Static verification method for iterative harmonic working point, electronic equipment and storage medium

Abstract

The invention discloses an iterative harmonic working point static verification method, electronic equipment and a storage medium, and belongs to the technical field of static verification, the iterative harmonic working point static verification method comprises the following steps: placing an optical electric field sensor and verification equipment in a Faraday cage; an alternating current source is connected to a high-voltage transformer, a power frequency electric field with known intensity is generated through a pair of parallel electrode plates, and an optical electric field sensor is located between the pair of parallel electrode plates; emitting polarized light to an optical electric field sensor waveguide, and loading an electric field signal to be measured on a light wave; converting the electric field signal into an analog electric signal through a photoelectric conversion circuit; and the digital signal processing circuit demodulates and calculates the numerical value of the measured electric field. Static working point calibration is performed through a power frequency electric field environment, and a linear working point of the sensor is controlled by using a laser wavelength tuning and iteration method, so that the stability and accuracy of the optical electric field sensor in a high-voltage electric field environment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of static calibration, in particular to an iterative tuning working point static calibration method, electronic equipment and storage device. Background Art

[0002] At present, optical electric field sensors have broad application prospects in the fields of high-voltage line transmission, power equipment monitoring, and lightning disaster prevention. With the surge in my country's dual carbon goals and the demand for new energy grid connection, in order to achieve transparency of transmission lines, massive transmission line information needs to be monitored urgently. The power frequency electric field information sensing technology around high-voltage equipment can provide an important guarantee for judging the operating status of equipment. The massive influx of distributed energy and power electronic devices poses intelligent and distributed challenges to the new generation of sensing equipment. Traditional electrical electric field sensors are mainly separate active devices with narrow measurement bandwidth and can only be used for low-frequency electric field and DC electric field measurements. With the construction of new power systems, electric field measurement sensors are required to gradually transform into miniaturized, integrated, high-voltage, and wide-bandwidth optical electric field sensors. For the field of strong electric field, wide-bandwidth, and miniaturized electric field sensors, optical electric field sensors have gradually become the mainstream choice.

[0003] At present, the main technical means of optical electric field sensors are to integrate optical waveguide electro-optical modulators, dipole antennas, and modulation electrode plates on the surface of the crystal, load the electric field to be measured between the modulators, use the electro-optical effect characteristics of lithium niobate crystals to modulate the light waves propagating in the waveguide by the electric field, and determine the electric field intensity by measuring the output light intensity. However, optical electric field sensors can only achieve linear detection at static working points. When external physical quantities such as temperature, illuminance, and stress change, the working point will drift due to interference from the physical characteristics of the sensor, resulting in errors in the measurement results. For complex electromagnetic conditions of high-voltage transmission and distribution lines, the linear working point of the optical electric field sensor will drift uncertainly due to the influence of environmental electromagnetic fields, temperature, humidity, light, and other factors. Faced with outdoor high-voltage line environments, there is a lack of a field control and calibration scheme for the linear working point of optical electric field sensors suitable for transmission and distribution lines.

[0004] That is, optical electric field sensors are based on the electro-optical effect of lithium niobate (LiNbO3) crystals. When an external electric field acts on the optical electric field sensor, it affects the phase of the light wave, thereby changing the output light intensity. Current optical electric field sensors are widely used in high-voltage power transmission and distribution lines, lightning disaster prevention, and power equipment monitoring. However, in complex electromagnetic environments, external factors such as temperature, humidity, and light may cause the sensor's operating point to drift, affecting the measurement accuracy.

[0005] At present, the existing solutions for the drift problem of the sensor working point in the power frequency strong electric field environment are not ideal. In the face of high-voltage transmission and distribution line application scenarios, it is necessary to develop a real-time adjustable and widely applicable optical electric field sensor linear working point control solution. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the present invention provides an iterative tuning working point static calibration method, electronic device and storage device, which can perform static working point calibration through an industrial frequency electric field environment, and use laser wavelength tuning and iterative methods to control the linear working point of the sensor, thereby solving the instability problem of optical electric field sensors in a high-voltage electric field environment.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] In the first aspect, the present invention provides an iterative tuning working point static calibration method, which includes placing an optical electric field sensor and a calibration device in a Faraday cage; using an AC source to connect to a high-voltage transformer to generate an industrial frequency electric field of known intensity through a pair of parallel electrode plates, and the optical electric field sensor is located between the pair of parallel electrode plates; emitting polarized light to the optical electric field sensor waveguide, and loading the electric field signal to be measured on the light wave; converting the electric field signal into an analog electric signal through a photoelectric conversion circuit; and demodulating and calculating the measured electric field value through a digital signal processing circuit.

