CN118463787A - LVDT displacement sensor capable of identifying electromagnetic interference and identification method - Google Patents
LVDT displacement sensor capable of identifying electromagnetic interference and identification method Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 15
- 230000003750 conditioning effect Effects 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000011088 calibration curve Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 8
- 230000006698 induction Effects 0.000 description 7
- 230000005284 excitation Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- RZVHIXYEVGDQDX-UHFFFAOYSA-N 9,10-anthraquinone Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 RZVHIXYEVGDQDX-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- QVZNQFNKKMMPFH-UHFFFAOYSA-N chromium niobium Chemical compound [Cr].[Nb] QVZNQFNKKMMPFH-UHFFFAOYSA-N 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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Abstract
The invention relates to an LVDT displacement sensor capable of identifying electromagnetic interference, which belongs to the field of electronic elements, and comprises an oscillator, a buffer, a primary coil, two secondary coils, a movable iron core, a signal conditioning circuit and a mode regulating circuit, wherein the primary coil is connected with the oscillator; the oscillator is connected with the buffer, the buffer is connected with the primary coil, one ends of the two secondary coils are grounded, the other ends of the two secondary coils are connected with the signal conditioning circuit, and the movable iron core is arranged between the primary coil and the two secondary coils; the mode adjusting circuit is connected to one of the secondary coils, and the sensor is in different modes by controlling the connection or disconnection of the secondary coil and the signal conditioning circuit, so that whether the sensor is subjected to electromagnetic interference is judged. The invention can realize the identification of high-frequency electromagnetic interference and low-frequency magnetic field interference by matching a low-complexity hardware design with a lightweight software algorithm, and provides safety authentication for the output data of the LVDT in a complex electromagnetic environment.
Description
Technical Field
The invention relates to the field of electronic elements, in particular to an LVDT displacement sensor capable of identifying electromagnetic interference and an identification method.
Background
The linear displacement sensor commonly used in the aerospace and industrial automation fields is a Linear Variable Differential Transformer (LVDT); the device mainly comprises a primary coil, two symmetrical secondary coils, a movable iron core, a measuring rod, an internal excitation source (such as an oscillator) and a signal processing circuit. The iron core moves along with the movement of the measured object, the displacement is converted into the variable quantity of mutual inductance between the primary coil and the secondary coil, and the variable quantity is finally reflected on the change of the output voltage of the secondary coil.
In the field of aerospace and industrial automation, there are various displacement measurement requirements, such as measurement of the steering column position, pedal position, valve displacement, cylinder displacement and rolling distance of an aircraft. Under the application scene of measuring the position of an airplane steering column, the LVDT converts the steering instruction of an airplane pilot into an electric signal and sends the electric signal into a flight control computer, and whether the electric signal can work normally or not directly relates to airplane steering and even flight safety. The LVDT has weak working signals and contains a large number of analog circuit devices, and is very sensitive to high-frequency electromagnetic interference; meanwhile, the front-end sensing element comprises a coil and is also very sensitive to low-frequency magnetic field interference. The external electromagnetic interference signal may cause the output of the LVDT to shift, causing its superordinate controller to receive the wrong sensing data and possibly causing serious consequences.
Simulation methods exist in the prior art for analyzing and compensating for the magnetic field radiation sensitivity of LVDTs in Ansys Maxwell. Firstly, building a physical structure model of the LVDT in an Ansys Maxwell, and then adding an excitation source and a signal processing circuit for the physical structure model in a Maxwell Circuit Editor module; then simulating the output characteristic curves of the LVDT under the normal working condition and the external magnetic field interference working condition; finally, a magnetic shielding layer is added at the shell of the LVDT, and simulation and analysis are carried out on the influence of the magnetic shielding layer on the output characteristic curve of the LVDT, so that the anti-interference capability of the LVDT on magnetic field radiation can be improved through the magnetic shielding layer. However, the method only focuses on the magnetic sensitivity of the LVDT, only improves the capability of the LVDT for resisting magnetic field interference, but does not improve the capability of the LVDT for finding magnetic field interference, and does not relate to the immunity of the LVDT to external high-frequency electromagnetic fields. Therefore, the method cannot comprehensively improve the capability of resisting electromagnetic interference attack of the LVDT. The coil winding of the LVDT sensor is covered by an insulating compound, gaps among coils are filled by the insulating compound, the LVDT sensor can bear higher temperature and radiation dose than loose wires, meanwhile, the coils of the LVDT sensor are made of chromium-niobium bronze, and are made of high-temperature-resistant and radiation-resistant materials, and the radiation resistance and the high-temperature resistance of the LVDT sensor are both higher than those of copper wires, so that the LVDT sensor can stably operate in a radiation environment in a nuclear power station. However, the high temperature resistant strong radiation LVDT sensor disclosed in this way is resistant to high temperature and strong nuclear radiation, but has no enhancement in resistance to electromagnetic interference attack.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an LVDT displacement sensor capable of identifying electromagnetic interference and an identification method, and solves the defects in the prior art.
