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Intensity modulation type sensing device based on Brillouin phase shift

A technology of intensity modulation and sensing devices, applied in the direction of transmitting sensing components with optical devices, can solve the problems of low stability, complexity and high cost, and achieve the effect of easy integration, simple device and easy realization

Inactive Publication Date: 2015-12-09
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of high complexity, high cost and low stability of distributed optical fiber sensing devices in the prior art, and proposes an intensity modulation type sensing device based on Brillouin phase shift

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  • Intensity modulation type sensing device based on Brillouin phase shift
  • Intensity modulation type sensing device based on Brillouin phase shift
  • Intensity modulation type sensing device based on Brillouin phase shift

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Embodiment Construction

[0018] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] The present invention provides an intensity modulation sensing device based on Brillouin phase shift, such as figure 1 As shown, it includes a laser 1, an optical coupler 2, a polarization controller 3, an electro-optic intensity modulator 4, a microwave signal generator 5, a polarization scrambler 6, a first erbium-doped fiber amplifier 7, an optical isolator 8, and a test fiber 9 , acousto-optic modulator 10, pulse signal generator 11, second erbium-doped fiber amplifier 12, circulator 13, Bragg grating 14, photodetector 15, electric bandpass filter 16, quadrature demodulator 17 and oscilloscope 18 .

[0020] The center frequency of the optical carrier output by laser 1 is f L , the optical carrier is divided into two parts by the 50:50 coupler 2, that is, the first optical carrier and the second optical carrier.

[0021] The microwave signal...

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Abstract

The invention discloses an intensity modulation type sensing device based on Brillouin phase shift, and the device enables a light carrier generated by a light source to be divided into two parts, wherein one part is externally modulated by an electric pulse to generate pulse pump light, and the other part is externally modulated by an electric light intensity modulator working at a linear working point to generate detection light and local light through a 10-12GHz microwave signal. The detection light and the pulse pump light interact with each other in a testing optical fiber, and then generate a 10-12GHz high-frequency signal with the local light through beat frequency, wherein the phase is directly demodulated by a 9-12GHz broadband quadrature demodulator, thereby avoiding advanced frequency shift, reducing the complexity and cost of the device, and improving the stability of the device.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and in particular relates to the design of an intensity modulation sensing device based on Brillouin phase shift. Background technique [0002] The distributed optical fiber sensing technology based on the Brillouin effect has been extensively studied for many years, and now it can achieve a sensing length greater than 100 km and a sensing accuracy of cm level. Before 2012, distributed Brillouin fiber sensing was based on the measurement of the Brillouin gain spectrum, and the device was simple and easy to demodulate. The relatively big problem is that in long-distance sensing, there are non-local effects due to the consumption of pump light, which will increase the inaccuracy of demodulation at the end of the fiber. In 2012, A. Zornoza et al. proposed to use a quadrature demodulator to demodulate the Brillouin phase spectrum to realize temperature and stress sensing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
Inventor 彭玉兰
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD