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Distributed sensing system based on Michelson-Sagnac optical fiber interferometer

A fiber optic interferometer and sensing system technology, which is applied in the use of optical devices to transmit sensing components, convert sensor outputs, instruments, etc., can solve problems such as inability to locate, and achieve high-precision positioning and long-distance distribution. The effect of optical fiber sensing sensitivity and positioning accuracy

Active Publication Date: 2020-03-06
FUDAN UNIV
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Problems solved by technology

The invention can improve the long-distance distributed optical fiber sensing sensitivity and positioning accuracy, expand the frequency response range of the distributed optical fiber sensing system, and solve the problem that the traditional solution cannot be positioned when it is applied to the positioning of buried optical cables

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  • Distributed sensing system based on Michelson-Sagnac optical fiber interferometer
  • Distributed sensing system based on Michelson-Sagnac optical fiber interferometer
  • Distributed sensing system based on Michelson-Sagnac optical fiber interferometer

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Embodiment Construction

[0054] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0055] The present invention is based on Michelson-Sagnac optical fiber interferometer distributed sensing system such as figure 1 As shown, the narrow-band laser used in the system is a distributed feedback laser (DFB) with a center wavelength of 1550.12nm, and the broadband light source is a superluminescent light-emitting diode (SLD). light source. After the laser light enters the 3×3 fiber coupler, it will be divided into three beams of equal power, one of which will be coupled out of the core when passing through the knotted fiber. An optical isolator eliminates optical reflections, and four photodetectors PD1, PD2, PD3, and PD4 are used for photoelectric conversion. Between wavelength division multiplexer 2 (WDM2) and wavelength division multiplexer 3 (WDM3), there is a time delay fiber (TDF), which is located in the center of the ce...

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Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a distributed sensing system based on a Michelson-Sagnac optical fiber interferometer. According to the system, two arms of a Michelson optical fiber interferometer are used as sensing arms, and the two sensing arms are distinguished through adoption of a signal analysis algorithm; and the two interferometers detect the same time-varying disturbance at the same time, add and subtract the demodulated phases to obtain two paths of signals with time delay, and obtain the time delay related to the disturbance position through cross-correlation, so that the disturbance position information can be calculated. The maximum detection distance of the system can reach 140 km, and no blind area exists. According to the system provided by the invention, the Michelson-Sagnac hybrid optical fiber interferometer is utilized to realize distributed optical fiber sensing and positioning, the sensitivity andpositioning precision of long-distance distributed sensing are improved, the frequency response range of a distributed optical fiber sensing system is expanded, and the problem that positioning cannot be achieved when a traditional scheme is applied to buried optical cable positioning is solved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a distributed sensing system based on a Michelson-Sagnac optical fiber interferometer. Background technique [0002] Distributed fiber optic sensors are often used in perimeter security, oil pipeline leakage monitoring, power cable damage monitoring, bridge safety monitoring and other fields. The optical fiber integrates sensing and transmission, and can carry out continuous vibration or temperature measurement on the entire length of the optical fiber, and at the same time obtain the specific position of the measured object. The distributed optical fiber sensing system based on Michelson optical fiber interferometer has the characteristics of two-arm sensing and high sensitivity to low frequency signals. However, in the distributed sensing and positioning applications using this structure, no matter it is based on time delay estimation or notch point algorithm, it...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35322G01D5/35325
Inventor 贾波宋秋衡吴红艳
Owner FUDAN UNIV
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