Wide-range optical fiber current sensor

Abstract

The invention discloses a wide-range optical fiber current sensor, which comprises a polarized light generation module, a double-ring differential phase sensing module and a photoelectric detector, and is characterized in that the polarized light generation module comprises a light source module, a coupler and a polarizer; the double-ring differential phase sensing module comprises a first polarization maintaining optical fiber, a 1 / 4 wave plate, a first optical fiber ring, a second optical fiber ring and a reflector. In the invention, the first optical fiber ring and the second optical fiber ring have the same winding direction, and the rotation direction of circularly polarized light is reversed through the 1 / 2 wave plate; or the winding directions of the first optical fiber ring and the second optical fiber ring are opposite, and the output end of the first optical fiber ring is directly connected with the input end of the second optical fiber ring, so that the acting directions of the magnetic fields on the polarized light in the two loops are opposite; therefore, the phase difference linear amplification can be realized through the difference of the Vierdet constants of the two optical fiber loops, the range limitation of the existing FOCS method is broken through, and the method can be suitable for the measurement of the megaampere-level ultra-large current.

Description

Technical Field

[0001] The present application relates to the technical field of plasma current measurement, and in particular to a large-range optical fiber current sensor. Background Art

[0002] In the field of nuclear fusion energy research, the tokamak is a key device. Its operating principle relies on strong magnetic fields to confine high-temperature plasma, thereby achieving controlled fusion reactions. In a tokamak, the magnetic system (including toroidal and poloidal field coils) and the precise measurement of plasma currents play a crucial role. These currents are extremely high, reaching megaamperes (MA) and even exceeding 20 MA.

[0003] Currently, existing current measurement technologies mainly include Rogowski coils and Hall sensors. However, these technologies have obvious limitations. They are extremely susceptible to interference in extreme electromagnetic environments, strong radiation, and low-temperature superconducting conditions, making it difficult to simultaneously meet the requirements of high precision, wide dynamic range, and long-term stability.

[0004] Fiber-optic current sensors (FOCS) are considered an ideal solution for current measurement in nuclear fusion devices due to their advantages such as electromagnetic interference resistance, high insulation performance, and wide bandwidth. However, traditional FOCS also have problems. Their range is usually less than 1mA. When it is necessary to measure extremely large currents (such as currents greater than 1mA), the sensor interferometer will experience fringe jumps due to the large optical path difference. This phenomenon can cause signal demodulation failure and, in severe cases, detection failure. This problem greatly limits the application of FOCS in tokamak megaampere current measurement.

[0005] In view of the above situation, breaking through the range limitation of the existing FOCS and developing a high-precision, anti-interference measurement technology suitable for ultra-large currents of 20MA is of great significance for achieving precise control of the tokamak magnetic confinement configuration, plasma stability monitoring and safe operation of the device. Summary of the Invention

[0006] In order to solve the technical problems in the prior art, the present application provides a large-range fiber optic current sensor.

[0007] The present application provides a large-range optical fiber current sensor that adopts the following technical solution: A large-range optical fiber current sensor comprising: A polarized light generating module includes a light source module, a coupler, and a polarizer, wherein the light source module is configured to emit broadband light, the input end of the coupler is connected to the output end of the light source module, and the output end of the coupler is connected to the input end of the polarizer; a dual-ring differential phase sensing module includes a first polarization-maintaining fiber, a quarter-wave plate, a first fiber ring, a second fiber ring, and a reflector, wherein one end of the first polarization-maintaining fiber is connected to the output end of the polarizer, the other end of the first polarization-maintaining fiber is connected to one end of the quarter-wave plate, the other end of the quarter-wave plate is connected to the input end of the first fiber ring, and the output end of the second fiber ring is connected to the reflector; the Verdet constants of the first fiber ring and the second fiber ring are unequal, and the first fiber ring and the second fiber ring are both configured to be wound around a current-carrying conductor to be measured; when the first fiber ring and the second fiber ring are wound in the same direction, the output end of the first fiber ring is connected to the input end of the first fiber ring via a half-wave plate; when the first fiber ring and the second fiber ring are wound in opposite directions, the output end of the first fiber ring is directly connected to the input end of the second fiber ring; and A photodetector, wherein an input end of the photodetector is connected to a return end of the coupler.

