Transverse stress sensing system of photonic crystal fiber written with grating and implementing method thereof

Abstract

The invention relates to an optical sensing system for detecting the transverse stress strain. Wherein, the laser outputs light to the polarize controller, to be coupled into the zero double refract or high refract photon crystal optical fiber which is marked with long-period grating and inside the forced unit to sense the external transverse stress; the spectrum detector connected to the output detects the transparent spectrum and outputs the detected information to the signal processing and displaying unit to attain the detect result of transverse stress; the output light of laser via the light circulator is coupled into the photon crystal optical fiber of Prague grating; the photon crystal optical fiber is inside the forced unit; the signal light reflected from the Prague grating via the light circulator is output to the spectrum detector to detect the reflect spectrum and output the detected information to the signal processing and displaying unit to attain the detect result of transverse stress.

Description

technical field [0001] The present invention relates to an accurate and sensitive optical fiber sensing system to measure transverse stress or strain, in particular a grating-written photonic crystal fiber based on a grating-written zero-birefringence photonic crystal fiber or a high-birefringence photonic crystal fiber Lateral stress sensing system and implementation method. Background technique [0002] The safety and quality monitoring of buildings is mainly to detect the stress and deformation under the action of external force. The general detection method is to install a large number of distributed strain gauges or other strain-sensing fibers in the building materials. Since the composite structure composed of fiber materials and building materials can properly improve the strength of building materials, the use of composite fiber materials for building loads Deformation detection is a relatively common method. Embed optical fibers in building materials or buildings ...

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Problems solved by technology

[0015] At present, the research on temperature and stress sensing using photonic crystal fiber has begun, but because the application of photonic crystal fiber has just started, and the detection of transverse stress is relatively difficult, so there is still no transverse stress sensor based on photonic crystal fiber. related reports

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