The aim of the invention is achieved by the following technical scheme: an LVDT displacement sensor for identifying electromagnetic interference, the sensor comprising an oscillator, a buffer, a primary coil, two secondary coils, a movable core, and signal conditioning circuitry, and further comprising mode adjustment circuitry;
The oscillator is connected with the buffer, the buffer is connected with the primary coil, one ends of the two secondary coils are grounded, the other ends of the two secondary coils are connected with the signal conditioning circuit, and the movable iron core is arranged between the primary coil and the two secondary coils;
the mode adjusting circuit is connected to one of the secondary coils, and the sensor is in different modes by controlling the connection or disconnection of the secondary coil and the signal conditioning circuit, so that whether the sensor is subjected to electromagnetic interference is judged.
The mode adjusting circuit comprises switching devices M1 and M2; the switching device M1 is connected with the signal conditioning circuit, and the switching device M2 is connected with the second control voltage;
The switching device M1 is connected with the switching device M2 and the first control voltage and is grounded through a resistor;
When the first control voltage control switch device M1 is opened and the second control voltage control switch device M2 is closed, the secondary coil is connected with the signal conditioning circuit, the sensor is in a normal mode, and when the first control voltage control switch device M1 is closed and the second control voltage control switch device M2 is opened, the secondary coil is disconnected with the signal conditioning circuit, and the sensor is in a self-checking mode; and judging whether the output in the two modes meets the constraint relation or not according to the judgment, and further judging whether the electromagnetic interference is received or not.
The constraint relationship comprisesWherein, O n and O c are respectively the outputs in the normal mode and the self-checking mode when the movable iron core is displaced, d n and d c are respectively the outputs in the normal mode and the self-checking mode when the movable iron core is not displaced and no electromagnetic interference exists, and k 1 and k 2 are respectively the corresponding calibration curve slopes in the normal mode and the self-checking mode;
If the outputs O n and O c in the normal mode and the self-checking mode meet the constraint relation when the movable iron core is displaced, the electromagnetic interference is judged to be absent, and if the constraint relation is not met, the electromagnetic interference is judged to be present.
The signal conditioning circuit comprises an adder, a half-wave rectifier and a low-pass filter; the oscillator provides sine wave excitation with the angular frequency omega for the primary coil, induction signals with the amplitude approximately changing linearly along with the position of the iron core and the phase difference of 180 degrees are generated on the two secondary coils to the adder, the two paths of induction signals are added and amplified by the adder, then the signal processed by the adder is subjected to positive half cycle or negative half cycle through the half-wave rectifier, and finally the signal component which is more than or equal to omega is filtered through the low-pass filter and added with the direct current offset component, so that a non-negative output signal which finally comprises the information of the measured displacement and the direction is obtained.
The electromagnetic interference identification method comprises the following steps:
The sensor is in a normal mode or a self-checking mode by controlling the opening and closing states of the switching devices M1 and M2 through the first control voltage and the second control voltage, and the corresponding calibration curve slopes k 1 and k 2 in the normal mode and the self-checking mode are obtained;
Acquiring the output d n and d c of the sensor in the normal mode and the self-checking mode when the movable iron core is not displaced and no electromagnetic interference exists;
Acquiring outputs O n and O c of the sensor in a normal mode and a self-checking mode when the movable iron core is displaced;
Whether the sensor is subjected to electromagnetic interference is judged by judging whether the outputs in the two modes meet the constraint relation at the moment.