[0008] By adopting the above technical solution, the first fiber ring and the second fiber ring are arranged in the same direction, and the rotation direction of the circularly polarized light is reversed by the 1 / 2 wave plate. Or the first fiber optic ring and the second fiber optic ring are wound in opposite directions, and the output end of the first fiber optic ring is directly connected to the input end of the second fiber optic ring, so that the magnetic fields in the two loops act in opposite directions on the polarized light. Moreover, since the first fiber optic ring and the second fiber optic ring are made of materials with different Verdet constants, the difference in the Verdet constants of the two fiber optic rings can be used to achieve linear amplification of the phase difference, thereby breaking through the range limitation of the existing FOCS method and being applicable to the measurement of ultra-large currents of 20MA.

[0009] Preferably, the quarter wave plate is a second polarization-maintaining optical fiber, and the length of the second polarization-maintaining optical fiber is 1 / 4 of the optical fiber beat length.

[0010] Preferably, the 1 / 2 wave plate is a third polarization-maintaining optical fiber, and the length of the third polarization-maintaining optical fiber is 1 / 2 of the optical fiber beat length.

[0011] Preferably, the first optical fiber ring and the second optical fiber ring are both spun-type circular optical fibers.

[0012] Preferably, the difference ΔV between the Verdet constants of the first optical fiber ring and the second optical fiber ring satisfies: ΔV=V1-V2≥1%·V2 Wherein, V1 is the Verdet constant of the first optical fiber ring, and V2 is the Verdet constant of the second optical fiber ring.

[0013] Preferably, the number of turns of the first optical fiber ring and the second optical fiber ring is the same and both are N, and N≥1. By adjusting the value of N, the maximum measurable current range of the sensor can be controlled.

[0014] Preferably, the Faraday phase difference φs output by the dual-loop differential phase sensing module satisfies the relationship: Φs=4N·(V1-V2)·I Wherein, I is the current value flowing through the current-carrying wire to be measured, N is the number of turns of the first fiber optic loop and the second fiber optic loop, V1 is the Verdet constant of the first fiber optic loop, and V2 is the Verdet constant of the second fiber optic loop.

[0015] Preferably, when the winding directions of the first optical fiber ring and the second optical fiber ring are opposite, the output end of the first optical fiber ring and the input end of the second optical fiber ring are axially fused.

[0016] Preferably, the large-range optical fiber current sensor also includes a post-processing module, which includes a preamplifier, a first converter, a signal processing unit, a second converter and a phase modulator. The input end of the preamplifier is electrically connected to the output end of the photodetector and is used to pre-amplify the electrical signal output by the photodetector. The input end of the first converter is electrically connected to the output end of the preamplifier and is used to convert the analog signal input by the preamplifier into a digital signal. The input end of the signal processing unit is electrically connected to the output end of the first converter and is used to process the digital signal. The input end of the second converter is electrically connected to the output end of the signal processing unit and is used to convert the digital signal input by the signal processing unit into an analog signal. The phase modulator is electrically connected to the output end of the second converter and is used to modulate the phase of the optical signal in the first polarization-maintaining optical fiber according to the acquired signal.

[0017] Preferably, the polarized light generating module further includes a light source driving circuit, which is electrically connected to the light source module and is used to provide driving for the light source module.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. The first fiber ring and the second fiber ring are wound in the same direction, and the rotation direction of the circularly polarized light is reversed by a 1 / 2 wave plate. Alternatively, the first fiber optic ring and the second fiber optic ring are wound in opposite directions, and the output end of the first fiber optic ring is directly connected to the input end of the second fiber optic ring, so that the magnetic fields in the two loops act in opposite directions on the polarized light. Furthermore, since the first fiber optic ring and the second fiber optic ring are made of materials with different Verdet constants, the difference in the Verdet constants of the two fiber optic rings can be used to achieve linear amplification of the phase difference, thereby breaking through the range limitation of the existing FOCS method and being applicable to the measurement of ultra-large currents in the megaampere level.

