Time domain calibration device and method for lightning pulse electric field sensor

Abstract

The invention provides a time domain calibration device and method for a lightning pulse electric field sensor, and belongs to the technical field of electromagnetic sensing. The time domain calibration device comprises a high-voltage pulse source, a TEM chamber, a high-voltage divider, a photoelectric transmission module and an oscilloscope; a signal output end of the high-voltage pulse source is connected with an input end of the TEM chamber, a first end of the high-voltage divider is connected with an output end of the TEM chamber, and a second end of the high-voltage divider is connected with a first channel of the oscilloscope; the input end of the photoelectric transmission module is connected with the pulsed electric field sensor to be calibrated, the output end of the photoelectric transmission module is connected with the second channel of the oscilloscope, and the pulsed electric field sensor to be calibrated is located in the time domain pulsed field area of the TEM chamber. According to the time domain calibration device of the lightning pulse electric field sensor, the high-voltage pulse source is adopted to generate the mu s-level pulse voltage, the pulse peak power can reach MW or above, the average power is only W-level, time domain calibration is economical and feasible, and time domain calibration of the pulse electric field sensor to be calibrated can be achieved.

Description

Technical Field

[0001] The present invention belongs to the field of electromagnetic sensing technology, and more specifically, relates to a time domain calibration device and method for a lightning pulse electric field sensor, and in particular, relates to a time domain calibration device and method suitable for electric field sensors above kV / m. Background Art

[0002] At present, my country has proposed the requirements and test methods for lightning electromagnetic pulse protection of weapons and equipment. GJB1389A-2005 "System Electromagnetic Compatibility Requirements" states that "for both direct and indirect effects of lightning, the system should meet its working performance requirements. When exposed, after a near lightning strike, or after a direct lightning strike under storage conditions, the ordnance should meet its working performance requirements."

[0003] The accuracy of the measurement results of electromagnetic field measurement sensors will directly affect the protection performance evaluation of weapon systems. Currently, there is no lightning pulse sensor calibration method and standard. Therefore, it is necessary and urgent to design a time domain calibration method for lightning pulse electric field sensors.

[0004] At present, domestic electric field sensors can be traced in the frequency domain, and the measurement units have established a continuous wave field strength standard device of 10kHz to 40GHz, which can meet the calibration needs of frequency domain measurement field sensors. Its maximum field strength is 300kV / m (below 1GHz). At present, the lightning time domain pulse electromagnetic field standard has not been established, so it is difficult to achieve time domain calibration of lightning pulse electric field sensors.

[0005] Pulse electric field sensors not only need to measure the amplitude of high field strengths above kV / m, but also need to measure time domain waveform parameters, including rise time, pulse width and other time domain pulse information. The calibration coefficient obtained by the electric field sensor in the frequency domain represents its narrowband frequency domain response to a specific frequency signal, and cannot fully represent its broadband pulse response to a time domain pulse signal, which will introduce errors when measuring the time domain pulse field strength; at the same time, the linear measurement range of the pulse electric field sensor is generally around 1kV / m to 100kV / m, and the frequency domain 300V / m amplitude calibration cannot meet its high field strength amplitude calibration index requirements. Summary of the invention

[0006] The purpose of the present invention is to provide a time domain calibration device and method for a lightning pulse electric field sensor. The present invention is a time domain calibration method suitable for electric field sensors above kV / m to fill the gap in time domain calibration of lightning pulse electric field sensors and can be used for metrological calibration of pulse electric field sensor products from different manufacturers.

[0007] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a time domain calibration device for a lightning pulse electric field sensor, comprising: a high-voltage pulse source, a TEM chamber (also called a TEM chamber or a transverse electromagnetic wave chamber), a high-voltage voltage divider, an optoelectronic transmission module and an oscilloscope; the signal output end of the high-voltage pulse source is connected to the input end of the TEM chamber, the first end of the high-voltage voltage divider is connected to the output end of the TEM chamber, and the second end of the high-voltage voltage divider is connected to the first channel of the oscilloscope; the input end of the optoelectronic transmission module is connected to the pulse electric field sensor to be calibrated, and the output end is connected to the second channel of the oscilloscope, The pulse electric field sensor to be calibrated is located in the time domain pulse field area of ​​the TEM chamber; the high-voltage pulse source is used to generate a μs-level pulse voltage, the TEM chamber is used to receive the μs-level pulse voltage signal and generate a time domain pulse field, the high-voltage voltage divider is used to divide and attenuate the electromagnetic signal output by the TEM chamber and transmit it to the oscilloscope as a reference signal, the photoelectric transmission module is used to transmit the pulse electric field signal at the position of the pulse electric field sensor to be calibrated to the oscilloscope; the oscilloscope is used to receive the reference signal and the pulse electric field signal at the position of the pulse electric field sensor to be calibrated.

