A Highly Sensitive Optical Fiber Torsion Sensor Without Temperature Cross Interference

Abstract

The invention discloses a high-sensitivity optical fiber torsion sensor without temperature cross-interference, comprising first and second single-mode optical fibers, first and second dislocation fusion splicing points, first and second thin-core optical fibers, and tapered thin-core optical fibers; the first The connection point of the single-mode optical fiber and the first thin-core optical fiber dislocation fusion splicing constitutes the first dislocation fusion splicing point; the two ends of the tapered thin-core optical fiber are respectively connected to the first and second thin-core optical fibers; the second thin-core optical fiber and the second single-mode optical fiber The connection point of dislocation fusion splicing of the optical fiber constitutes the second dislocation fusion splicing point. When in use, the first single-mode fiber is connected to a broadband light source, and the second single-mode fiber is connected to a spectrometer; through real-time monitoring of the resonant wavelength position and power intensity on the spectrometer, high-sensitivity fiber torsion measurement without temperature cross-interference can be realized . Compared with the prior art, the present invention can realize simultaneous measurement of multiple physical parameters, high sensitivity, large dynamic range, simple structure, low price, easy integration and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber torsion measurement, and in particular relates to a high-sensitivity optical fiber torsion sensor without temperature cross-interference based on a tapered thin-core dislocation welding structure. Background technique [0002] High-sensitivity fiber optic torsion sensors play a very important role in structural health monitoring, but in real life, the measured torsion sensitivity is often inaccurate due to the interference of external factors such as temperature. Therefore, realizing an optical fiber sensor that has no temperature cross-interference and can also monitor changes in temperature and torsion in real time will be widely used in the engineering field. Compared with ordinary electronic and mechanical torsion sensors, fiber optic torsion sensors have irreplaceable advantages such as anti-electromagnetic interference, high sensitivity, low cost, easy fabrication, and simple demodulat...

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Problems solved by technology

[0004] In view of the above defects and improvement needs of the prior art, the present invention provides a high-sensitivity optical fiber torsion sensor without temperature cross-interference, which realizes real-time monitoring of temperature and torsion, and overcomes the temperature cross-interference, low torsion sensitivity and Technical problems such as small dynamic measurement range

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