[0019] 2. Adjusting the number of turns, N, of the first and second fiber loops directly controls the sensor's maximum measurable current range. By selecting N and combining V1 / V2, the sensor can be flexibly adapted to the measurement requirements of different tokamak magnet systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the large-range fiber optic current sensor provided in Example 1 of the present application; Figure 2 yes Figure 1 Schematic diagram of the structure of the dual-loop differential phase sensing module; Figure 3 Schematic diagram of the structure of the large-range fiber optic current sensor provided in Example 2 of the present application; Figure 4 yes Figure 3 Schematic diagram of the structure of the dual-loop differential phase sensing module; Explanation of the accompanying symbols: 1. Polarized light generating module; 11. Light source module; 12. Coupler; 13. Polarizer; 14. Light source driving circuit; 2. Dual-ring differential phase sensing module; 21. First polarization-maintaining fiber; 211. 45° polarization-maintaining fiber melting point; 22. 1 / 4 wave plate; 23. First fiber ring; 24. Second fiber ring; 25. Reflector; 26. 1 / 2 wave plate; 3. Photodetector; 4. Current-carrying wire; 5. Post-processing module; 51. Preamplifier; 52. First converter; 53. Signal processing unit; 54. Second converter; 55. Phase modulator. DETAILED DESCRIPTION

[0021] The following is combined with Figures 1-4 This application is described in further detail.

[0022] See also Figure 1 and Figure 2 , Example 1 of the present application discloses a large-range optical fiber current sensor. Figure 1 and Figure 2 The large-range optical fiber current sensor includes a polarization light generating module 1, a dual-loop differential phase sensing module 2 and a photodetector 3.

[0023] The polarized light generating module 1 includes a light source module 11 , a coupler 12 and a polarizer 13 . The light source module 11 is used to emit broadband light. The input end of the coupler 12 is connected to the output end of the light source module 11 , and the output end of the coupler 12 is connected to the input end of the polarizer 13 .

[0024] The dual-ring differential phase sensing module 2 includes a first polarization-maintaining fiber 21, a quarter-wave plate 22, a first fiber ring 23, a second fiber ring 24, and a reflector 25. One end of the first polarization-maintaining fiber 21 is connected to the output end of the polarizer 13. In this embodiment, one end of the first polarization-maintaining fiber 21 is fused to the output end of the polarizer 13 via a 45° polarization-maintaining fiber melting point 211. The other end of the first polarization-maintaining fiber 21 is connected to one end of the quarter-wave plate 22. The other end of the quarter-wave plate 22 is connected to the input end of the first fiber ring 23. The output end of the second fiber ring 24 is connected to the reflector 25. The Verdet constants of the first fiber ring 23 and the second fiber ring 24 are not equal. The first fiber ring 23 and the second fiber ring 24 are both used to be wound around the current-carrying wire 4 to be measured. In Example 1, the first fiber ring 23 and the second fiber ring 24 have the same winding direction. The output end of the first fiber ring 23 is connected to the input end of the first fiber ring 23 via a half-wave plate 26.

[0025] The input end of the photodetector 3 is connected to the return end of the coupler 12 .

[0026] During use, the light source module 11 emits broadband light, which enters the polarizer 13 through the coupler 12 and is converted into linearly polarized light in a single direction. The linearly polarized light passes through the 45° polarization-maintaining fiber melting point 211 and is evenly distributed along the two orthogonal axes (fast and slow axes) of the first polarization-maintaining fiber 21 for transmission. When the light passes through the quarter-wave plate 22, the fast-axis and slow-axis light are converted into left-handed circularly polarized light (LCP) and right-handed circularly polarized light (RCP), respectively. The LCP and RCP light enter the first fiber loop 23 (Verdet constant V1). The magnetic field generated by the current I in the current-carrying conductor 4 to be measured causes a phase difference of φ1 = 4N·V1·I between the two beams (N is the number of fiber turns). After the light passes through the half-wave plate 26, the rotational directions of the LCP and RCP light reverse (LCP → RCP, RCP → LCP). The counter-rotating light enters the second fiber loop 24 (Verdet constant V2). The magnetic field acts in the opposite direction to that of the first loop, resulting in a phase difference of φ2 = -4N·V2·I. The light returns along its original path through reflector 25, then passes through the second fiber loop, half-wave plate, first fiber loop, and quarter-wave plate, returning to first polarization-maintaining fiber 21 to form an interference signal. After passing through quarter-wave plate 22, the circularly polarized light returns to linear polarization, but the polarization directions of the fast and slow axes are swapped. The returning linearly polarized light forms an interference signal in first polarization-maintaining fiber 21, which then passes through coupler 12 and enters photodetector 3. Photodetector 3 detects the phase difference of the interference signal and, based on this phase difference, determines the current in current-carrying conductor 4 to be measured.