[0008] Furthermore, it also includes a high-voltage matching load, which is connected to the output end of the TEM chamber, and the first end of the high-voltage voltage divider is connected to the high-voltage matching load; the high-voltage matching load is used to absorb the energy of the electromagnetic signal output by the TEM chamber.

[0009] Furthermore, the characteristics of the pulse signal generated by the high-voltage pulse source are: rise time is (0.5±0.05) μs; pulse width is (50±5) μs; output form is single pulse; output voltage amplitude is 0.5 kV to 60 kV.

[0010] Furthermore, the port withstand voltage of the TEM chamber is not less than 60 kV, and the height of the TEM chamber is greater than or equal to three times the height of the pulse electric field sensor to be calibrated.

[0011] Furthermore, the characteristics of the high-voltage voltage divider are: measurement accuracy <3%; characteristic impedance is high resistance; voltage division ratio index is 10000:1; and maximum frequency is 20 MHz.

[0012] Furthermore, the single trigger bandwidth of the oscilloscope is ≥100 MHz; the sampling rate is ≥1 Gs / s; the maximum allowable error of voltage measurement is ±1.5%; and the maximum allowable error of time measurement is ±0.1%.

[0013] Furthermore, the port withstand voltage of the high-voltage matching load is not less than 60 kV, and the impedance of the high-voltage matching load is the same as that of the TEM chamber.

[0014] A second aspect of the present invention provides a method for calibration using the above-mentioned time domain calibration device, comprising the following steps:

[0015] S1. Make the time domain calibration device reach a stable working state;

[0016] S2. Adjust the time and amplitude parameters of the oscilloscope to adapt to the normal display of the measured signal;

[0017] S3, setting the output parameters of the high-voltage pulse source to generate a single pulse, reading the peak value, rise time and pulse width of the output waveform on the first channel of the oscilloscope, and calculating the field strength in the TEM chamber so that the field strength in the TEM chamber reaches more than 1 kV / m;

[0018] S4, placing the pulse electric field sensor to be calibrated at the center of the effective test area of ​​the TEM chamber, so that the polarization direction of the pulse electric field sensor to be calibrated is consistent with the electric field direction;

[0019] S5. Set the output parameters of the high-voltage pulse source again to generate a single pulse, record the peak voltage U1 of the pulse waveform collected by the first channel of the oscilloscope and the peak voltage U2 of the pulse waveform collected by the second channel, and calculate the standard field strength value E in the TEM room and the conversion coefficient K of the pulse electric field sensor to be calibrated;

[0020] S6. Repeat step S5 for multiple times to calculate the average value of the conversion coefficient K of the pulse electric field sensor to be calibrated, and complete the calibration of the conversion coefficient of the pulse electric field sensor to be calibrated at a field strength amplitude of more than 1 kV / m.

[0021] Furthermore, in step S3, the output parameters of the high voltage pulse source are adjusted so that the field strength values ​​in the TEM chamber reach 1 kV / m, 10 kV / m, 50 kV / m, and 100 kV / m, respectively.

[0022] Furthermore, in step S3, the field intensity in the TEM chamber is calculated according to the following formula:

[0023]

[0024] Where, E(t) is the electric field strength in the TEM chamber, kV / m; U1(t) is the peak voltage read in the first channel of the oscilloscope, V; A is the voltage divider ratio of the high-voltage divider; D is the height of the TEM chamber, m;

[0025] The conversion coefficient K of the pulse electric field sensor to be calibrated in step S5 is calculated according to the following formula:

[0026]

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] A time domain calibration device for a lightning pulse electric field sensor of the present invention uses a high-voltage pulse source to generate a μs-level pulse voltage, a TEM chamber receives the μs-level pulse voltage signal and generates a time domain pulse field, and calculates the conversion coefficient of the pulse electric field sensor to be calibrated according to a reference signal received by an oscilloscope, a pulse electric field signal at the position of the pulse electric field sensor to be calibrated and a voltage divider ratio of a high-voltage voltage divider, thereby realizing time domain calibration of the pulse electric field sensor to be calibrated.

