Micro-displacement sensor based on spherical optical fiber and Bragg grating cascade

Abstract

Disclosed is a micro-displacement sensor based on spherical optical fiber and Bragg grating cascade. An incident end single-mode optical fiber, the spherical optical fiber and a Bragg grating are serially connected to form the micro-displacement sensor, the diameter of the spherical optical fiber ranges from 160 micrometers to 180 micrometers, and the distance between the spherical optical fiber and the Bragg grating is shorter than 2cm. The micro-displacement sensor has the advantages that micro-displacement is measured by the aid of the micro-displacement sensor based on spherical structure and Bragg grating cascade, treatment such as corrosion and grinding needed by a traditional grating sensor is avoided, manufacturing difficulty and cost are reduced, micro-displacement measuring sensitivity is effectively improved by measuring the power of a reflection peak of a grating backward cladding mode, the sensor cannot be affected by temperature, stability is improved, and the micro-displacement sensor is compact in design, convenient to use and low in cost.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to a micro-displacement sensor based on spherical optical fiber and Bragg grating cascaded. Background technique [0002] With the development of optical fiber communication related fields, optical fiber sensing technology has made great progress. Among them, micro-displacement sensors are widely used in industrial production, environmental safety, and clinical testing. As an important parameter to reflect the state of objects, micro-displacement plays an important role in production practice. There are many micro-displacement methods known at present. Because optical fiber sensors have many advantages such as small size, low cost, anti-electromagnetic interference, high sensitivity and corrosion resistance, optical fiber micro-displacement sensors have aroused widespread interest in the application field. [0003] For conventional fiber grating sensors, the light energy is c...

AI Technical Summary

Problems solved by technology

However, the geometric size after etching is irregular, the production is complicated, and the repeatability is poor.

The mechanical strength of special light-splitting structures such as eccentric structure, tapered structure, laser etching, etc. is difficult to guarantee and is easy to break

Micro-displacement sensors are generally susceptible to temperature, and cross-sensitivity occurs, which also restricts the accuracy of micro-displacement sensors

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