Total field strength calculation circuit based on triode and omnidirectional strong electromagnetic pulse field sensor

Abstract

The present invention provides a total field strength calculation circuit based on a triode and an omnidirectional strong electromagnetic pulse field sensor, wherein the total field strength calculation circuit based on a triode comprises a reference voltage adjustment operational amplifier A1, a reference voltage adjustment resistor R1, a balancing capacitor C1, voltage-current conversion triodes T1, T2, T3, balancing resistors R2, R3, R4, 1# voltage-dividing adjustment resistors R5, R7, R9, 2# voltage-dividing adjustment resistors R6, R8, R10, a temperature balance adjustment triode T4, a signal conversion adjustment operational amplifier A2, and a current-voltage conversion resistor R11. The present invention only requires a single optical fiber channel to realize the transmission of a test signal, has low requirements on a back-end acquisition device, and the test system formed is simple and low in cost; and can realize omnidirectional testing in a high-frequency strong electromagnetic pulse environment of several GHz, and the sensor has a wider application range.

Description

Technical Field

[0001] The invention relates to the technical field of strong electromagnetic pulse testing, and in particular to a triode-based total field strength calculation circuit and an omnidirectional strong electromagnetic pulse field sensor. Background Art

[0002] In recent years, with the increasing demand for space strong electromagnetic pulse environment monitoring, the attention and importance of omnidirectional strong electromagnetic pulse field sensors have been increasing. They can not only accurately perceive the strong electromagnetic pulse environment in any direction and polarization direction, but also the test results are not affected by the placement posture. They can meet the test needs of strong electromagnetic pulse environments with unknown directions and unknown polarization directions, and have broad application prospects. The main structure of the omnidirectional strong electromagnetic pulse sensor includes components such as orthogonal axial electric field component induction pole antenna, induction signal processing circuit, and electro-optical modulation device; among them, the induction signal processing circuit is the most critical link in the omnidirectional strong electromagnetic pulse sensor, and its performance often determines the important index parameters of the sensor such as the test frequency, test pulse width, and response time. Therefore, it is the key design object of the omnidirectional strong electromagnetic pulse field sensor.

[0003] At present, in the publicly reported three-dimensional active electro-optical sensors for omnidirectional testing in strong electromagnetic pulse environments, direct electro-optical modulation circuits are mainly used to process the three-way axial (X-axis, Y-axis and Z-axis) electric field component sensing signals of the sensor, directly convert them into three-way optical fiber signals for transmission, and collect and process them at the receiving end to obtain the total field strength in space. Although the working principle of this sensor based on direct electro-optical modulation circuit is simple, it has obvious defects in actual use: first, the direct electro-optical modulation circuit not only requires three electro-optical modulation devices to complete the electro-optical conversion of the three-way sensing signals, but also requires corresponding equalization circuits to ensure the consistency of the three electro-optical modulation devices, and the circuit power consumption is large and complex; second, the direct electro-optical modulation circuit outputs three-way signals, requiring three independent channels to transmit the test signals, and the acquisition equipment is required to have three independent receiving ports to complete the reception and collection of all test signals; finally, the test frequency of the sensor based on this circuit is limited by the frequency of the electro-optical device (generally within 1GHz), which makes it difficult for the sensor to achieve strong electromagnetic pulse environment testing above 1GHz, limiting its practical application. Summary of the invention

[0004] The present invention aims to provide a total field strength calculation circuit based on triode and an omnidirectional strong electromagnetic pulse field sensor to solve the problems existing in the existing direct electro-optical modulation circuit and its applied three-dimensional active electro-optical sensor for omnidirectional testing in a strong electromagnetic pulse environment.