[0029] A time domain calibration device for a lightning pulse electric field sensor of the present invention generates a μs-level pulse voltage by adopting a high-voltage pulse source, and its pulse peak power can reach more than MW, and the average power only reaches W level, so that the time domain calibration is low-cost and economically feasible; the time domain calibration device of the present invention can easily realize the time domain calibration of the pulse electric field sensor at a low cost through equipment such as a high-voltage pulse source, a TEM chamber, and a high-voltage voltage divider.

[0030] The time domain calibration device of a lightning pulse electric field sensor of the present invention can absorb the pulse energy of the electromagnetic signal output by the TEM chamber by further setting a high-voltage matching load, so as to suppress or weaken the overshoot, undershoot, ringing and other phenomena in the output pulse waveform, thereby improving the reliability and practicality of the high-voltage pulse source.

[0031] The time domain calibration device and method of a lightning pulse electric field sensor of the present invention can realize 1kV / m-100kV / m high field strength amplitude calibration and can realize time domain waveform response verification of the pulse electric field sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 A schematic diagram of a time domain calibration device for a lightning pulse electric field sensor provided by an embodiment of the present invention;

[0034] Figure 2 A schematic top view of placing a pulse electric field sensor to be calibrated at an effective test center of a TEM chamber provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of placing a pulse electric field sensor to be calibrated in an effective test center of a TEM chamber according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0038] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0039] If the standard electric field of 1kV / m to 100kV / m is to be achieved, the existing frequency domain generation method will require a power amplifier with a power of at least 50MW or more continuous wave power amplifier. The cost of the power amplifier and interconnection equipment such as attenuators (high voltage dividers), TEM chambers (also called TEM chambers or transverse electromagnetic wave chambers) is extremely high and almost impossible to achieve. At the same time, in order to achieve broadband signal calibration, the frequency band range of all frequency domain equipment must at least cover 10kHz to 20MHz. Therefore, it is not economical to use the frequency domain calibration method to achieve high field strength sensor calibration, and it does not meet the actual use requirements.

[0040] For high field strength sensor calibration, the embodiment of the present invention uses pulse power to realize pulse voltage. By using μs-level pulse voltage, its pulse peak power can reach more than MW, and the average power only reaches W level. From the perspective of the entire calibration system, pulse source, TEM chamber, attenuator and other equipment can be easily implemented, and time domain calibration can be achieved at a relatively low cost.

[0041] Therefore, an embodiment of the present invention provides a time domain calibration device for a lightning pulse electric field sensor, such as Figure 1As shown, it includes: a high-voltage pulse source, a TEM chamber, a high-voltage voltage divider, a photoelectric transmission module and an oscilloscope; the signal output end of the high-voltage pulse source is connected to the input end of the TEM chamber, the first end of the high-voltage voltage divider is connected to the output end of the TEM chamber, and the second end of the high-voltage voltage divider is connected to the first channel of the oscilloscope; the input end of the photoelectric transmission module is connected to the pulse electric field sensor to be calibrated (that is, the pulse electric field sensor to be calibrated), and the output end is connected to the second channel of the oscilloscope, and the pulse electric field sensor to be calibrated is located in the time domain pulse field area of ​​the TEM chamber.

[0042] In the time domain calibration device provided in an embodiment of the present invention, a high-voltage pulse source is used to generate a μs-level pulse voltage, a TEM chamber is used to receive a μs-level pulse voltage signal and generate a time domain pulse field, a high-voltage voltage divider is used to divide and attenuate the electromagnetic signal output by the TEM chamber and transmit it to an oscilloscope as a reference signal, and an optoelectronic transmission module is used to transmit the pulse electric field signal at the position of a pulse electric field sensor to be calibrated to the oscilloscope; the oscilloscope is used to receive the reference signal and the pulse electric field signal at the position of the pulse electric field sensor to be calibrated.