The controlling the switching states of the switching devices M1 and M2 by the first control voltage and the second control voltage to make the sensor in the normal mode or the self-checking mode specifically includes:
When the first control voltage controls the switching device M1 to be opened and the second control voltage controls the switching device M2 to be closed, a secondary coil connected with the switching device M2 is connected with a signal conditioning circuit, and the sensor is in a normal mode;
when the first control voltage controls the switching device M1 to be closed and the second control voltage controls the switching device M2 to be opened, the secondary coil connected with the switching device M2 is disconnected from the signal conditioning circuit, and the sensor is in a self-checking mode.
The constraint relationship comprisesIf the outputs in the two modes meet the constraint relation, the sensor is judged not to be subjected to electromagnetic interference at the moment, otherwise, the sensor is judged to be subjected to electromagnetic interference.
The invention has the following advantages: the LVDT displacement sensor capable of identifying electromagnetic interference and the identification method thereof can identify high-frequency electromagnetic interference and low-frequency magnetic field interference by matching a low-complexity hardware design with a lightweight software algorithm, and provide safety authentication for output data of the LVDT in a complex electromagnetic environment.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic illustration of calibration curves for two modes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Accordingly, the following detailed description of the embodiments of the application, as presented in conjunction with the accompanying drawings, is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application. The application is further described below with reference to the accompanying drawings.
As shown in fig. 1, the present invention relates to an LVDT displacement sensor capable of recognizing electromagnetic interference, which includes an oscillator, a buffer, a primary coil, two secondary coils, a movable iron core and a signal conditioning circuit, wherein the movable iron core moves along with the movement of a measured object, so as to change the mutual inductance between the primary coil and the secondary coil, and the signal conditioning circuit includes an adder, a half-wave rectifier and a low-pass filter.
The oscillator provides a sine wave excitation with an angular frequency omega to the primary coil, and then generates an induction signal with an amplitude approximately linearly varying with the position of the iron core and 180 DEG out of phase on the two secondary coils, as shown in the following formula:
Vo1＝A1·sin(ωt)(1)
Vo2＝-A2·sin(ωt)(2)
In the above formula, a 1 and a 2 represent the amplitudes of the two sensing signals, respectively.
The two paths of sensing signals are added and amplified by an adder to obtain the following signal:
VA＝kA·(A1-A2)·sin(ωt)(3)
where k A represents the gain of the adder. The half-wave rectification module then takes out either the positive half-cycle or the negative half-cycle of V A according to the magnitude relationship of a 1 and a 2, as shown in the following equation:
Where k B is the gain of the half-wave rectifier, sign (x) is a sign function, defined as follows:
The low pass filter filters out the signal components with the frequency higher than or equal to omega in V H and adds the direct current offset component, so that the final non-negative output signal V O is obtained.
Finally, the V O also contains the information of the magnitude and direction of the measured displacement.
The LVDT has weak working signals, a large number of analog circuit devices are contained in the LVDT, and PCB wiring and interconnection cables interact with external high-frequency electromagnetic interference signals to generate interference voltage and current, so that nonlinear effects of analog devices such as an operational amplifier are induced. In addition, the front end sensing element of the LVDT comprises a coil which can interact with an external low-frequency magnetic field to generate illegal induction signals and is mutually overlapped with legal normal working signals to participate in the subsequent signal conditioning process. The sensitivity characteristics of the LVDT to external magnetic field disturbances are then analysed.
Assuming that the angular frequency of the external magnetic field is ω m, the secondary coil output signal containing the illegal induction signal is:
Vo ′ 1＝A1·sin(ωt)+B1·sin(ωmt+φm1)(7)
Vo ′ 2＝-A2·sin(ωt)-B2·sin(ωmt+φm2)(8)
in the above formula, B 1 and B 2 represent the amplitudes of two illegal sensing signals, and phi m1 and phi m2 represent the phase differences of the illegal sensing signals relative to the original legal sensing signals. The output signal of the adder then also changes.
