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Minitype optical DC/AC electric field sensor

An electric field sensor and optical sensing technology, applied in the field of optoelectronics, can solve the problems of the lack of effective methods for direct measurement of DC high voltage and the difficulty of realizing the modulation of the DC voltage to be measured, etc., and achieve high bandwidth, reliable measurement, long-term and stable measurement effect

Inactive Publication Date: 2009-04-15
湾世伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, in the actual operation of HVDC transmission lines, it is difficult to modulate the DC voltage to be measured up to hundreds of thousands of volts, which makes it difficult to directly measure the DC high voltage by optical methods.

Method used

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  • Minitype optical DC/AC electric field sensor
  • Minitype optical DC/AC electric field sensor
  • Minitype optical DC/AC electric field sensor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0117] Such as figure 2 As shown, the beam emitted by the broadband light source 28 passes through the polarizer 25, first passes through a depolarizer 24, and then is polarized and split and modulated when passing through the optical phase modulator 40, and the output two independent orthogonal linearly polarized mode beams The fast and slow polarization axis orientations of a polarization-maintaining optical fiber 37 are respectively transmitted to the electro-optic crystal.

[0118] The two orthogonal linear polarization directions of the incident linear polarization transmitted by the polarization-maintaining light 37 to the crystal are aligned parallel to the crystal intrinsic polarization axis (x', y') (that is, at 45 degrees to the crystal axis), and the corresponding refraction The rates are:

[0119] n±Δn (8)

[0120] Among them, n: the refractive index of the electro-optic crystal when there is no external electric field;

[0121] Δn: Due to the linear electro-op...

no. 2 example

[0162] As shown in Figure 3, after the light beam emitted by the broadband light source 28 passes through the polarizer 25, it first passes through a depolarizer 24, and then is polarized, split, and modulated when passing through the optical phase modulator 40, and the output two independent orthogonal The linearly polarized mode beams are respectively transmitted to the electro-optic crystal in the directions of the fast and slow polarization axes of the same polarization-maintaining fiber 37 .

[0163] The two orthogonal linear polarization directions of the incident linear polarization transmitted to the electro-optic crystal by the polarization-maintaining optical fiber 37 are aligned parallel to the crystal intrinsic polarization axis (x′, y′; that is, 45 degrees to the crystal axis respectively), and the corresponding The refractive indices are:

[0164] n±Δn (21)

[0165] Among them, n: the refractive index of the electro-optic crystal when there is no external electr...

no. 3 example

[0238] Such as Figure 4 As shown, the light beam emitted by the broadband light source 28 passes through the polarizer 25, passes through the depolarizer 24, and then is polarized, split, and modulated when passing through the optical phase modulator 40 to give two independent parallel polarization modes, which are composed of two The root polarization-maintaining fiber 37 each transmits a polarization mode to the polarization combiner 38, and the two independent orthogonal polarization modes formed are input in directions parallel to the intrinsic polarization axis of the electro-optic crystal.

[0239] The signal generator gives a pulse rectangular voltage signal which is applied to the optical phase modulator 40 to form a square wave π / 2 phase delay dynamic bias between two independent orthogonal polarization modes.

[0240] An analyzer 27 is placed at the beam output end of the crystal, and its optical axis is at 45 degrees to the intrinsic polarization axes of the two cr...

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Abstract

The invention provides a micro optical DC / AC electric-field sensor for eliminating the drift error of electric charges, capable of being used for measuring the voltage of a high-voltage DC transmission line by an optical method. Two transparent electrodes formed on an electro-optical crystal light-pass end surface used in an optical sensing module are electrically and compactly connected with two output terminals of an optical relay respectively. A secondary light source transmits the light beam that is open and is cut off periodically to a light beam collecting window of an the relay by auxiliary optical fiber under the coordinated control of a signal processing and control module, and the light beam that is open and is cut off periodically is used for controlling the breakover and the break of a circuit at the output end of the optical relay; the modulation to the DC electric field to be tested which is externally added on an electro-optical crystal can be realized, so that the DC electric field to be tested is periodically applied and eliminated on the electro-optical crystal. The error caused by space charge drift in the electro-optical crystal used when the DC electric field is measured can be controlled within bounds by the micro optical DC / AC electric-field sensor, thus realizing the long-term, stable, reliable and precise measurement on the DC electric field with the optical method.

Description

technical field [0001] The invention belongs to the field of optoelectronics. Background technique [0002] Optically accurate measurement of DC voltages in high voltage environments is becoming increasingly important in the power industry. Compared with the existing conventional technology, the advantages of optical measurement technology are: [0003] - Strong ability to resist electromagnetic interference; [0004] - No core saturation problem; [0005] - No ferroresonance problems; [0006] - Excellent electrical insulation properties; [0007] - Large bandwidth; [0008] - Large dynamic range; [0009] - High precision in the full dynamic range; [0010] - light weight; [0011] -small volume; [0012] - good security; [0013] - Low maintenance costs; [0014] - digital output; [0015] - friendly to the environment; etc. [0016] However, in common optical voltage transformer schemes, discrete optical components, specific electrode structures and specific...

Claims

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Application Information

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IPC IPC(8): G01R15/24G01R19/00
Inventor 湾世伟
Owner 湾世伟
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