[0043] When in use, a time domain calibration device for a lightning pulse electric field sensor according to an embodiment of the present invention places the pulse electric field sensor to be calibrated in the time domain pulse field environment of a TEM chamber, and obtains its time domain pulse response characteristics according to the field strength signal received by the pulse electric field sensor. Specifically, a lightning high voltage pulse source generates a high voltage pulse waveform, and generates a uniform pulse field in the TEM chamber, which can be used as a standard field to calibrate the pulse electric field sensor. The direction of the pulse field is perpendicular to the middle core plate of the TEM chamber, and its waveform is consistent with the output voltage waveform of the time domain pulse generator.

[0044] In an embodiment of the present invention, a pulse electric field sensor to be calibrated is placed in a pulse field area of ​​a TEM chamber. When the system is working, a pulse signal is generated by a high-voltage pulse source, and the pulse signal is fed into an input port of the TEM chamber. An output port of the TEM chamber is connected to a channel of an oscilloscope through a high-voltage voltage divider as a reference signal. The pulse electric field sensor to be calibrated senses the pulse field and enters another channel of the oscilloscope through an optoelectronic transmission module.

[0045] According to the reference signal received by the oscilloscope and the attenuation of the high-voltage voltage divider, the output amplitude of the high-voltage pulse source can be obtained, thereby calculating the pulse electric field intensity amplitude at the position where the calibrated pulse electric field sensor is placed; and the signal voltage amplitude of the calibrated pulse electric field sensor after passing through the photoelectric transmission module and entering the oscilloscope can be directly obtained, and it is calculated with the field strength value at the position of the pulse electric field sensor to obtain the conversion coefficient of the calibrated pulse electric field sensor; at the same time, by comparing and analyzing the radiated electric field waveform at the position of the pulse electric field sensor with the output voltage waveform of the high-voltage pulse source, the measured time domain pulse waveform of the calibrated pulse electric field sensor can be obtained, that is, the time domain pulse response characteristics of the calibrated pulse electric field sensor can be obtained.

[0046] Furthermore, a time domain calibration device for a lightning pulse electric field sensor according to an embodiment of the present invention further includes a high-voltage matching load, which is connected to the output end of the TEM chamber, and the first end of the high-voltage voltage divider is connected to the high-voltage matching load. The high-voltage matching load is used to absorb the pulse energy of the electromagnetic signal output by the TEM chamber to suppress or weaken the overshoot, undershoot, ringing and other phenomena in the output pulse waveform, thereby improving the reliability and practicality of the high-voltage pulse source.

[0047] The performance of each device used in the embodiment of the present invention is as follows:

[0048] The characteristics of the pulse signal generated by the high-voltage pulse source are: rise time is (0.5±0.05) μs; pulse width is (50±5) μs; output form is single pulse; output voltage amplitude is 0.5 kV to 60 kV.

[0049] The port withstand voltage of the TEM chamber is not less than 60 kV, and the height of the TEM chamber is greater than or equal to three times the height of the pulse electric field sensor to be calibrated.

[0050] The characteristics of the high voltage divider are: measurement accuracy <3%; characteristic impedance is high resistance; voltage division ratio index is 10000:1; maximum frequency is 20MHz.

[0051] The port withstand voltage of the high-voltage matching load is not less than 60kV, and the impedance of the high-voltage matching load is the same as that of the TEM chamber.

[0052] The single trigger bandwidth of the oscilloscope is ≥100MHz; the sampling rate is ≥1Gs / s; the maximum allowable error of voltage measurement is ±1.5%; the maximum allowable error of time measurement is ±0.1%.

[0053] A time domain calibration device for a lightning pulse electric field sensor in an embodiment of the present invention uses a high-voltage pulse source to generate a μs-level pulse voltage. A TEM chamber receives the μs-level pulse voltage signal and generates a time domain pulse field. The conversion coefficient of the pulse electric field sensor to be calibrated is calculated based on a reference signal received by an oscilloscope, a pulse electric field signal at the position of the pulse electric field sensor to be calibrated, and a voltage divider ratio of a high-voltage voltage divider, thereby realizing time domain calibration of the pulse electric field sensor to be calibrated.

