Optical fiber displacement sensor and measuring method thereof

Abstract

The invention discloses an optical fiber displacement sensor and a measuring method thereof. The optical fiber displacement sensor comprises a substrate and an optical fiber sensor; the substrate comprises a fixed plate, a turning plate and a connecting piece; a lower turning plate part is parallel to the fixed plate, a corner is of an obtuse angle in the direction facing the fixed plate, and thefixed plate is connected with the turning plate by the connecting piece through a through hole of the fixed plate and a through hole of the turning plate; a first optical fiber groove and a second optical fiber groove are staggered in parallel, located in the sizes, facing each other, of the fixed plate and the lower turning plate part respectively, and used for fixing the optical fiber sensor; the top end of an upper turning plate part serves as a contact end making contact with a measured object; and the optical fiber sensor comprises an optical fiber, and a first Bragg grating and a secondBragg grating which are etched on a fiber core of the optical fiber. Displacement of the measured object is amplified through the substrate and converted into axial tension to the first Bragg grating.The optical fiber displacement sensor has the advantages of being small in size, free of electromagnetic interference, long in signal transmission distance and high in measurement precision.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an optical fiber displacement sensor and a measuring method thereof. Background technique [0002] Displacement measurements are an important monitoring metric for assessing the health of structures in many fields, including civil, industrial, and aerospace engineering. The current mainstream displacement sensors are based on electronic sensing technology, such as capacitive and magnetoresistive displacement sensors. However, displacement sensors based on electronic sensing technology have low long-term stability, poor durability, and are susceptible to high-intensity electromagnetic interference. Displacement sensors based on fiber Bragg gratings have the advantages of anti-electromagnetic interference, corrosion resistance, and the ability to accommodate multiple measuring points in one fiber, and have attracted widespread attention in recent years. At present, some optical f...

AI Technical Summary

Problems solved by technology

At present, the mainstream optical fiber displacement sensors all have the problem of large volume. Therefore, it is of great significance to study a small volume and high sensitivity optical fiber displacement sensor.

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