Phase-light time domain reflection device and method based on heterodyne detection phase demodulation

A technology of optical time domain reflection and phase demodulation, applied in measuring devices, using wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, etc., to achieve high-sensitivity effects

Active Publication Date: 2015-08-05
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the above methods all use the light intensity change caused by the phase change for vibration sensing, rather than directly using the phase change for vibration sensing. Considering that the sensiti...

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  • Phase-light time domain reflection device and method based on heterodyne detection phase demodulation
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  • Phase-light time domain reflection device and method based on heterodyne detection phase demodulation

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Embodiment Construction

[0033] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] The present invention proposes a phase optical time domain reflection device based on heterodyne detection and phase demodulation. device 04, erbium-doped fiber amplifier 05, narrow-band fiber filter 06, first adjustable optical attenuator 07, three-port circulator 08, sensing fiber 09, fiber coupler 10 with a coupling mode of 2×1, and photodetector 11. A signal acquisition and processing module 12, an arbitrary waveform generator 13, a power amplifier 14 and a second adjustable optical attenuator 15, the narrow linewidth laser 01 is connected to the first 1×2 fiber coupler 02 through a connecting optical fiber A port 021, the second port 022 of the 1×2 fiber coupler 02 is connected to the fiber input port of the AOM 04 through the polarization controller 03, and the fiber output port of the AOM 04 is sequentially passed through the e...

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Abstract

The invention relates to the field of optical fiber sensing, specifically a phase-light time domain reflection device and method based on heterodyne detection phase demodulation. The device consists of a narrow linewidth laser, an optical fiber coupler with a coupling model of 1*2, a polarization controller, a sound-light modulator, an erbium-doped optical fiber amplifier, a narrow-band optical fiber filter, a first variable optical attenuator, a three-port circulator, a sensing optical fiber, an optical fiber coupler with a coupling model of 2*1, a photoelectric detector, a signal collection and processing module, an arbitrary waveform generator, a power amplifier, and a second variable optical attenuator. The device and method enable the heterodyne detection phase demodulation to be combined together, achieve external vibration sensing through direct phase demodulation, and are higher in sensitivity. In addition, the device and method employ a brand new direct phase modulation method to sense the external vibration, so the positioning method, compared with a conventional method, of each vibrating point is different.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a phase optical time domain reflection device and method based on heterodyne detection and phase demodulation. Background technique [0002] Distributed optical fiber sensing technology has been widely used for its advantages of continuous sensing of temperature, strain and other parameter changes at any point along the optical fiber, optical fiber integrating signal sensing and transmission, and convenient for long-distance sensing and large-scale networking. All aspects of the national economy and people’s daily life, including structural safety monitoring of buildings, bridges, dams, tunnels, river embankments, aircraft, ships, factory equipment, etc., leak detection in dangerous places such as oil pipelines and high-voltage lines, and border intrusion Real-time monitoring and fault point detection of communication optical cables. [0003] Optical time domain reflection t...

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Application Information

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IPC IPC(8): G01H9/00
Inventor 陈伟孟洲宋章启张学亮熊水东胡晓阳陈默涂晓波
Owner NAT UNIV OF DEFENSE TECH
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