[0027] The technical effect of the above technical solution is that the first fiber ring 23 and the second fiber ring 24 are wound in the same direction, but the rotation direction of the circularly polarized light is reversed by the 1 / 2 wave plate 26. The directions of action of the magnetic fields on the polarized light in the two loops are opposite, and since the first fiber optic ring 23 and the second fiber optic ring 24 are made of materials with different Verdet constants, the phase difference can be linearly amplified by the difference in the Verdet constants of the two fiber optic rings, thereby breaking through the range limitation of the existing FOCS method and being applicable to the measurement of ultra-large currents of 20MA.

[0028] In one embodiment, see Figure 1 and Figure 2 The quarter wave plate 22 is a second polarization-maintaining optical fiber, and the length of the second polarization-maintaining optical fiber is 1 / 4 of the optical fiber beat length.

[0029] In one embodiment, see Figure 1 and Figure 2 The 1 / 2 wave plate is a third polarization-maintaining optical fiber, and the length of the third polarization-maintaining optical fiber is 1 / 2 of the optical fiber beat length.

[0030] In one embodiment, see Figure 1 and Figure 2 The first optical fiber ring 23 and the second optical fiber ring 24 are both spun-type circular optical fibers.

[0031] In one embodiment, see Figure 1 and Figure 2 , the difference ΔV of the Verdet constants between the first optical fiber ring 23 and the second optical fiber ring 24 satisfies: ΔV=V1-V2≥1%·V2 Wherein, V1 is the Verdet constant of the first optical fiber ring 23 , and V2 is the Verdet constant of the second optical fiber ring 24 .

[0032] In one embodiment, see Figure 1 and Figure 2 The first fiber optic ring 23 and the second fiber optic ring 24 have the same number of turns, N, and N ≥ 1. By adjusting the value of N, the maximum measurable current range of the sensor can be controlled. In this embodiment, the maximum measurable current range of the sensor is directly controlled by adjusting the number of turns N of the first fiber optic ring 23 and the second fiber optic ring 24. By selecting the combination of N and V1 / V2, the measurement requirements of different tokamak magnet systems (such as MA current of the toroidal field coil and 20MA current of the plasma) can be flexibly adapted.

[0033] In one embodiment, see Figure 1 and Figure 2 , the Faraday phase difference φs output by the dual-loop differential phase sensing module 2 satisfies the relationship: Φs=4N·(V1-V2)·I Wherein, I is the current value flowing through the current-carrying wire 4 to be measured, N is the number of turns of the first optical fiber ring 23 and the second optical fiber ring 24, V1 is the Verdet constant of the first optical fiber ring 23, and V2 is the Verdet constant of the second optical fiber ring 24.

[0034] In one embodiment, it is assumed that the difference in the Verdet constant of the optical fibers used in the first optical fiber ring and the second optical fiber ring is 1.5%, that is: ΔV=V1-V2=0.015V2 but Therefore, compared with a sensor with only a single fiber optic ring, the measuring range is expanded to 1 / 0.015≈66.7 times.

[0035] Assuming there is only a single fiber ring with at least 1 turn, when the current is 700 kA, the interference light generates a π phase difference. In the present invention, the measured current when the interference light generates a π phase difference reaches 46.7 mA.

[0036] By changing the number of turns N of the first and second fiber loops, the maximum measured current can be adjusted. For example, if N = 2, the measured current when the interference light produces a π phase difference reaches 23.3mA, and it is possible to measure ultra-large currents up to 20mA without jumping into second-order interference fringes.

[0037] In one embodiment, see Figure 1 and Figure 2 When the winding directions of the first optical fiber ring 23 and the second optical fiber ring 24 are opposite, the output end of the first optical fiber ring 23 and the input end of the second optical fiber ring 24 are axially fused.

