Apparatus for sensing demodulating double-datum length low coherent optical fiber ring network

Abstract

The invention provides a double reference length low coherent optical fiber ring network sense demodulating equipment, comprising a wide spectrum optical source, a photo detector, an optical fiber 4*4 coupler, a self-focusing lens, a pyramid plane reflector groups, a monomode fiber, an optical fiber ring network composed a plurality of optical fiber sensors with different lengths in series; the wide spectrum optical source and the photo detector are connected with the two optical fiber input ends of the optical fiber 4*4 coupler, and the other two optical fiber input ends of which are respectively connected with the self-focusing lens, which the two optical fiber output ends of the optical fiber 4*4 couple are connected with the optical fiber ring network through the monomode fiber, and the other two optical fiber output ends of which are respectively connected with the self-focusing lens. According to the invention, through the durable optical fiber ring chamber of the double reference optical path, the expansion of the optical path scanning range can be realized, and the multiplexing number of the sensors is added, which has simple structure, easy implement, high accuracy of measurement and low cost and the like.

Description

(1) Technical field [0001] The present invention relates to a measuring device, in particular to a method for demodulating a double reference length low-coherence ring network and a sensing device thereof (2) Background technology [0002] Fiber-optic interferometry systems using low-coherence light sources with broad spectra and very short coherence lengths are known as fiber-optic white-light interferometers. As a branch of interference technology, fiber optic white light interferometer is insensitive to electromagnetic interference, has high frequency response and strong environmental adaptability. The white light interference signal has a good contrast, and the optical fiber white light interference has a wide range of applications in high-precision positioning. The optical fiber in the interferometer is very thin, which has little effect on the strength of the matrix material, and can be easily embedded in the structural material. It is one of the sensors with a smart ...

AI Technical Summary

Problems solved by technology

In order to achieve simultaneous demodulation of large and small scale sensors in an optical fiber sensing system, the current method is to replace it with an optical delay structure with a long optical path scanning length, which will increase the difficulty and volume of the system exponentially; if It is necessary to maintain the measurement accuracy, measurement stability, reliability and other technical indicators of large and small sensors at the same time, and to reduce the influence of environmental factors such as temperature and vibration on the optical path scanning mechanism, which will lead to a geometric increase in the complexity and cost of the system

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