[0005] The present invention provides a total field strength calculation circuit based on transistors, comprising a reference voltage adjustment operational amplifier A1, a reference voltage adjustment resistor R1, a balancing capacitor C1, a voltage-current conversion transistor T1, a voltage-current conversion transistor T2, a voltage-current conversion transistor T3, a balancing resistor R2, a balancing resistor R3, a balancing resistor R4, a 1# voltage-dividing adjustment resistor R5, a 1# voltage-dividing adjustment resistor R7, a 1# voltage-dividing adjustment resistor R9, a 2# voltage-dividing adjustment resistor R6, a 2# voltage-dividing adjustment resistor R8, a 2# voltage-dividing adjustment resistor R10, a temperature balance adjustment transistor T4, a signal conversion adjustment operational amplifier A2, and a current-voltage conversion resistor R11;

[0006] The in-phase end of the reference voltage regulating operational amplifier A1 is grounded; the inverting end of the reference voltage regulating operational amplifier A1 is connected to the reference voltage via the reference voltage regulating resistor R1, and the maximum output voltage of the total field strength calculation circuit can be adjusted by adjusting the reference voltage and the reference voltage regulating resistor R1, so that the output voltage of the circuit is within a reasonable dynamic range; the inverting end of the reference voltage regulating operational amplifier A1 is connected to the collectors of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 respectively; the output end of the reference voltage regulating operational amplifier A1 is connected to its inverting end via the balancing capacitor C1, and is connected to the emitter of the voltage-current conversion transistor T1 via the balancing resistor R2, connected to the emitter of the voltage-current conversion transistor T2 via the balancing resistor R3, and connected to the collector of the voltage-current conversion transistor T3 via the balancing resistor R4. The emitter of transistor T3; the base of voltage-current conversion transistor T1 is connected to a detection signal input terminal through 1# voltage-dividing regulating resistor R5 on the one hand, and is grounded through 2# voltage-dividing regulating resistor R6 on the other hand; the base of voltage-current conversion transistor T2 is connected to a detection signal input terminal through 1# voltage-dividing regulating resistor R7 on the one hand, and is grounded through 2# voltage-dividing regulating resistor R8 on the other hand; the base of voltage-current conversion transistor T3 is connected to a detection signal input terminal through 1# voltage-dividing regulating resistor R9 on the one hand, and is grounded through 2# voltage-dividing regulating resistor R10 on the other hand; the 3-way detection voltage signals enter the corresponding voltage-current conversion transistor T1, voltage-current conversion transistor T2, and voltage-current conversion transistor T3 through detection signal input terminal b1, detection signal input terminal b2, and detection signal input terminal b3 respectively, and are converted from voltage signals to current signals in the form of exponential relationship;

[0007] The emitters of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 are all connected to the emitter of the temperature balance adjustment transistor T4; the base of the temperature balance adjustment transistor T4 is grounded; the inverting end of the signal conversion and adjustment operational amplifier A2 is connected to the collector of the temperature balance adjustment transistor T4 on the one hand, and is connected to the output end of the signal conversion and adjustment operational amplifier A2 through the current-voltage conversion resistor R11 on the other hand; the non-inverting end of the signal conversion and adjustment operational amplifier A2 is grounded.

[0008] Furthermore, the resistance values ​​of the 1# voltage-dividing regulating resistor R5, 1# voltage-dividing regulating resistor R7 and 1# voltage-dividing regulating resistor R9 are R α The resistance values ​​of the 2# voltage-dividing regulating resistors R6, R8 and R10 are R β , R α , R β The following conditions are met:

[0009]

[0010] Where, l is the slope of the detection curve, in V / dB; R α , R β The unit is Ω.

[0011] Furthermore, the voltage-current conversion transistor T1, the voltage-current conversion transistor T2, the voltage-current conversion transistor T3 and the temperature balance adjustment transistor T4 all adopt the same type of NPN transistor.

[0012] Furthermore, the 2# voltage-dividing regulating resistor R6, the 2# voltage-dividing regulating resistor R8 and the 2# voltage-dividing regulating resistor R10 are all PTC thermistors.

[0013] Furthermore, the temperature coefficient of the 2# voltage-dividing regulating resistor R6, the 2# voltage-dividing regulating resistor R8 and the 2# voltage-dividing regulating resistor R10 is 3300 PPM.