The outputs of the half-wave rectifier and the low-pass filter are changed accordingly, denoted V H ′ and V O ′, respectively. The analysis process can know that the illegal induction signal and the original legal induction signal are mixed together to participate in the nonlinear processing of the subsequent circuit, so that legal components in the final output of the LVDT and illegal components caused by magnetic field interference are coupled together in a nonlinear manner.
Further, as shown in fig. 1, two switching devices M1 and M2, both of which are JFET (junction field effect transistor) types, are used to control whether one secondary coil of the LVDT is connected to the back-end signal conditioning circuit, the source of the switching device M2 is connected to the signal conditioning circuit, the drain is connected to one of the secondary coils, and the gate is connected to the second control voltage; the source electrode of the switching device M1 is connected with the drain electrode of the switching device M2, the drain electrode is grounded through a resistor, and the grid electrode is connected with a first control voltage; here, the source and drain connections of the switching devices M1 and M2 may also be switched with each other.
When the first control voltage control switch device M1 is opened, the second control voltage control switch device M2 is closed, the secondary coil is connected with the signal conditioning circuit, the sensor is in a normal mode, and when the first control voltage control switch device M1 is closed, the second control voltage control switch device M2 is opened, the secondary coil is disconnected with the signal conditioning circuit, and the sensor is in a self-checking mode.
As shown in fig. 2, there are two calibration curves corresponding to the two modes of the LVDT; the first control voltage and the second control voltage are controlled and output through a lightweight software algorithm, and the two switching devices M1 and M2 control the LVDT to rapidly switch between the two modes under the action of an externally input control signal.
When the displacement is 0mm, the output of the LVDT in the normal mode and the self-checking mode is d and d, and the specific position of the iron core is determined
n c
Shift, when there is no electromagnetic interference signal, the LVDT outputs O and O in the normal mode and the self-test mode, which satisfy the following about
n c
Beam relation:
In the above formula, k 1 and k 2 are slopes of two calibration curves respectively, wherein a value of 2.05 has no universality, and different values can be determined according to different LVDTs.
Under the influence of electromagnetic interference signals, the quantization relation between the output offsets of the LVDT in the two modes is uncontrollable, so that the equation (10) does not hold with a high probability. For high-frequency electromagnetic interference signals, the on-off of the secondary coil caused by the switching of the JFET leads the field line coupling characteristic of the LVDT to be obviously changed, so that nonlinear effects of analog circuit devices such as an operational amplifier and the like in two modes are obviously changed; for low frequency magnetic fields this is due to the coupling of legal and illegal components in the final output of the LVDT in a nonlinear manner. Thus, by detecting whether a set of outputs of the LVDT in both modes satisfies equation (11), identification of both high frequency electromagnetic interference and low frequency magnetic field interference can be achieved. In order to further improve the identification success rate, both secondary coils can be designed to be independently switched, so that three calibration curves exist, and the constraint relation is further enhanced.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and adaptations, and of being modified within the scope of the inventive concept described herein, by the foregoing teachings or by the skilled person or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. An LVDT displacement sensor for identifying electromagnetic interference, the sensor comprising an oscillator, a buffer, a primary coil, two secondary coils, a movable core and signal conditioning circuitry, characterized by: the device also comprises a mode adjusting circuit;
The oscillator is connected with the buffer, the buffer is connected with the primary coil, one ends of the two secondary coils are grounded, the other ends of the two secondary coils are connected with the signal conditioning circuit, and the movable iron core is arranged between the primary coil and the two secondary coils;
the mode adjusting circuit is connected to one of the secondary coils, and the sensor is in different modes by controlling the connection or disconnection of the secondary coil and the signal conditioning circuit, so that whether the sensor is subjected to electromagnetic interference is judged.
2. An LVDT displacement sensor for identifying electromagnetic interference according to claim 1 wherein: the mode adjusting circuit comprises switching devices M1 and M2; the switching device M1 is connected with the signal conditioning circuit, and the switching device M2 is connected with the second control voltage;
The switching device M1 is connected with the switching device M2 and the first control voltage and is grounded through a resistor;
When the first control voltage control switch device M1 is opened and the second control voltage control switch device M2 is closed, the secondary coil is connected with the signal conditioning circuit, the sensor is in a normal mode, and when the first control voltage control switch device M1 is closed and the second control voltage control switch device M2 is opened, the secondary coil is disconnected with the signal conditioning circuit, and the sensor is in a self-checking mode; and judging whether the output in the two modes meets the constraint relation or not according to the judgment, and further judging whether the electromagnetic interference is received or not.