[0011] As a preferred solution of the iterative tuning working point static calibration method of the present invention, the Faraday cage is a metal sphere with uniform equipotential on the surface and an internal potential of 0. The Faraday cage is used to shield the external electromagnetic field and is not affected by the external environmental electric field during the calibration process.

[0012] As a preferred solution of the iterative tuning working point static calibration method of the present invention, the optical electric field sensor uses lithium niobate as the electro-optical effect material, the AC source is 220V / 50Hz, the output voltage of the high-voltage transformer is controlled, the size of a pair of parallel electrode plates is 40cm*60cm, and the spacing between the electrode plates is 20cm; when powered on, an industrial frequency electric field with a frequency of 50Hz and a known voltage strength is generated between the electrode plates as a calibration electric field; the direction of the dipole antenna on the surface of the optical electric field sensor is parallel to the direction of the electric field between the electrode plates. When the dipole antenna detects the electric field signal, an electric field is generated between the electrode plates, and the electric field signal is loaded onto the optical signal.

[0013] As a preferred solution of the iterative tuning working point static calibration method of the present invention, a tunable laser is used to emit polarized light to generate infrared polarized light with a wavelength between 1500-1600nm and a frequency range of 187.5-200GHz, and real-time wavelength adjustment is performed through MCU control; the infrared polarized light is modulated by the induced voltage during the waveguide transmission process, the phase difference changes, and the two polarized light beams at the waveguide output end converge and interfere, converting the phase difference into a light intensity difference signal.

[0014] As a preferred solution of the iterative tuning working point static calibration method of the present invention, the light intensity difference signal output by the optical electric field sensor is transmitted to a 1:9 coupler through a single-mode optical fiber, 90% of the light intensity difference signal is received by a photoelectric detector and converted into an electrical signal for processing, and 10% of the light intensity difference signal enters the MCU as a feedback signal.

[0015] As a preferred solution of the iterative tuning working point static calibration method of the present invention, the feedback signal is received by the MCU and subjected to analog-to-digital conversion and calculation processing to control the frequency and wavelength of the laser output light wave to achieve linear working point adjustment of the sensor.

[0016] As a preferred solution of the iterative tuning working point static verification method of the present invention, wherein: by selecting a group of frequencies and calculating the electrical signal difference between adjacent frequencies, the frequency interval with the maximum electrical signal difference is found, and the scan is continued to be refined until the working frequency is determined.

[0017] As a preferred solution of the iterative tuning working point static calibration method of the present invention, the linear working point wavelength of the optical electric field sensor is determined by iterative method through frequency scanning of the wavelength emitted by the tunable laser and according to the output signal change.

[0018] In a second aspect, the present invention provides an electronic device: comprising a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the above-mentioned iterative coordination working point static verification method.

[0019] In a third aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the above-mentioned iterative tuning working point static verification method.

[0020] The beneficial effects of the present invention are: solving the problem of operating point drift of optical electric field sensors caused by changes in external physical quantities such as temperature, light, and stress in complex electromagnetic environments, especially in high-voltage power transmission and distribution line environments. Through an iterative wavelength tuning method, the operating point of the optical electric field sensor can be adjusted in real time, thereby ensuring that the sensor can maintain high-precision linear detection performance. The core innovation of this solution is to perform static operating point calibration through an industrial frequency electric field environment, and use laser wavelength tuning and iterative methods to control the linear operating point of the sensor, thereby improving the stability and accuracy of the optical electric field sensor in a high-voltage electric field environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative labor. Among them:

[0022] Figure 1 Transfer function diagram of the optical electric field sensor for the iterative tuning operating point static calibration method.