[0014] The present invention also provides an omnidirectional strong electromagnetic pulse field sensor, comprising: a metal shielding shell, three axial sensing antennas, a signal processing module, a laser module, an optical fiber and a power supply; the signal processing module comprises three axial voltage signal detection units and the total field strength calculation circuit based on the triode as described above;

[0015] The three axial sensing antennas are all arranged outside the metal shielding shell and are perpendicular to each other; the three axial voltage signal detection units, the total field strength calculation circuit, the laser module and the power supply are arranged inside the metal shielding shell; the three axial sensing antennas are respectively connected to the three detection signal input ends of the total field strength calculation circuit via the three axial voltage signal detection units; the output end of the signal conversion and regulation operational amplifier A2 of the total field strength calculation circuit is connected to the laser module and the optical fiber in turn; and the surface of the metal shielding shell is provided with three antenna vias for connecting the three axial sensing antennas and the three axial voltage signal detection units and one optical fiber via for connecting the laser module and the optical fiber;

[0016] The metal shielding shell is used to shield and protect the signal processing module, the laser module and the power supply;

[0017] The three axial sensing antennas are used to sense axial strong electromagnetic pulse field signal components and convert the sensed axial strong electromagnetic pulse field signal components into axial voltage signals;

[0018] In the signal processing module, three axial voltage signal detection units are used to detect the axial voltage signals output by the three axial induction antennas to extract detection signals; the total field strength calculation circuit is used to complete the vector synthesis of the axial strong electromagnetic pulse field signal components to obtain the spatial field strength signal;

[0019] The laser module is used to convert the spatial field intensity signal obtained by the signal processing module into an optical signal and transmit it externally through an optical fiber;

[0020] The power supply is used to provide the signal processing module and the laser module with energy required for normal operation.

[0021] Furthermore, the axial voltage signal detection units all use logarithmic detectors to extract the axial voltage signal of the axial induction antenna in a logarithmic detection manner.

[0022] Furthermore, the axial induction antenna is a monopole electrically small antenna.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The total field strength calculation circuit of the present invention is small and compact and can be integrated into the sensor to realize the synthetic calculation of the three axial electric field components at the sensor end to the total field strength. The omnidirectional strong electromagnetic pulse field sensor only needs one electro-optical modulation device to complete the photoelectric conversion of the test signal, and does not require a complex balancing control circuit to adjust the consistency of multiple electro-optical modulation devices. The circuit is simple and the power consumption is low.

[0025] 2. The omnidirectional strong electromagnetic pulse field sensor of the present invention outputs a total field intensity optical signal. Only one optical fiber channel is needed to complete the transmission of the spatial total field intensity test signal, and the back-end acquisition device only needs one acquisition port to complete the test signal reception and acquisition. The test system thus constructed is simple and low-cost.

[0026] 3. The omnidirectional strong electromagnetic pulse field sensor of the present invention directly outputs the total field strength information in space, without the need for complex back-end calculation processing, and the test results are intuitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of a total field strength calculation circuit based on a triode provided in Example 1 of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of an omnidirectional strong electromagnetic pulse field sensor provided in Example 2 of the present invention.

[0030] Figure 3 This is a connection diagram of the axial sensing antenna, the axial voltage signal detection unit, the triode-based total field strength calculation circuit and the laser module in the omnidirectional strong electromagnetic pulse field sensor provided in Example 2 of the present invention.

[0031] Figure 4 This is a circuit schematic diagram of a laser module in an omnidirectional strong electromagnetic pulse field sensor provided in Example 2 of the present invention.

[0032] Figure 5 This is a circuit schematic diagram of an axial voltage signal detection unit in an omnidirectional strong electromagnetic pulse field sensor provided in Example 2 of the present invention.