[0038] In one embodiment, see Figure 1 and Figure 2 The large-range optical fiber current sensor also includes a post-processing module 5, which includes a preamplifier 51, a first converter 52, a signal processing unit 53, a second converter 54 and a phase modulator 55. The input end of the preamplifier 51 is electrically connected to the output end of the photodetector 3, and is used to pre-amplify the electrical signal output by the photodetector 3. The input end of the first converter 52 is electrically connected to the output end of the preamplifier 51, and is used to convert the analog signal input by the preamplifier 51 into a digital signal. The input end of the signal processing unit 53 is electrically connected to the output end of the first converter 52, and is used to process the digital signal. The input end of the second converter 54 is electrically connected to the output end of the signal processing unit 53, and is used to convert the digital signal input by the signal processing unit 53 into an analog signal. The phase modulator 55 is electrically connected to the output end of the second converter 54, and is used to modulate the phase of the optical signal in the first polarization-maintaining optical fiber 21 according to the acquired signal.

[0039] In this embodiment, the electrical signal (carrying Faraday phase difference information) output by the photodetector 3 is first input to the preamplifier 51 for low-noise preamplification to increase the signal amplitude and avoid degradation of the signal-to-noise ratio in subsequent processing steps. The amplified analog signal is converted into a digital signal by the first converter 52 (ADC), eliminating electromagnetic interference in analog transmission and providing a high-precision data basis for digital algorithm processing. The signal processing unit 53 processes the digital signal: the processed digital signal is converted into an analog signal and output to the phase modulator 55. The phase modulator 55 dynamically modulates the phase of the optical signal in the first polarization-maintaining optical fiber 21 based on the feedback signal, forming a closed-loop control to compensate for phase drift caused by environmental disturbances (such as temperature and vibration) in real time.

[0040] In one embodiment, see Figure 1 and Figure 2The polarized light generating module 1 further includes a light source driving circuit 14 , which is electrically connected to the light source module 11 and is used to provide driving for the light source module 11 .

[0041] Example 2 See also Figure 3 and Figure 4 Embodiment 2 of the present application discloses a large-range optical fiber current sensor. The difference between Embodiment 2 and Embodiment 1 is that: In Example 2, the winding directions of the first optical fiber ring 23 and the second optical fiber ring 24 are opposite, and the output end of the first optical fiber ring 23 is directly connected to the input end of the second optical fiber ring 24 .

[0042] In this embodiment, the first fiber ring 23 and the second fiber ring 24 are wound in opposite directions so that the directions of the magnetic fields in the two loops are naturally opposite, and the opposite signs of the phase difference can be achieved without a half-wave plate, which can reduce the number of components in the optical path.

[0043] The technical effects of the technical solution provided by this application include: (1) The first fiber ring 23 and the second fiber ring 24 are wound in the same direction, and the rotation direction of the circularly polarized light is reversed by the 1 / 2 wave plate 26. Alternatively, the first fiber optic ring 23 and the second fiber optic ring 24 are wound in opposite directions, and the output end of the first fiber optic ring 23 is directly connected to the input end of the second fiber optic ring 24, so that the directions of action of the magnetic fields on polarized light in the two loops are opposite. Moreover, since the first fiber optic ring 23 and the second fiber optic ring 24 are made of materials with different Verdet constants, the difference in the Verdet constants of the two fiber optic rings can be used to achieve linear amplification of the phase difference, thereby breaking through the range limitation of the existing FOCS method and being applicable to the measurement of ultra-large currents in the megaampere level.

[0044] (2) The maximum measurable current range of the sensor is directly controlled by adjusting the number of turns N of the first fiber optic ring 23 and the second fiber optic ring 24. By selecting the combination of N and V1 / V2, the measurement requirements of different tokamak magnet systems can be flexibly adapted.

[0045] The specific implementation methods of the present application described above do not constitute a limitation on the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the present application.