[0023] Figure 2 Schematic diagram of the linear operation of the optical electric field sensor for the iterative tuning working point static calibration method. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] This is the first embodiment of the present invention, which provides an iterative tuning working point static verification method, comprising:

[0030] S100: placing the optical electric field sensor and the calibration device in a Faraday cage;

[0031] S200: Use an AC source to connect to a high-voltage transformer, generate a known strength of power frequency electric field through a pair of parallel electrode plates, and the optical electric field sensor is located between the pair of parallel electrode plates;

[0032] S300: emitting polarized light to the optical electric field sensor waveguide, and loading the electric field signal to be measured on the light wave;

[0033] S400: converting the electric field signal into an analog electric signal through a photoelectric conversion circuit;

[0034] S500: Demodulate and calculate the measured electric field value through the digital signal processing circuit.

[0035] Example 2

[0036] This embodiment is the second embodiment of the present invention.

[0037] S100: As in Example 1, placing the optical electric field sensor and the calibration device in a Faraday cage;

[0038] S200: Same as in Example 1, an AC source is connected to a high-voltage transformer, and a power frequency electric field of known strength is generated through a pair of parallel electrode plates, and the optical electric field sensor is located between the pair of parallel electrode plates;

[0039] S300: Similar to Example 1, emitting polarized light to the optical electric field sensor waveguide, and loading the electric field signal to be measured on the light wave;

[0040] S400: As in Example 1, converting the electric field signal into an analog electric signal through a photoelectric conversion circuit;

[0041] S500: As in Example 1, the measured electric field value is demodulated and calculated by a digital signal processing circuit;

[0042] S600: Add a signal amplification step in the photoelectric conversion circuit to improve the signal-to-noise ratio and ensure accurate measurement results even at low electric field strengths;

[0043] S700: Add a filtering step in the digital signal processing circuit to remove possible noise and interference and improve the accuracy of the electric field numerical calculation.

[0044] Example 3

[0045] See also Figure 1 and Figure 2 , which is the third embodiment of the present invention, and this embodiment is based on embodiment 1.

[0046] It is worth noting that the optical electric field sensor working system consists of an optical waveguide arm, an electrode plate, and an antenna. The principle of the optical electric field sensor is to use the electro-optical effect of lithium niobate LiNbO3 crystal. When the electric field changes, the refractive index of the lithium niobate crystal changes, and the electric field is inferred by measuring the change in the optical signal. Using x-cut y-transmitted lithium niobate crystal, two optical waveguide arms with inherent phase difference are prepared on the surface. The dipole antenna loads the electric field to be measured onto the electrode plate in the form of voltage, generating an electric field between the electrode plates. The electrode plate electric field is applied to one of the waveguide arms, so that the polarized light wave passing through this waveguide arm is modulated by the electric field, while the phase of the polarized light in the other waveguide arm remains unchanged, thereby changing the phase difference between the two polarized light beams. After the intersection and interference at the output end Y, the output light intensity signal carries the electric field frequency information. It is then converted into a current signal in the photodetector module through a single-mode optical fiber.

[0047] Specifically, a Faraday cage is a metal sphere with a uniform and equipotential surface and an internal potential of 0. The Faraday cage is used to shield external electromagnetic fields and is not affected by the electric field of the external environment during the calibration process. The Faraday cage can isolate the electromagnetic field outside the metal sphere and play a shielding role. In a complex external alternating electric field environment, free electrons can move back and forth on the surface of the metal conductor to offset the alternating electric field entering the interior, which is equivalent to a hollow sphere that can conduct electricity and has an internal potential of 0. The small-grid, low-resistance mesh-shaped Faraday cage frequency enclosure is grounded, and the surface is uniformly zero potential, which prevents electromagnetic waves from entering the high-voltage environment and creates a calibration environment without external electric field interference.

[0048] Preferably, the AC source is 220V / 50Hz, and the output voltage of the high-voltage transformer is controlled. The output voltage is connected to a pair of flat electrodes with copper wire. The size of a pair of parallel electrode plates is 40cm*60cm, and the spacing between the electrode plates is 20cm. When powered on, an industrial frequency electric field with a frequency of 50Hz and a known voltage strength is generated between the electrode plates as a calibration electric field.

