Optical fiber current sensor calibrator

Abstract

The utility model discloses an optical fiber current sensor calibrator, which comprises an optical fiber current sensor main body, a sensing detection head and a calibration device, a sensor box door is arranged on the front surface of the optical fiber current sensor main body, and the calibration device is connected to the sensor box door. The sensing detection head is arranged on one side of the optical fiber current sensor body, one end, close to the optical fiber current sensor body, of the sensing detection head is connected with a polarizer, and one side, away from the sensing detection head, of the polarizer is connected with a first light receiving optical fiber, a second light receiving optical fiber and a light sending optical fiber. A calibration signal output line and an uncalibrated signal output line are arranged on the side, away from the sensing detection head, of the optical fiber current sensor body, the uncalibrated signal output line is arranged below the calibration signal output line, the current of the optical fiber current sensor can be detected, the current measurement result is compared and corrected, and the accuracy of the optical fiber current sensor is improved. And the real-time measurement result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber current sensors, in particular to an optical fiber current sensor calibrator. Background Art

[0002] Fiber optic current sensor is a new type of current sensor based on Faraday magneto-optical effect and using optical fiber as medium.

[0003] When linearly polarized light propagates in a medium, if a strong magnetic field is applied parallel to the propagation direction of the light, the vibration direction of the light will be deflected. The deflection angle ψ is proportional to the product of the magnetic induction intensity B and the length l that the light travels through the medium, that is, ψ=V*B*l. The proportional coefficient V is called the Verdet constant, which is related to the properties of the medium and the frequency of the light wave. The deflection direction depends on the properties of the medium and the direction of the magnetic field.

[0004] Since the accuracy of the instrument's zero wavelength cannot be guaranteed during daily monitoring, the usual measurement data also has deviations, and it cannot be used in situations where real-time monitoring is required or where higher sensitivity is required.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a fiber optic current sensor calibrator is proposed, in order to achieve a more practical purpose. Utility Model Content

[0006] The purpose of the utility model is to provide a fiber optic current sensor calibrator to solve the problem mentioned in the above background that the accuracy of the zero wavelength of the instrument cannot be guaranteed during daily monitoring, so the usual measurement data also has deviations and cannot be applied to occasions with high real-time monitoring or high sensitivity requirements.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fiber optic current sensor calibrator, comprising a fiber optic current sensor body, a sensor detection head and a calibration device, a sensor box door is arranged on the front of the fiber optic current sensor body, and the calibration device is connected to the sensor box door, a calibration display is arranged on the calibration device, the sensor detection head is arranged on one side of the fiber optic current sensor body, and a polarizer is connected to the end of the sensor detection head close to the fiber optic current sensor body, and a No. 1 light receiving optical fiber, a No. 2 light receiving optical fiber and a light sending optical fiber are connected to the side of the polarizer away from the sensor detection head, a calibration signal output line and an uncalibrated signal output line are arranged on the side of the fiber optic current sensor body away from the sensor detection head, and the uncalibrated signal output line is arranged below the calibration signal output line.

[0008] Preferably, filters are provided at the connection points between the No. 1 light receiving optical fiber, the No. 2 light receiving optical fiber and the polarizer, and an electronic circuit portion is connected to the No. 1 light receiving optical fiber, the No. 2 light receiving optical fiber and the end of the light transmitting optical fiber away from the polarizer.

[0009] Preferably, a light receiving element is provided at the connection between the No. 1 light receiving optical fiber and the No. 2 light receiving optical fiber and the electronic circuit part, and a signal processing circuit is connected to the side of the two groups of light receiving elements away from the No. 1 light receiving optical fiber and the No. 2 light receiving optical fiber, and a light source is provided at the connection between the light sending optical fiber and the electronic circuit part.

[0010] Preferably, a calibrator circuit part is provided in the calibration device, and the calibration device is connected to the electronic circuit part and an information transmission line, and the information transmission line and the uncalibrated signal output line are both connected to the signal processing circuit.

[0011] Preferably, a power amplifier, a proportional signal regulating transmitter and a modulator are provided inside the loop part of the calibrator, and the power amplifier is connected to the information transmission line, a proportional coil is connected between the proportional signal regulating transmitter and the power amplifier, a difference comparator is connected between the proportional signal regulating transmitter and the modulator, and the modulator is also connected to the calibration signal output line.