[0033] Icons: 1-metal shielding shell, 21-X-axial sensing antenna, 22-Y-axial sensing antenna, 23-Z-axial sensing antenna, 31-X-axial voltage signal detection circuit, 32-Y-axial voltage signal detection circuit, 33-Z-axial voltage signal detection circuit, 4-total field strength calculation circuit based on transistor, 5-laser module, 6-optical fiber, 7-power supply. DETAILED DESCRIPTION

[0034] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment proposes a total field strength calculation circuit based on a transistor, including a reference voltage adjustment operational amplifier A1, a reference voltage adjustment resistor R1, a balancing capacitor C1, a voltage-current conversion transistor T1, a voltage-current conversion transistor T2, a voltage-current conversion transistor T3, a balancing resistor R2, a balancing resistor R3, a balancing resistor R4, a 1# voltage-dividing adjustment resistor R5, a 1# voltage-dividing adjustment resistor R7, a 1# voltage-dividing adjustment resistor R9, a 2# voltage-dividing adjustment resistor R6, a 2# voltage-dividing adjustment resistor R8, a 2# voltage-dividing adjustment resistor R10, a temperature balance adjustment transistor T4, a signal conversion adjustment operational amplifier A2, and a current-voltage conversion resistor R11;

[0038] The in-phase end of the reference voltage regulating operational amplifier A1 is grounded; the inverting end of the reference voltage regulating operational amplifier A1 is connected to the reference voltage via the reference voltage regulating resistor R1, and the maximum output voltage of the total field strength calculation circuit can be adjusted by adjusting the reference voltage and the reference voltage regulating resistor R1, so that the output voltage of the circuit is within a reasonable dynamic range; the inverting end of the reference voltage regulating operational amplifier A1 is connected to the collectors of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 respectively; the output end of the reference voltage regulating operational amplifier A1 is connected to its inverting end via the balancing capacitor C1, and is connected to the emitter of the voltage-current conversion transistor T1 via the balancing resistor R2, connected to the emitter of the voltage-current conversion transistor T2 via the balancing resistor R3, and connected to the collector of the voltage-current conversion transistor T3 via the balancing resistor R4. 3; the base of the voltage-current conversion transistor T1 is connected to a detection signal input terminal b1 through the 1# voltage-dividing regulating resistor R5 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R6 on the other hand; the base of the voltage-current conversion transistor T2 is connected to a detection signal input terminal b2 through the 1# voltage-dividing regulating resistor R7 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R8 on the other hand; the base of the voltage-current conversion transistor T3 is connected to a detection signal input terminal b3 through the 1# voltage-dividing regulating resistor R9 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R10 on the other hand; the 3-way detection voltage signals enter the corresponding voltage-current conversion transistor T1, voltage-current conversion transistor T2, and voltage-current conversion transistor T3 through the detection signal input terminal b1, the detection signal input terminal b2, and the detection signal input terminal b3 respectively, and are converted from voltage signals to current signals in the form of exponential relationship;

[0039] The emitters of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 are all connected to the emitter of the temperature balance adjustment transistor T4, so that the temperature balance adjustment transistor T4 forms a pair relationship with the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3, which is used to eliminate the influence of temperature on the transistor current; the base of the temperature balance adjustment transistor T4 is grounded; the inverting end of the signal conversion and adjustment operational amplifier A2 is connected to the collector of the temperature balance adjustment transistor T4 on the one hand to form a signal conversion and adjustment circuit, which is used to convert the output current of the temperature balance adjustment transistor T4 into a total field strength signal voltage, and is connected to the output end c of the signal conversion and adjustment operational amplifier A2 through the current-voltage conversion resistor R11 on the other hand; the inverting end of the signal conversion and adjustment operational amplifier A2 is grounded.

[0040] Furthermore, the resistance values ​​of the 1# voltage-dividing regulating resistor R5, 1# voltage-dividing regulating resistor R7 and 1# voltage-dividing regulating resistor R9 are R αThe resistance values ​​of the 2# voltage-dividing regulating resistors R6, R8 and R10 are R β , R α , R β The following conditions are met:

[0041]

[0042] Where, l is the slope of the detection curve, in V / dB; R α , R β The unit is Ω. That is, the 1# voltage-dividing regulating resistor R5, 1# voltage-dividing regulating resistor R7 and 1# voltage-dividing regulating resistor R9, the 2# voltage-dividing regulating resistor R6, 2# voltage-dividing regulating resistor R8 and 2# voltage-dividing regulating resistor R10 constitute three voltage proportional regulating units, which are used to specify the proportional regulation of the detection signals of the X-axis, Y-axis and Z-axis axial voltage signals input by the detection signal input terminals b1, b2 and b3.