3. An LVDT displacement sensor for identifying electromagnetic interference according to claim 2 wherein: the constraint relationship comprisesWherein, O n and O c are respectively the outputs in the normal mode and the self-checking mode when the movable iron core is displaced, d n and d c are respectively the outputs in the normal mode and the self-checking mode when the movable iron core is not displaced and no electromagnetic interference exists, and k 1 and k 2 are respectively the corresponding calibration curve slopes in the normal mode and the self-checking mode;
If the outputs O n and O c in the normal mode and the self-checking mode meet the constraint relation when the movable iron core is displaced, the electromagnetic interference is judged to be absent, and if the constraint relation is not met, the electromagnetic interference is judged to be present.
4. An electromagnetic interference identification method based on an LVDT displacement sensor capable of identifying electromagnetic interference is characterized by comprising the following steps: the electromagnetic interference identification method comprises the following steps:
The sensor is in a normal mode or a self-checking mode by controlling the opening and closing states of the switching devices M1 and M2 through the first control voltage and the second control voltage, and the corresponding calibration curve slopes k 1 and k 2 in the normal mode and the self-checking mode are obtained;
Acquiring the output d n and d c of the sensor in the normal mode and the self-checking mode when the movable iron core is not displaced and no electromagnetic interference exists;
Acquiring outputs O n and O c of the sensor in a normal mode and a self-checking mode when the movable iron core is displaced;
Whether the sensor is subjected to electromagnetic interference is judged by judging whether the outputs in the two modes meet the constraint relation at the moment.
5. An electromagnetic interference identification method based on an LVDT displacement sensor having identifiable electromagnetic interference according to claim 4, wherein: the controlling the switching states of the switching devices M1 and M2 by the first control voltage and the second control voltage to make the sensor in the normal mode or the self-checking mode specifically includes:
When the first control voltage controls the switching device M1 to be opened and the second control voltage controls the switching device M2 to be closed, a secondary coil connected with the switching device M2 is connected with a signal conditioning circuit, and the sensor is in a normal mode;
when the first control voltage controls the switching device M1 to be closed and the second control voltage controls the switching device M2 to be opened, the secondary coil connected with the switching device M2 is disconnected from the signal conditioning circuit, and the sensor is in a self-checking mode.
6. An electromagnetic interference identification method based on an LVDT displacement sensor having identifiable electromagnetic interference according to claim 4, wherein: the constraint relationship comprisesIf the outputs in the two modes meet the constraint relation, the sensor is judged not to be subjected to electromagnetic interference at the moment, otherwise, the sensor is judged to be subjected to electromagnetic interference.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118500449A (en) * | 2024-05-14 | 2024-08-16 | 北京航空航天大学 | Anti-electromagnetic interference sensor and anti-electromagnetic interference design method |
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2024
- 2024-05-14 CN CN202410594373.XA patent/CN118463787A/en active Pending
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| DE3505765A1 (en) * | 1985-02-20 | 1986-08-21 | Werner Turck Gmbh & Co Kg, 5884 Halver | Inductive proximity switch with a test device |
| CN101714831A (en) * | 2009-06-03 | 2010-05-26 | 崇贸科技股份有限公司 | A startup circuit about a discharging electromagnetic interference filter for power saving for a power supply apparatus |
| WO2013040497A2 (en) * | 2011-09-15 | 2013-03-21 | University Of Washington Through Its Center For Commercialization | Systems and methods for sensing environmental changes using light sources as sensors |
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| Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118500449A (en) * | 2024-05-14 | 2024-08-16 | 北京航空航天大学 | Anti-electromagnetic interference sensor and anti-electromagnetic interference design method |
| CN118500449B (en) * | 2024-05-14 | 2024-11-01 | 北京航空航天大学 | Anti-electromagnetic interference sensor and anti-electromagnetic interference design method |
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