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A mode-locked laser-type all-fiber-optic current transformer

A technology of current transformers and mode-locked lasers, applied in the direction of voltage/current isolation, etc., to solve the problem of poor real-time performance and low hardware requirements

Inactive Publication Date: 2018-01-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two demodulation schemes require a large amount of data processing. In order to ensure the real-time performance of the sensor, the simplicity and hardware requirements of the signal processing algorithm are relatively high.

Method used

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  • A mode-locked laser-type all-fiber-optic current transformer
  • A mode-locked laser-type all-fiber-optic current transformer

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Experimental program
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Embodiment Construction

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] like figure 2 As shown, the present invention includes: a laser pump source 1, a wavelength division multiplexer 2, an erbium-doped fiber 3, a matching fiber 4, a Y-waveguide integrated optical chip used in reverse 5, a 45° fiber melting point 6, a piezoelectric ceramic modulation 7, delay line fiber 8, quarter wave plate 9, fiber sensing ring 10, first mirror 11, second mirror 12, signal generator 13, photodetector 14 and oscilloscope 15; pumped by a laser The light emitted by Puyuan 1 enters one end of the Y-waveguide integrated chip 5 used in the opposite direction through the wavelength division multiplexer 2, the erbium-doped fiber 3, and the matching fiber 4. The laser becomes linearly polarized light, and then passes through the 45° fiber melting point 6. The original linearly polarized light becomes two mutually orthogonal linearly polari...

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Abstract

The invention discloses a mode-locked laser type all-fiber current transformer. Including laser pump source, wavelength division multiplexing device, erbium doped fiber, matching fiber, Y waveguide integrated optical chip used in reverse, 45° fiber melting point, piezoelectric ceramic modulator, fiber delay line, quarter wave plate , optical fiber sensing ring, first reflector, second reflector, signal generator, photodetector and oscilloscope. For the current transformer proposed by the present invention, the size of the current to be measured can be obtained only by detecting the time-domain offset of the mode-locked pulse with an oscilloscope during signal demodulation, so the transformer based on this system does not need complex signal processing, and the circuit The system hardware requirements are very low, which can solve the disadvantages of poor real-time performance of traditional open-loop demodulation and closed-loop demodulation.

Description

technical field [0001] The invention relates to a current transformer, in particular to a mode-locked laser type all-fiber current transformer. Background technique [0002] The all-fiber current transformer has been widely concerned by researchers since it was proposed. Compared with the traditional electromagnetic mutual inductance current transformer, it has many advantages, such as high intrinsic insulation safety, large dynamic range, anti-electromagnetic interference, Realize remote control, light weight, small size, etc. At present, the most widely studied all-fiber current transformer structures, such as figure 1 shown. The light emitted by the broad-spectrum light source 16 passes through the fiber coupler 17, is polarized into linearly polarized light by the polarizer 18, and is divided into two mutually orthogonal linearly polarized lights through the 45-degree fusion point 6, and is then provided by the lock-in amplifier 19. The modulated signal of the phase m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/24
Inventor 魏兵李宇波周柯江赵昌云卞强
Owner ZHEJIANG UNIV