[0043] Furthermore, the 2# voltage-dividing regulating resistors R6, R8 and R10 are all PTC thermistors. In this embodiment, the temperature coefficient is preferably 3300 PPM, which is used to compensate for the influence of the ambient temperature on the calculation circuit.

[0044] Furthermore, the voltage-current conversion transistor T1, the voltage-current conversion transistor T2, the voltage-current conversion transistor T3 and the temperature balance adjustment transistor T4 all use the same type of NPN transistor, such as the NPN transistor of type 2SC3906K.

[0045] Example 2

[0046] like Figure 2 , Figure 3 As shown, this embodiment provides an omnidirectional strong electromagnetic pulse field sensor for realizing omnidirectional testing of a narrowband high-power microwave environment with a frequency of 1 to 10 GHz. The omnidirectional strong electromagnetic pulse field sensor includes: a metal shielding shell 1, three axial sensing antennas (X-axis sensing antenna 21, Y-axis sensing antenna 22, Z-axis sensing antenna 23), a signal processing module, a laser module 5, an optical fiber 6 and a power supply 7; the signal processing module includes three axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33) and a total field strength calculation circuit 4 based on a triode as described in Example 1;

[0047] The three axial induction antennas (X-axis induction antenna 21, Y-axis induction antenna 22, Z-axis induction antenna 23) are all arranged outside the metal shielding shell 11 and are perpendicular to each other; the three axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33), the total field strength calculation circuit 4, the laser module 5 and the power supply 7 are arranged inside the metal shielding shell 1; the three axial induction antennas (X-axis induction antenna 21, Y-axis induction antenna 22, Z-axis induction antenna 23) are respectively detected by the three axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33) 32, Z-axis voltage signal detection unit 33) are connected to the three detection signal input terminals (b1, b2, b3) of the total field strength calculation circuit; the output terminal c of the signal conversion and adjustment operational amplifier A2 of the total field strength calculation circuit 4 is connected to the laser module 5 and the optical fiber 6 in sequence; and the surface of the metal shielding shell 1 is provided with three antenna vias for connecting the three axial sensing antennas (X-axis sensing antenna 21, Y-axis sensing antenna 22, Z-axis sensing antenna 23) and the three axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33) and one optical fiber via for connecting the laser module 5 and the optical fiber 6;

[0048] The metal shielding shell 1 is used to shield and protect the signal processing module, the laser module 5 and the power supply 7;

[0049] The three axial sensing antennas (X-axial sensing antenna 21, Y-axial sensing antenna 22, and Z-axial sensing antenna 23) are used to sense axial strong electromagnetic pulse field signal components and convert the sensed axial strong electromagnetic pulse field signal components into axial voltage signals;

[0050] In the signal processing module, three axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33) are used to detect the axial voltage signals output by three axial sensing antennas (X-axis sensing antenna 21, Y-axis sensing antenna 22, Z-axis sensing antenna 23) and extract detection signals; the total field strength calculation circuit 4 is used to complete the vector synthesis of the axial strong electromagnetic pulse field signal components to obtain the spatial field strength signal;

[0051] like Figure 4The figure shows an embodiment of the laser module 5, which should not be used to limit the present invention. The laser module 5 includes a diode D1, an operational amplifier A3, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a transistor T5, a laser P1 and a capacitor C2; the in-phase end of the operational amplifier A3 is grounded via the resistor R13 on the one hand, and is connected to the power supply Vcc via the positive and negative electrodes of the diode D1 in sequence on the other hand; the base of the transistor T5 is connected to the output end of the operational amplifier A3 via the resistor R14; the collector of the transistor T5 is connected to the inverting end of the operational amplifier A3 on the one hand, and is connected to the power supply Vcc via the resistor R14 on the other hand; the emitter of the transistor T1 is grounded via the laser P1 and the resistor R15 on the one hand, and is connected to the output end c of the laser module 5 via the laser P1 and the capacitor C2 in sequence on the other hand. When the laser module 5 is working, on the one hand, a stable voltage difference is formed across the resistor R15 through the clamping voltage of the diode D1 and the negative feedback of the operational amplifier A3, that is, a stable laser threshold operating current is generated, so that the laser P1 works stably; on the other hand, the spatial field intensity signal is loaded to the laser P1 through the c end in an AC loading manner, and on the other hand, the spatial field intensity signal is loaded to the laser P1 in an AC manner through the capacitor C2, and the output optical signal of the laser P1 is modulated, thereby realizing the conversion of the spatial field intensity signal from an electrical signal to an optical signal, and emitting and transmitting it to the outside through the optical fiber 6.

