Distributed optical fiber sensing system based on phase generated carrier technology

A phase-generated carrier wave and distributed optical fiber technology, which is applied in the use of optical devices to transmit sensing components, the use of wave/particle radiation, and the measurement of ultrasonic/sonic/infrasonic waves. It can solve problems such as interference destructive fading and achieve dynamic measurement. , Eliminate the problem of phase cancellation and fading, and the effect of low cost
CN103759750AActive Publication Date: 2014-04-30INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Publication Date
2014-04-30

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Abstract

A distributed optical fiber sensing system based on the phase generated carrier technology comprises a narrow-linewidth laser device, a modulator, an optoisolator, an erbium-doped optical fiber amplifier, an optical circulator, a fiber grating, a sensing fiber, a Michelson interferometer, a carrier circuit, a photoelectric detector, a data acquisition card, a signal processor and a pulse generator. The input end of the modulator is connected with the output end of the narrow-linewidth laser device. The input end of the optoisolator is connected with the output end of the modulator. The input end of the erbium-doped optical fiber amplifier is connected with the output end of the optoisolator. A port a of the optical circulator is connected with the output end of the erbium-doped optical fiber amplifier. The fiber grating is connected with a port b of the optical circulator. The output end of the carrier circuit is connected with an electrical interface of the Michelson interferometer. The input end of the photoelectric detector is connected with the output end of the Michelson interferometer. One input end of the data acquisition card is connected with the output end of the photoelectric detector, and the other input end of the data acquisition card is connected with the output end of the carrier circuit. The input end of the signal processor is connected with the output end of the data acquisition card. The input end of the pulse generator is connected with the trigger input end of the data acquisition card, and the output end of the pulse generator is connected with an electrical interface of the modulator.
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Description

technical field

[0001] The invention relates to the field of distributed optical fiber sensing, in particular to the field of distributed optical fiber sensing for measuring dynamic vibration or acoustic signals. Background technique

[0002] Distributed optical fiber sensing technology is an important branch of optical fiber sensing. It can continuously monitor the temperature, strain, vibration and Physical quantities such as sound have good application prospects and occupy a major position in the optical fiber sensing market.

[0003] According to the sensing principle, distributed optical fiber sensing technology can be mainly divided into two types based on interference principle and backscattering detection technology. The former uses the M-Z type, Sagnac type and composite structure to obtain relevant location information and external physical information through positioning algorithms and demodulation algorithms. The latter uses changes in polarization, light inten...

Claims

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