Temperature insensitive optical fibre grating acceleration sensor

Abstract

The invention discloses a temperature-insensitive optical fiber grating acceleration sensor, which comprises an outer casing used as a support structure of the acceleration sensor, an optical fiber grating used to measure acceleration, a shaft fixed on the front sidewall and the back sidewall of the acceleration sensor, an L-type lever arranged on the shaft and a mass block fixed on the horizontal end part of the lever, wherein one end of the optical fiber grating is fixed on the inner wall of one end of the acceleration sensor, while the other end parallelly passes through the small hole on the other end of the acceleration sensor and extends outside the acceleration sensor; the L-type lever is used to send vibration signal to the optical fiber grating connected with the lever, and the folding point of the cross part of the vertical part and the horizontal part of the L-type lever is in movable connection with the shaft; and the mass block is used to adjust the sensitivity and the natural vibration frequency of the sensor. The optical fiber grating acceleration sensor increases sensitivity and improves packaging technology.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a temperature-insensitive optical fiber grating acceleration sensor. Background technique [0002] Compared with the corresponding conventional sensors, optical fiber sensors also have obvious advantages in terms of sensitivity, dynamic range, and reliability. They are particularly prominent in the fields of national defense and military applications, and are listed as key national defense technologies by many countries. [0003] Optical fiber accelerometer is an instrument that uses the light transmission characteristics of optical fiber and various modulation effects generated by its interaction with the surrounding environment to detect vibrations on the ground, in the air or on the seabed. Compared with the traditional piezoelectric accelerometer, it has the following main advantages: wide frequency range, high sound pressure sensitivity, no electromagnetic inte...

AI Technical Summary

Problems solved by technology

In this technical solution, on the one hand, the gate area of ​​the fiber grating is directly encapsulated by glue, which is easy to cause chirp of the fiber grating; Sensitivity

In addition, since the cantilever beam is machined from metal, it is sensitive to temperature changes and requires additional temperature compensation techniques

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