[0012] Compared with the prior art, the utility model has the beneficial effects of being able to detect the current size of the optical fiber current sensor, and by comparing and correcting the current measurement results, making the real-time measurement results more accurate, the specific contents of which are as follows:

[0013] The signal processing circuit in the electronic circuit part processes the current information in the detection conductor. The light source emits a laser beam from the light transmitting optical fiber, and the laser beam enters the first light receiving optical fiber and the second light receiving optical fiber through the light receiving element, and generates polarized light through the polarizer. The filter effectively filters the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, and the signal processing circuit processes the current signal. The current signal processed by the electronic circuit part is transmitted to the calibrator circuit part and the equipment terminal by the information transmission line and the uncalibrated signal output line respectively. After the current information enters the calibrator circuit part, the power amplifier amplifies the current signal, and the proportional coil converts the electrical signal into a proportional mechanical displacement signal, and then the proportional signal adjustment transmitter processes the mechanical displacement signal and converts it into a digital signal, and then the difference comparator compares the digital signal, and modulates the digital signal through the modulator according to the difference, and the processed information is transmitted to the terminal by the calibration signal output line. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic structural diagram of the main body of a fiber optic current sensor calibrator of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of a main body of a fiber optic current sensor calibrator of the utility model;

[0016] Figure 3 This is a structural schematic diagram of the electronic circuit portion of a fiber optic current sensor calibrator of the utility model;

[0017] Figure 4 The utility model is a schematic diagram of the structure of a calibrator circuit part of a fiber optic current sensor calibrator.

[0018] In the figure: 1. Fiber optic current sensor body; 11. Sensor box door; 2. Sensor detection head; 21. Polarizer; 22. Filter; 23. No. 1 light receiving fiber; 24. No. 2 light receiving fiber; 25. Light transmitting fiber; 26. Electronic circuit part; 261. Light receiving element; 262. Light source; 263. Signal processing circuit; 3. Calibration device; 31. Calibration display; 32. Calibrator circuit part; 321. Power amplifier; 322. Proportional coil; 323. Proportional signal adjustment transmitter; 324. Difference comparator; 325. Modulator; 4. Calibration signal output line; 5. Uncalibrated signal output line; 6. Information transmission line. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1 to 4 The utility model provides a technical solution: a fiber optic current sensor calibrator, comprising a fiber optic current sensor body 1, a sensor detection head 2 and a calibration device 3, a sensor box door 11 is arranged on the front of the fiber optic current sensor body 1, and the calibration device 3 is connected to the sensor box door 11, and a calibration display 31 is arranged on the calibration device 3, the sensor detection head 2 is arranged on one side of the fiber optic current sensor body 1, and the end of the sensor detection head 2 close to the fiber optic current sensor body 1 is connected to a polarizer 21, and the side of the polarizer 21 away from the sensor detection head 2 is connected to a first light receiving optical fiber 23, a second light receiving optical fiber 24 and a light sending optical fiber 25, and a calibration signal output line 4 and an uncalibrated signal output line 5 are arranged on the side of the fiber optic current sensor body 1 away from the sensor detection head 2, and the uncalibrated signal output line 5 is arranged below the calibration signal output line 4.

[0021] The conductor to be detected passes through the sensing detection head 2, and the current value detection and comparative calibration are completed in the optical fiber current sensor body 1, and the calibrated data is displayed on the calibration display 31 in the calibration device 3, and the uncalibrated information detected by the optical fiber current sensor body 1 and the calibrated information are transmitted to the terminal for recording by the uncalibrated signal output line 5 and the calibration signal output line 4 respectively, and the optical fiber current sensor body 1 can be opened through the sensor box door 11, so as to facilitate the maintenance of various components inside it.

[0022] A filter 22 is provided at the connection between the No. 1 light receiving optical fiber 23 and the No. 2 light receiving optical fiber 24 and the polarizer 21, and an electronic circuit part 26 is connected to the ends of the No. 1 light receiving optical fiber 23 and the No. 2 light receiving optical fiber 24 and the light transmitting optical fiber 25 away from the polarizer 21, and a light receiving element 261 is provided at the connection between the No. 1 light receiving optical fiber 23 and the No. 2 light receiving optical fiber 24 and the electronic circuit part 26, and a signal processing circuit 263 is connected to the side of the two groups of light receiving elements 261 away from the No. 1 light receiving optical fiber 23 and the No. 2 light receiving optical fiber 24, and the light transmitting optical fiber 25 and the electronic circuit part 26. A light source 262 is provided at the connection point, and the signal processing circuit 263 in the electronic circuit part 26 processes the current information in the detection conductor. The light source 262 emits a laser beam from the light transmitting optical fiber 25, and the laser beam enters the No. 1 light receiving optical fiber 23 and the No. 2 light receiving optical fiber 24 through the light receiving element 261, and generates polarized light through the polarizer 21. The filter 22 effectively filters out the frequency point of a specific frequency in the power line or the frequency other than the frequency point to obtain a power signal of a specific frequency, and the signal processing circuit 263 processes the current signal.