[0049] The optical electric field sensor is placed in the central area between the electrode plates. The direction of the dipole antenna on the surface of the optical electric field sensor is parallel to the direction of the electric field between the electrode plates. When the dipole antenna detects the electric field signal, an electric field is generated between the electrode plates and the electric field signal is loaded onto the optical signal.

[0050] Preferably, a tunable laser is used to emit polarized light, which is connected to the waveguide input end of the optical electric field sensor through a polarization-maintaining optical fiber to generate infrared polarized light with a wavelength between 1500-1600nm and a frequency range of 187.5-200GHz, which enters the MZI waveguide on the surface of the optical electric field sensor, and the real-time wavelength adjustment is performed through MCU control; the infrared polarized light is modulated by the induced voltage during the waveguide transmission process, the phase difference changes, and the two polarized light beams at the waveguide output end converge and interfere, converting the phase difference into a light intensity difference signal.

[0051] Preferably, the light intensity difference signal output by the optical electric field sensor is transmitted to a 1:9 coupler via a single-mode optical fiber, 90% of the light intensity difference signal is received by a photodetector and converted into an electrical signal for processing, and the received signal waveform enters an oscilloscope via a coaxial cable for observation and comparison. 10% of the light intensity difference signal enters the MCU as a feedback signal. The feedback signal is input into the MCU for calculation, and then the wavelength of the output light of the tunable laser is controlled, thereby adjusting the sensor to a linear operating point.

[0052] Preferably, a horn antenna is placed near the electric field sensor to receive the calibration electric field, and the input waveform is input into an oscilloscope to be compared with the waveform of the electric field sensor.

[0053] Furthermore, the feedback signal is received by the MCU and subjected to analog-to-digital conversion and calculation processing, and the detected analog quantity is converted into a corresponding digital control signal, and the output wavelength of the adjustable laser is controlled through serial communication. When adjusting the working point, the MCU sends instructions to control the frequency and wavelength of the light wave output by the laser module. The laser frequency is controlled to sweep, and the waveform of the feedback voltage and frequency after the sweep is calculated. The wavelength of the working point is approximated and calculated using an iterative method. This realizes the linear working point adjustment of the optical electric field sensor.

[0054] Furthermore, by selecting a group of frequencies and calculating the electrical signal difference between adjacent frequencies, a frequency interval with a maximum electrical signal difference is found, and the scan is further refined until the operating frequency is determined.

[0055] Furthermore, the linear working point wavelength of the optical electric field sensor is determined by performing frequency scanning on the wavelength emitted by the tunable laser and changing the output signal through an iterative method.

[0056] It is worth noting that optical electric field sensors all have sinusoidal transfer functions, and the input-output characteristics of their measurement systems can be expressed as:

[0057]

[0058] Where Vout is the output voltage of the measurement system; A represents the optical path power and the photoelectric conversion coefficient; b represents the extinction ratio, which is typically 0.9 to 1; It is called the static operating point, that is, the phase difference between the two arms of the waveguide (MZ interference) or the two transmission modes of the light wave (common-path interference) when there is no electric field. It can be further expressed as It is called the optical bias point and is determined by the optical properties of the crystal (waveguide); It is an additional modulation mainly caused by temperature changes. It is the phase modulation caused by the external electric field and can be expressed as:

[0059]

[0060] Where Eπ is called the half-wave electric field, that is, the electric field intensity corresponding to when the phase modulation is equal to π. Eπ determines the dynamic range of the optical electric field sensor.

[0061] Let k = π / Eπ, then the formula can be rewritten as:

[0062]

[0063] like Figure 1 As shown, A, b, k and The four parameters determine the transfer function of the measurement system and can be obtained through calibration experiments. Ideally, At this time, the measurement system has linear input-output characteristics under the action of a small electric field; When it deviates seriously from π / 2, such as or The output waveform of the optical electric field sensor will be distorted, resulting in failure of the optical electric field sensor. Stable near π / 2, which requires an intrinsic optical bias point Close to π / 2, with additional phase difference As small as possible.

