Sub-nanometer strain level multi-point multiplexing fiber grating quasi-static strain sensing system

A fiber grating and strain sensing technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of complex modulation technology, failure to provide multi-point multiplexing methods for sensors, etc., to improve system resolution, improve Effect of Sensing Bandwidth, Simplified Complexity

Active Publication Date: 2018-01-30
朴牛(上海)科技有限公司
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Problems solved by technology

However, the modulation technology used in this scheme is complicated, and the laser can only realize the detection of a single sensor probe, and the effective multi-point multiplexing method for this type of sensor has not been given in the prior art

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  • Sub-nanometer strain level multi-point multiplexing fiber grating quasi-static strain sensing system
  • Sub-nanometer strain level multi-point multiplexing fiber grating quasi-static strain sensing system
  • Sub-nanometer strain level multi-point multiplexing fiber grating quasi-static strain sensing system

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Embodiment Construction

[0028] Such as figure 1 As shown, the optical pulse modulation mechanism in this embodiment includes: a narrow-linewidth laser for outputting a single-frequency laser, and the narrow-linewidth laser is sequentially connected to an optical phase modulator, an optical intensity modulator, and an acousto-optic modulator;

[0029] The fiber grating sensing mechanism includes: a fiber optic circulator, a fiber coupler, a time-delay fiber array, and a phase-shift grating array connected in series in sequence, wherein: the input end of the optical circulator is connected to the reflection end of the acousto-optic modulator, and the output end It is connected to the beam combining end of the multi-fiber coupler, and the reflection end is connected to the photodetector; one of the splitting ends of the multi-fiber coupler is preferably directly connected to a phase-shifted fiber Bragg grating as a reference sample, and the rest The split ends are respectively connected to one end of de...

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Abstract

A sub-nanometer strain level multi-point multiplexing fiber grating quasi-static strain sensing system, including: a signal generation and detection mechanism, an optical pulse modulation mechanism and a fiber grating sensing mechanism respectively connected thereto, wherein: the signal generation and detection mechanism Output modulation information to the optical pulse modulation mechanism, so that the optical pulse modulation mechanism generates modulated optical pulses and outputs them to the fiber grating sensing mechanism, and the reflected light signal of the fiber grating sensing mechanism is collected and detected by the signal generation and detection mechanism; the present invention It can simultaneously have the advantages of high measurement accuracy, high sensing bandwidth, and low multiplexing cost.

Description

technical field [0001] The present invention relates to a technology in the field of optical fiber sensing, in particular to a technology with a resolution reaching the sub-nanometer strain level (<10 -9 ε), and can realize multi-point multiplexing fiber grating quasi-static strain sensing system. Background technique [0002] Fiber Bragg grating sensing mechanism technology is one of the important branches of fiber optic sensing technology. Its characteristics include high measurement accuracy, small size, low cost, anti-electromagnetic interference, etc., and has high application value. Among them, the fiber grating strain sensor has the most mature development and is widely used in various artificial structures or natural structures to realize the sensing and observation of strain. [0003] Geophysics-related research is one of the important application scenarios of FBG strain sensing systems, such as the study of the micro-change process of the crust in geological st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 何祖源刘庆文樊昕昱陈嘉庚
Owner 朴牛(上海)科技有限公司
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