induced electromotive force to external equipment.
2. The sensor of claim 1, further comprising a first housing; the first housing surrounds an exterior of the air coil; the first housing is used for protecting the air-core coil.
3. The sensor of claim 2, further comprising a leveling blister; the leveling bubble is embedded in the first shell and is positioned above the first shell; the leveling bubble is used for indicating whether the hollow coil is leveled or not.
4. The sensor of claim 2, further comprising a battery connected to the amplifier; the battery is used for supplying power to the amplifier.
5. The sensor of claim 4, further comprising a second housing; the second housing is configured to enclose the amplifier and the battery.
6. The sensor of claim 5, wherein the amplifier is disposed above the battery; the output interface is embedded on the second housing, and the output interface is located below the second housing.
7. The sensor of claim 5, wherein the first housing is integrally connected to the second housing by a predetermined flange; or the first shell and the second shell are adhered into a whole.
8. The sensor of claim 5, wherein the first housing has a diameter of 25 centimeters; the diameter of the second housing is 7.5 centimeters; the second housing is capable of being clamped on the tripod.
9. A transient electromagnetic signal acquisition method, characterized in that the method is applied to the transient electromagnetic sensor of any one of the preceding claims 1-8; the transient electromagnetic sensor can be placed on a preset tripod; the transient electromagnetic sensor comprises an air core coil, an amplifier and an output interface which are connected in sequence; the method comprises the following steps:
the transient electromagnetic sensor is placed on the tripod, and after the hollow coil is leveled by the tripod, a magnetic field response signal of the ground is obtained through the hollow coil, and induced electromotive force is obtained according to the magnetic field response signal;
amplifying the induced electromotive force through the amplifier to obtain amplified induced electromotive force;
and sending the amplified induced electromotive force to an external device through the output interface.
10. The method of claim 9, wherein the step of acquiring a magnetic field response signal of the earth through the air coil and obtaining an induced electromotive force according to the magnetic field response signal comprises:
converting the magnetic field response signal into the induced electromotive force by the following equation:
e＝-jωNSB
wherein e represents induced electromotive forces at both ends of the air-core coil; b represents the magnetic field response signal; ω represents the angular frequency of the magnetic field of the earth; n represents the number of turns of the air coil; and S represents the cross-sectional area of the cross section surrounded by the hollow coil.
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| CN114690249A (en) * | 2022-04-02 | 2022-07-01 | 重庆大学 | Transient electromagnetic acquisition device and transient electromagnetic signal acquisition method |
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| WO2015014161A1 (en) * | 2013-07-30 | 2015-02-05 | 中国冶金地质总局山东正元地质勘查院 | Method and device for high-precision field measurement of terrestrial magnetism vectors |
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| CN114690249A (en) * | 2022-04-02 | 2022-07-01 | 重庆大学 | Transient electromagnetic acquisition device and transient electromagnetic signal acquisition method |
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