[0064] After obtaining the output Vout of the measurement system, the electric field to be measured can be inferred:

[0065]

[0066] The working method and principle of using the iterative method to sweep the working point wavelength are as follows. First, the wavelength range λ of the adjustable laser scanning is set to 1500nm to 1600nm, and the corresponding frequency range is f in the range of 187.5GHz to 200GHz. The polarized light passes through the optical electric field sensor waveguide with a length of L. After the electric field is modulated, its output light intensity has a cosine function relationship with the incident polarized light frequency f:

[0067]

[0068] in, is the phase difference generated after light passes through the waveguide, and its expression is:

[0069]

[0070] In the formula, c is the speed of light, λ is the working wavelength of the sensor, and n eff is the effective refractive index of the optical waveguide, and ΔL is the inherent arm length difference between the two waveguides. is the inherent phase difference of the optical waveguide. When the external environment changes, the inherent phase difference also changes. It is also called the unknown amount of the working point drift of the optical electric field sensor. Therefore, the phase difference caused by the modulation of the optical signal in the waveguide by the electric field is determined by two factors. The first is the electric field to be measured, and the second is the environmental influence factor. Definition of half-wave electric field E π is the electric field value of the sensor to be measured when the phase difference is π, and the output light intensity expression can be changed to:

[0071]

[0072] If and only if (m is an odd number), within the sensor range The sensor output light intensity can be approximately reduced to:

[0073]

[0074] At this time, the light intensity signal output by the optical electric field sensor has a linear function relationship with the measured electric field, and the sensor has the highest detection sensitivity under the linear working point state. However, in the high-voltage line environment, the unknown environmental variables generated by the outside world will cause inherent phase difference. The optical electric field sensor is out of the linear working point. The electric field is adjusted by controlling the frequency f to adjust the amount of change in the optical phase. The optical phase difference is thus kept at π / 2, controlling the sensor to be in the linear working region. The laser frequency that satisfies the optical electric field sensor to work in the linear working region is the working frequency f0. Under unknown conditions, the wavelength λ0 and frequency f0 of the working point are determined, and the frequency sweep approximation of the sensor is performed using an iterative method.

[0075] Select a set of m frequencies f with a frequency interval of Δf1 i (i=1,2,3...,m),(m=2π / Δf), output and record the corresponding frequency f i The sensor outputs an electrical signal E i , calculate the electrical signal difference ΔE between adjacent frequencies i-1 =(E i -E i-1 ), and obtain a group of m-1 sensor output electrical signal difference ΔE i-1 =(E i -E i-1 )(i=1,2,3...,m-1),(m=2π / Δf). MCU calculates and compares the maximum electrical signal difference ΔE k1 =ΔE i-1(max) , for ΔE k1 The frequency range (f k -f k-1 ) and then perform frequency sweep sampling.

[0076] Repeat the above steps to select the frequency interval (f k -f k-1 ) in which a frequency interval is Δf2=(f k -f k-1 ) / m of m frequencies f i (i=1,2,3...,m),(m=2π / Δf2), output and record the optical electric field sensor corresponding to the selected frequency f again i The output electrical signal E i , calculate the electrical signal difference ΔE between m-1 adjacent frequencies i-1 And compare to get the maximum electrical signal difference ΔE k2 =ΔE i-1(max) , for ΔE k2 The frequency range (f k '-f k-1 ') Select the frequency interval again as A set of m frequencies.

[0077] Repeat the above steps until Δf < 3 GHz, and record the frequency range (f k-1 ,f k ) and corresponding telecommunications (E i-1 ,E i ), taking the average value of the electrical signal Corresponding frequency f iThe target operating frequency f0 is the frequency that can provide a linear operating point, and the corresponding wavelength λ0 is the wavelength that can provide a linear operating point. The MCU controls the tunable laser (DBR) to output polarized light with a frequency of f0, and controls the optical electric field sensor to work within the static operating point.