[0052] The power supply 7 is used to provide the signal processing module and the laser module 5 with energy required for normal operation.

[0053] Furthermore, the axial voltage signal detection units (X-axis voltage signal detection unit 31, Y-axis voltage signal detection unit 32, Z-axis voltage signal detection unit 33) all use logarithmic detectors (such as a logarithmic detector of model AD8317, with a detection curve slope l=0.022V / dB), such as Figure 5 The axial voltage signal detection unit is shown as an embodiment, which should not be used to limit the present invention; the axial voltage signal detection unit includes a resistor R16, a capacitor C3, a capacitor C4 and a logarithmic detector AD8317, and the input end (i.e. Figure 5The a1, a2, and a3 shown in the figure are grounded via resistor R16 on the one hand, and connected to the INHI terminal of the logarithmic detector ADL5513 via capacitor C3 on the other hand; the INLO port of the logarithmic detector AD8317 is grounded via capacitor C4, the COMM port and the CLPF port are grounded, the VPOS port is connected to the power supply Vcc, and the VSET port is connected to the VOUT port; the axial voltage signals of the X-axis sensing antenna 21, the Y-axis sensing antenna 22, and the Z-axis sensing antenna 23 enter the logarithmic detector AD8317 of the X-axis voltage signal detection unit 31, the Y-axis voltage signal detection unit 32, and the Z-axis voltage signal detection unit 33 through ports a1, a2, and a3, respectively, for logarithmic detection, and output corresponding logarithmic detection signals through ports b1, b2, and b3.

[0054] Furthermore, the axial sensing antennas (X-axial sensing antenna 21, Y-axial sensing antenna 22, Z-axial sensing antenna 23) are monopole electric small antennas.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A total field strength calculation circuit based on triode, characterized in that: Including reference voltage adjustment operational amplifier A1, reference voltage adjustment resistor R1, balancing capacitor C1, voltage-current conversion transistor T1, voltage-current conversion transistor T2, voltage-current conversion transistor T3, balancing resistor R2, balancing resistor R3, balancing resistor R4, 1# voltage-dividing adjustment resistor R5, 1# voltage-dividing adjustment resistor R7, 1# voltage-dividing adjustment resistor R9, 2# voltage-dividing adjustment resistor R6, 2# voltage-dividing adjustment resistor R8, 2# voltage-dividing adjustment resistor R10, temperature balance adjustment transistor T4, signal conversion adjustment operational amplifier A2 and current-voltage conversion resistor R11; The in-phase end of the reference voltage regulating operational amplifier A1 is grounded; the inverting end of the reference voltage regulating operational amplifier A1 is connected to the reference voltage via the reference voltage regulating resistor R1 on the one hand; the inverting end of the reference voltage regulating operational amplifier A1 is respectively connected to the collectors of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 on the other hand; the output end of the reference voltage regulating operational amplifier A1 is connected to its inverting end via the balancing capacitor C1 on the one hand, and is connected to the emitter of the voltage-current conversion transistor T1 via the balancing resistor R2 and the emitter of the voltage-current conversion transistor T3 via the balancing resistor R3. The emitter of the voltage-current conversion transistor T2 is connected to the emitter of the voltage-current conversion transistor T3 through the balancing resistor R4; the base of the voltage-current conversion transistor T1 is connected to a detection signal input terminal through the 1# voltage-dividing regulating resistor R5 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R6 on the other hand; the base of the voltage-current conversion transistor T2 is connected to a detection signal input terminal through the 1# voltage-dividing regulating resistor R7 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R8 on the other hand; the base of the voltage-current conversion transistor T3 is connected to a detection signal input terminal through the 1# voltage-dividing regulating resistor R9 on the one hand, and is grounded through the 2# voltage-dividing regulating resistor R10 on the other hand; The emitters of the voltage-current conversion transistor T1, the voltage-current conversion transistor T2 and the voltage-current conversion transistor T3 are all connected to the emitter of the temperature balance adjustment transistor T4; the base of the temperature balance adjustment transistor T4 is grounded; the inverting end of the signal conversion and adjustment operational amplifier A2 is connected to the collector of the temperature balance adjustment transistor T4 on the one hand, and is connected to the output end of the signal conversion and adjustment operational amplifier A2 through the current-voltage conversion resistor R11 on the other hand; the non-inverting end of the signal conversion and adjustment operational amplifier A2 is grounded.