Claims

1. A large-range fiber optic current sensor, characterized by: include: A polarized light generating module (1) comprises a light source module (11), a coupler (12) and a polarizer (13); the light source module (11) is used to emit broadband light; the input end of the coupler (12) is connected to the output end of the light source module (11); and the output end of the coupler (12) is connected to the input end of the polarizer (13); A dual-ring differential phase sensing module (2) comprises a first polarization-maintaining optical fiber (21), a quarter-wave plate (22), a first optical fiber ring (23), a second optical fiber ring (24) and a reflector (25), wherein one end of the first polarization-maintaining optical fiber (21) is connected to the output end of the polarizer (13), the other end of the first polarization-maintaining optical fiber (21) is connected to one end of the quarter-wave plate (22), the other end of the quarter-wave plate (22) is connected to the input end of the first optical fiber ring (23), the output end of the second optical fiber ring (24) is connected to the reflector (25), and the first optical fiber ring (23) and the second optical fiber ring (24) are connected to each other. The Verdet constants of the optical fiber rings (24) are not equal, the first optical fiber ring (23) and the second optical fiber ring (24) are both used for winding around the current-carrying conductor (4) to be measured, when the winding directions of the first optical fiber ring (23) and the second optical fiber ring (24) are the same, the output end of the first optical fiber ring (23) and the input end of the first optical fiber ring (23) are connected via a 1 / 2 wave plate (26), when the winding directions of the first optical fiber ring (23) and the second optical fiber ring (24) are opposite, the output end of the first optical fiber ring (23) and the input end of the second optical fiber ring (24) are directly connected; and, A photodetector (3), wherein the input end of the photodetector (3) is connected to the return end of the coupler (12).

2. The large-range fiber optic current sensor according to claim 1, characterized in that: The quarter wave plate (22) is a second polarization-maintaining optical fiber, and the length of the second polarization-maintaining optical fiber is 1 / 4 of the optical fiber beat length.

3. The large-range fiber optic current sensor according to claim 1, characterized in that: The 1 / 2 wave plate (26) is a third polarization-maintaining optical fiber, and the length of the third polarization-maintaining optical fiber is 1 / 2 of the optical fiber beat length.

4. The large-range fiber optic current sensor according to claim 1, characterized in that: The first optical fiber ring (23) and the second optical fiber ring (24) are both spun-type circular optical fibers.

5. The large-range fiber optic current sensor according to claim 1, characterized in that: The difference ΔV of the Verdet constants between the first optical fiber ring (23) and the second optical fiber ring (24) satisfies: ΔV = V1−V2 ≥1%·V2 Wherein, V1 is the Verdet constant of the first optical fiber ring (23), and V2 is the Verdet constant of the second optical fiber ring (24).

6. The large-range fiber optic current sensor according to claim 1, characterized in that: The number of turns of the first optical fiber ring (23) and the second optical fiber ring (24) is the same and both are N, and N≥1. The maximum measurable current range of the sensor can be controlled by adjusting the value of N.

7. The large-range fiber optic current sensor according to claim 1, characterized in that: The Faraday phase difference φs output by the dual-loop differential phase sensing module (2) satisfies the relationship: Φs = 4N⋅(V1−V2) ·I Wherein, I is the current value passed through the current-carrying wire (4) to be measured, N is the number of turns of the first optical fiber ring (23) and the second optical fiber ring (24), V1 is the Verdet constant of the first optical fiber ring (23), and V2 is the Verdet constant of the second optical fiber ring (24).

8. The large-range fiber optic current sensor according to claim 1, characterized in that: When the winding directions of the first optical fiber ring (23) and the second optical fiber ring (24) are opposite, the output end of the first optical fiber ring (23) and the input end of the second optical fiber ring (24) are axially fused.

9. The large-range fiber optic current sensor according to claim 1, characterized in that: The optical fiber (21) further comprises a post-processing module (5), the post-processing module (5) comprising a preamplifier (51), a first converter (52), a signal processing unit (53), a second converter (54) and a phase modulator (55), wherein the input end of the preamplifier (51) is electrically connected to the output end of the photodetector (3) and is used to preamplify the electrical signal output by the photodetector (3), the input end of the first converter (52) is electrically connected to the output end of the preamplifier (51) and is used to convert the analog signal input by the preamplifier (51) into a digital signal, the input end of the signal processing unit (53) is electrically connected to the output end of the first converter (52) and is used to process the digital signal, the input end of the second converter (54) is electrically connected to the output end of the signal processing unit (53) and is used to convert the digital signal input by the signal processing unit (53) into an analog signal, and the phase modulator (55) is electrically connected to the output end of the second converter (54) and is used to modulate the phase of the optical signal in the first polarization-maintaining optical fiber (21) according to the acquired signal.

10. The large-range fiber optic current sensor according to claim 1, characterized in that: The polarized light generating module (1) further comprises a light source driving circuit (14), which is electrically connected to the light source module (11) and is used to provide driving for the light source module (11).

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