[0054] A time domain calibration device for a lightning pulse electric field sensor in an embodiment of the present invention generates a μs-level pulse voltage by using a high-voltage pulse source, and its pulse peak power can reach more than MW, and the average power only reaches W level, making the time domain calibration low-cost and economically feasible; the time domain calibration device in an embodiment of the present invention can easily realize the time domain calibration of the pulse electric field sensor at a low cost through equipment such as a high-voltage pulse source, a TEM chamber, and a high-voltage voltage divider.

[0055] The embodiment of the present invention further provides a method for calibration using the above-mentioned time domain calibration device, comprising the following steps:

[0056] S1, press Figure 1 Connect the device and preheat it according to the instrument manual to make the time domain calibration device reach a stable working state;

[0057] S2. Properly adjust the oscilloscope time and amplitude parameters to adapt to the normal display of the measured signal;

[0058] S3, setting the output parameters of the high-voltage pulse source to generate a single pulse, reading the peak value, rise time and pulse width of the output waveform on the first channel of the oscilloscope, and calculating the field intensity in the TEM chamber according to formula (1), and adjusting the output parameters of the high-voltage pulse source so that the field intensity in the TEM chamber reaches 1 kV / m, 10 kV / m, 50 kV / m, and 100 kV / m respectively;

[0059] Formula (1):

[0060] Where E(t) is the electric field strength in the TEM chamber, kV / m; U1(t) is the peak voltage read in the first channel of the oscilloscope, V; A is the voltage divider ratio of the high-voltage divider; and D is the height of the TEM chamber, m.

[0061] S4. Place the pulse electric field sensor to be calibrated in the center of the effective test area of ​​the TEM chamber, such as Figure 2 , Figure 3 As shown, the polarization direction of the pulse electric field sensor to be calibrated is consistent with the electric field direction, and the pulse electric field sensor to be calibrated is ensured to be in the middle of the effective test area;

[0062] S5, setting the output parameters of the high-voltage pulse source again to generate a single pulse, recording the peak voltage U1 of the pulse waveform collected by the first channel of the oscilloscope and the peak voltage U2 of the pulse waveform collected by the second channel, and calculating the standard field strength value E in the TEM room according to formula (1), and calculating the conversion coefficient K of the pulse electric field sensor to be calibrated according to formula (2);

[0063] Formula (2):

[0064] Wherein, K is the conversion coefficient of the pulse electric field sensor to be calibrated, (kV / m) / mV; U2 is the peak voltage of the pulse waveform collected by the second channel of the oscilloscope, mV.

[0065] S6. Repeat step S5 multiple times, for example, 3 times, to calculate the average value of the conversion coefficient K of the pulse electric field sensor to be calibrated, and complete the calibration of the conversion coefficient of the pulse electric field sensor to be calibrated within the field strength range of 1 kV / m to 100 kV / m.

[0066] A time domain calibration method for a lightning pulse electric field sensor in an embodiment of the present invention is suitable for time domain calibration of lightning μs-level pulse field strength, can realize metrological calibration of 1kV / m to 100kV / m high field strength conversion coefficients, and can realize verification of the time domain waveform response of the pulse electric field sensor.

[0067] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A time domain calibration device for a lightning pulse electric field sensor, characterized in that: include: High voltage pulse source, TEM chamber, high voltage divider, optoelectronic transmission module and oscilloscope; The signal output end of the high-voltage pulse source is connected to the input end of the TEM chamber, the first end of the high-voltage voltage divider is connected to the output end of the TEM chamber, and the second end of the high-voltage voltage divider is connected to the first channel of the oscilloscope; the input end of the photoelectric transmission module is connected to the pulse electric field sensor to be calibrated, and the output end is connected to the second channel of the oscilloscope, and the pulse electric field sensor to be calibrated is located in the time domain pulse field area of ​​the TEM chamber; The high-voltage pulse source is used to generate a μs-level pulse voltage, the TEM chamber is used to receive the μs-level pulse voltage signal and generate a time-domain pulse field, the high-voltage voltage divider is used to divide and attenuate the electromagnetic signal output by the TEM chamber and transmit it to the oscilloscope as a reference signal, and the photoelectric transmission module is used to transmit the pulse electric field signal at the position of the pulse electric field sensor to be calibrated to the oscilloscope; The oscilloscope is used to receive the reference signal and the pulse electric field signal at the position of the pulse electric field sensor to be calibrated.