2. The total field strength calculation circuit based on triode according to claim 1, characterized in that: The resistance values ​​of the 1# voltage-dividing regulating resistors R5, R7 and R9 are R α The resistance values ​​of the 2# voltage-dividing regulating resistors R6, R8 and R10 are R β , R α , R β The following conditions are met: Where, l is the slope of the detection curve, in V / dB; R α , R β The unit is Ω.

3. The total field strength calculation circuit based on triode according to claim 1, characterized in that: The voltage-current conversion transistor T1, the voltage-current conversion transistor T2, the voltage-current conversion transistor T3 and the temperature balance adjustment transistor T4 all adopt the same type of NPN transistors.

4. The total field strength calculation circuit based on triode according to claim 1, characterized in that: The 2# voltage-dividing regulating resistor R6, 2# voltage-dividing regulating resistor R8 and 2# voltage-dividing regulating resistor R10 are all PTC thermistors.

5. The total field strength calculation circuit based on triode according to claim 4 is characterized in that: The temperature coefficient of the 2# voltage-dividing regulating resistor R6, 2# voltage-dividing regulating resistor R8 and 2# voltage-dividing regulating resistor R10 is 3300 PPM.

6. An omnidirectional strong electromagnetic pulse field sensor, characterized in that: include: A metal shielding shell, three axial sensing antennas, a signal processing module, a laser module, an optical fiber and a power supply; the signal processing module includes three axial voltage signal detection units and a total field strength calculation circuit based on a triode as described in any one of claims 1 to 5; The three axial sensing antennas are all arranged outside the metal shielding shell and are perpendicular to each other; the three axial voltage signal detection units, the total field strength calculation circuit, the laser module and the power supply are arranged inside the metal shielding shell; the three axial sensing antennas are respectively connected to the three detection signal input ends of the total field strength calculation circuit via the three axial voltage signal detection units; the output end of the signal conversion and regulation operational amplifier A2 of the total field strength calculation circuit is connected to the laser module and the optical fiber in turn; and the surface of the metal shielding shell is provided with three antenna vias for connecting the three axial sensing antennas and the three axial voltage signal detection units and one optical fiber via for connecting the laser module and the optical fiber; The metal shielding shell is used to shield and protect the signal processing module, the laser module and the power supply; The three axial sensing antennas are used to sense axial strong electromagnetic pulse field signal components and convert the sensed axial strong electromagnetic pulse field signal components into axial voltage signals; In the signal processing module, three axial voltage signal detection units are used to detect the axial voltage signals output by the three axial induction antennas to extract detection signals; the total field strength calculation circuit is used to complete the vector synthesis of the axial strong electromagnetic pulse field signal components to obtain the spatial field strength signal; The laser module is used to convert the spatial field intensity signal obtained by the signal processing module into an optical signal and transmit it externally through an optical fiber; The power supply is used to provide the signal processing module and the laser module with energy required for normal operation.

7. The omnidirectional strong electromagnetic pulse field sensor according to claim 6, characterized in that: The axial voltage signal detection units all adopt logarithmic detectors, which are used to extract the axial voltage signal of the axial induction antenna in a logarithmic detection manner.

8. The total field strength calculation circuit based on triode and the omnidirectional strong electromagnetic pulse field sensor according to claim 6, characterized in that: The axial induction antenna is a monopole electrically small antenna.

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