[0078] See also Figure 2 , shows the waveform of the output signal and frequency f when the sensor is scanned by MCU. The operating point frequency f0 is determined by approximation method. At this time, the sensor works at Figure 2 At point a in (b), the output signal has the maximum rate of change relative to the frequency f, and the optical phase is This point corresponds to the target operating frequency f0 when the sensor works in the linear working area. The target operating frequency and operating wavelength can be expressed as:

[0079]

[0080] This embodiment also provides a computing device suitable for iteratively tuning the static calibration of the operating point, comprising: a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the iteratively tuning the static calibration method of the operating point proposed in the above embodiment.

[0081] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the iterative tuning working point static verification method proposed in the above embodiment is implemented.

[0082] The storage medium proposed in this embodiment and the iterative coordination working point static verification method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0083] Based on the above, the advantages of the present invention are: controlling the laser wavelength λ by the laser tuning method based on the iteration method, compensating for the inherent phase drift of the optical electric field sensor caused by the unknown environmental variation, and realizing the working point control of the optical electric field sensor.

[0084] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A static calibration method for iterative tuning working point, characterized in that: include: Placing the optical electric field sensor and the calibration equipment in a Faraday cage; An AC source is connected to a high-voltage transformer to generate a power frequency electric field of known strength through a pair of parallel electrode plates, and the optical electric field sensor is located between the pair of parallel electrode plates; Emits polarized light to the optical electric field sensor waveguide, and loads the electric field signal to be measured on the light wave; The electric field signal is converted into an analog electric signal through a photoelectric conversion circuit; The measured electric field value is demodulated and calculated through digital signal processing circuit.

2. The iterative tuning working point static calibration method according to claim 1, characterized in that: A Faraday cage is a metal sphere with a uniform equipotential on its surface and an internal potential of 0. The Faraday cage is used to shield external electromagnetic fields and to prevent the calibration process from being affected by the external electric field.

3. The iterative tuning working point static calibration method according to claim 1 or 2, characterized in that: The optical electric field sensor uses lithium niobate as the electro-optical effect material, the AC source is 220V / 50Hz, the output voltage of the high-voltage transformer is controlled, the size of a pair of parallel electrode plates is 40cm*60cm, and the distance between the electrode plates is 20cm; When powered on, a 50Hz power frequency electric field with known voltage strength is generated between the electrode plates as a calibration electric field. The direction of the dipole antenna on the surface of the optical electric field sensor is parallel to the direction of the electric field between the electrode plates. When the dipole antenna detects the electric field signal, an electric field is generated between the electrode plates and the electric field signal is loaded onto the optical signal.

4. The iterative tuning working point static calibration method according to claim 3, characterized in that: A tunable laser is used to emit polarized light, generating infrared polarized light with a wavelength between 1500-1600nm and a frequency range of 187.5-200GHz, and the wavelength is adjusted in real time through MCU control; The infrared polarized light is modulated by the induced voltage during the waveguide transmission process, the phase difference changes, and the two polarized lights converge and interfere at the output end of the waveguide, converting the phase difference into a light intensity difference signal.

5. The iterative tuning working point static calibration method according to claim 4, characterized in that: The light intensity difference signal output by the optical electric field sensor is transmitted to a 1:9 coupler through a single-mode optical fiber. 90% of the light intensity difference signal is received by the photodetector and converted into an electrical signal for processing, and 10% of the light intensity difference signal enters the MCU as a feedback signal.

6. The iterative tuning working point static calibration method according to claim 5, characterized in that: The feedback signal is received by the MCU and subjected to analog-to-digital conversion and calculation processing to control the frequency and wavelength of the laser output light wave to achieve linear operating point adjustment of the sensor.

7. The iterative tuning working point static calibration method according to claim 5, characterized in that: By selecting a set of frequencies and calculating the electrical signal difference between adjacent frequencies, the frequency interval with the maximum electrical signal difference is found, and the scan is continued to be refined until the operating frequency is determined.

8. The iterative tuning working point static calibration method according to claim 7, characterized in that: The linear working point wavelength of the optical electric field sensor is determined by an iterative method through frequency scanning of the wavelength emitted by the tunable laser and according to the change of the output signal.

9. An electronic device, characterized in that: include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the iterative tuning working point static verification method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: It stores computer executable instructions, which, when executed by a processor, can implement the steps of the iterative coordination working point static verification method described in any one of claims 1 to 8.

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