Simplifying type multiplexing white light interference optical fiber sensing demodulating equipment

Abstract

The invention provides a simplified multiplexing white light interference fiber sensing demodulating device, which comprises a single-fiber two-way optical transmitting / receiving module, an optical fiber resonant cavity, a single-mode transmission fiber, and an optical fiber sensing array, wherein the single-fiber two-way optical transmitting / receiving module is composed of a semiconductor light source as the transmitting terminal, a semiconductor photodetector as the receiving terminal and related devices packaged together; and an optical fiber annular cavity is composed of an optical fiber coupler, an optical fiber self-focusing lens and a movable corner reflector. The device can achieve enquiry and measurement of a plurality of optical fiber sensors by embedding the single-fiber two-way optical transmitting / receiving module and the optical fiber resonant cavity in the single-mode optical fiber, and has the advantages of simple structure, easy implementation, no length restriction of the transmission cable, no influence caused by the external environment, and good stability and reliability. The device can be used for the measurement of physical quantities such as distributed deformation, strain and temperature, and can be used for multi-task sensing, multi-element sensing, local strain sensing, large-scale deformation sensing, etc.

Description

(1) Technical field [0001] The invention relates to a measuring device, in particular to a simplified multiplexing optical fiber array sensor for sensing and demodulation of a white light optical fiber interferometer. (2) Background technology [0002] Fiber-optic interferometers using low-coherence, broadband light sources are often referred to as white-light fiber interferometers. A typical fiber optic white light interferometer such as figure 1 As shown, its structural composition is to use optical fiber to build a Micheslon interferometer, and use a wide-spectrum light source LED or ASE to drive the interferometer to provide light energy, and use the detector to detect white light interference fringes to achieve the measurement of the physical quantity to be measured. Its working principle is as follows. After the broadband light emitted by the broadband light source 11 enters the single-mode fiber, it is divided into two beams by the 3dB single-mode fiber 2×2 coupler 1...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the complex structure of this type of optical fiber interferometer, the optical fiber cable used for connection is related to the measurement, the measurement reliability is poor, the stability is low, etc., and to provide a simple structure, high multiplex number, large measurement range and high measurement accuracy. A simplified multiplexing white light interference optical fiber sensing and demodulation device

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