[0023] The calibration device 3 is provided with a calibration instrument loop section 32, and the calibration device 3 is connected to the electronic loop section 26 and the information transmission line 6, and the information transmission line 6 and the uncalibrated signal output line 5 are both connected to the signal processing loop 263. The calibration instrument loop section 32 is provided with a power amplifier 321, a proportional signal adjustment transmitter 323, and a modulator 325, and the power amplifier 321 is connected to the information transmission line 6, a proportional coil 322 is connected between the proportional signal adjustment transmitter 323 and the power amplifier 321, a difference comparator 324 is connected between the proportional signal adjustment transmitter 323 and the modulator 325, and the modulator 325 is also connected to the calibration signal output line 4. The current signal processed by the electronic circuit part 26 is transmitted to the calibrator circuit part 32 and the equipment terminal by the information transmission line 6 and the uncalibrated signal output line 5 respectively. After the current information enters the calibrator circuit part 32, the power amplifier 321 amplifies the current signal, and the proportional coil 322 converts the electrical signal into a mechanical displacement signal proportional to it, and then the proportional signal adjustment transmitter 323 processes the mechanical displacement signal and converts it into a digital signal, and then the difference comparator 324 compares the digital signal, and modulates the digital signal according to the difference through the modulator 325, and the processed information is transmitted to the terminal by the calibration signal output line 4.

[0024] Working principle: When using a fiber optic current sensor calibrator, the conductor to be detected passes through the sensor detection head 2, and the current value detection and comparative calibration are completed in the fiber optic current sensor body 1. The signal processing circuit 263 in the electronic circuit part 26 processes the current information in the detection conductor. The light source 262 emits a laser beam from the light transmitting optical fiber 25, and the laser beam passes through the light receiving element 261 into the first light receiving optical fiber 23 and the second light receiving optical fiber 24, and generates polarized light through the polarizer 21. The filter 22 effectively filters out the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, and the signal processing circuit 263 processes the current signal.

[0025] The current signal processed by the electronic circuit part 26 is transmitted to the calibrator circuit part 32 and the equipment terminal respectively by the information transmission line 6 and the uncalibrated signal output line 5. After the current information enters the calibrator circuit part 32, the power amplifier 321 amplifies the current signal, and the proportional coil 322 converts the electrical signal into a mechanical displacement signal proportional to it. The mechanical displacement signal is then processed and converted into a digital signal by the proportional signal adjustment transmitter 323. The difference comparator 324 compares the digital signal, and modulates the digital signal according to the difference through the modulator 325. The processed information is transmitted to the terminal by the calibration signal output line 4. The optical fiber current sensor body 1 can be opened through the sensor box door 11 to facilitate the maintenance of the various components inside it.

Claims

1. A fiber optic current sensor calibrator, comprising a fiber optic current sensor body (1), a sensor detection head (2) and a calibration device (3), characterized in that: A sensor box door (11) is arranged on the front of the fiber optic current sensor body (1), and the calibration device (3) is connected to the sensor box door (11). A calibration display (31) is arranged on the calibration device (3). The sensing detection head (2) is arranged on one side of the fiber optic current sensor body (1), and a polarizer (21) is connected to the end of the sensing detection head (2) close to the fiber optic current sensor body (1), and a first light receiving optical fiber (23), a second light receiving optical fiber (24) and a light transmitting optical fiber (25) are connected to the side of the polarizer (21) away from the sensing detection head (2). A calibration signal output line (4) and an uncalibrated signal output line (5) are arranged on the side of the fiber optic current sensor body (1) away from the sensing detection head (2), and the uncalibrated signal output line (5) is arranged below the calibration signal output line (4).

2. The optical fiber current sensor calibrator according to claim 1, characterized in that: A filter (22) is provided at the connection between the first light receiving optical fiber (23) and the second light receiving optical fiber (24) and the polarizer (21); and an electronic circuit unit (26) is connected to one end of the first light receiving optical fiber (23) and the second light receiving optical fiber (24) and the light transmitting optical fiber (25) away from the polarizer (21).

3. The optical fiber current sensor calibrator according to claim 2, characterized in that: A light receiving element (261) is provided at the connection between the first light receiving optical fiber (23) and the second light receiving optical fiber (24) and the electronic circuit part (26), and a signal processing circuit (263) is connected to the two groups of light receiving elements (261) on the side away from the first light receiving optical fiber (23) and the second light receiving optical fiber (24), and a light source (262) is provided at the connection between the light transmitting optical fiber (25) and the electronic circuit part (26).

4. The optical fiber current sensor calibrator according to claim 3, characterized in that: The calibration device (3) is provided with a calibrator circuit section (32), and the calibration device (3) is connected to the electronic circuit section (26) and an information transmission line (6), and the information transmission line (6) and the uncalibrated signal output line (5) are both connected to the signal processing circuit (263).

5. The optical fiber current sensor calibrator according to claim 4, characterized in that: The calibrator loop part (32) is provided with a power amplifier (321), a proportional signal adjustment transmitter (323) and a modulator (325), and the power amplifier (321) is connected to an information transmission line (6), a proportional coil (322) is connected between the proportional signal adjustment transmitter (323) and the power amplifier (321), a difference comparator (324) is connected between the proportional signal adjustment transmitter (323) and the modulator (325), and the modulator (325) is also connected to a calibration signal output line (4).

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