2. The time domain calibration device for a lightning pulse electric field sensor according to claim 1, characterized in that: It also includes a high-voltage matching load, which is connected to the output end of the TEM chamber, and the first end of the high-voltage voltage divider is connected to the high-voltage matching load; the high-voltage matching load is used to absorb the energy of the electromagnetic signal output by the TEM chamber.

3. A time domain calibration device for a lightning pulse electric field sensor as claimed in claim 1 or 2, characterized in that: The characteristics of the pulse signal generated by the high-voltage pulse source are: rise time is (0.5±0.05) μs; pulse width is (50±5) μs; output form is single pulse; output voltage amplitude is 0.5 kV to 60 kV.

4. A time domain calibration device for a lightning pulse electric field sensor as claimed in claim 1 or 2, characterized in that: The port withstand voltage of the TEM chamber is not less than 60 kV, and the height of the TEM chamber is greater than or equal to three times the height of the pulse electric field sensor to be calibrated.

5. A time domain calibration device for a lightning pulse electric field sensor as claimed in claim 1 or 2, characterized in that: The characteristics of the high-voltage voltage divider are: measurement accuracy <3%; characteristic impedance is high resistance; voltage division ratio index is 10000:1; and maximum frequency is 20MHz.

6. A time domain calibration device for a lightning pulse electric field sensor as claimed in claim 1 or 2, characterized in that: The single trigger bandwidth of the oscilloscope is ≥100MHz; the sampling rate is ≥1Gs / s; the maximum allowable error of voltage measurement is ±1.5%; and the maximum allowable error of time measurement is ±0.1%.

7. The time domain calibration device for a lightning pulse electric field sensor according to claim 2, characterized in that: The port withstand voltage of the high-voltage matching load is not less than 60 kV, and the impedance of the high-voltage matching load is the same as that of the TEM chamber.

8. A method for calibration using the time domain calibration device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Make the time domain calibration device reach a stable working state; S2. Adjust the time and amplitude parameters of the oscilloscope to adapt to the normal display of the measured signal; S3, setting the output parameters of the high-voltage pulse source to generate a single pulse, reading the peak value, rise time and pulse width of the output waveform on the first channel of the oscilloscope, and calculating the field intensity in the TEM chamber so that the field intensity in the TEM chamber reaches more than 1 kV / m; S4, placing the pulse electric field sensor to be calibrated at the center of the effective test area of ​​the TEM chamber, so that the polarization direction of the pulse electric field sensor to be calibrated is consistent with the electric field direction; S5. Set the output parameters of the high-voltage pulse source again to generate a single pulse, record the peak voltage U1 of the pulse waveform collected by the first channel of the oscilloscope and the peak voltage U2 of the pulse waveform collected by the second channel, and calculate the standard field strength value E in the TEM room and the conversion coefficient K of the pulse electric field sensor to be calibrated; S6. Repeat step S5 for multiple times to calculate the average value of the conversion coefficient K of the pulse electric field sensor to be calibrated, and complete the calibration of the conversion coefficient of the pulse electric field sensor to be calibrated at a field strength amplitude of more than 1 kV / m.

9. The method according to claim 8, characterized in that In step S3, the output parameters of the high voltage pulse source are adjusted so that the field strength values ​​in the TEM chamber reach 1 kV / m, 10 kV / m, 50 kV / m, and 100 kV / m, respectively.

10. The method according to claim 8, characterized in that The field intensity in the TEM chamber in step S3 is calculated according to the following formula: Where, E(t) is the electric field strength in the TEM chamber, kV / m; U1(t) is the peak voltage read in the first channel of the oscilloscope, V; A is the voltage divider ratio of the high-voltage divider; D is the height of the TEM chamber, m; The conversion coefficient K of the pulse electric field sensor to be calibrated in step S5 is calculated according to the following formula:

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