Fiber torsion sensor with high sensitivity and without temperature cross interference

Abstract

The present invention discloses a fiber torsion sensor with high sensitivity and without temperature cross interference. The sensor comprises a first single mode fiber, a second single mode fiber, a first dislocation fusion point, a second dislocation fusion point, a first fine core fiber, a second fine core fiber and a taper fine core fiber. The connection point of dislocation fusion the first single mode fiber and the first fine core fiber forms a first dislocation fusion point. The two ends of the taper fine core fiber are respectively connected with the first fine core fiber and the second fine core fiber. The connection point of dislocation fusion the first fine core fiber and the second single mode fiber forms a second dislocation fusion point. When usage, the first single mode fiber is connected with a broadband light source, and the second single mode fiber is connected with a spectrograph; and the position and the intensity of the resonance wavelength on the spectrograph are monitored in real time to realize the high-sensitivity fiber torsion measurement without temperature cross interference. Compared to the prior art, the fiber torsion sensor with high sensitivity and without temperature cross interference can realize the measurement of the multiple physical parameters at the same time, is high in sensitivity, large in dynamic range, simple in structure, low in cost, and easy to integrate.

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...

AI Technical Summary

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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