Temperature-insensitive elliptical hinge fiber Bragg grating acceleration sensor

Abstract

The invention discloses a temperature-insensitive elliptical hinge fiber Bragg grating acceleration sensor. The fiber Bragg grating sensor comprises a sensor shell, a core body and two fiber Bragg gratings, the core body is composed of an inertia mass block, an oval flexible hinge and a base, the inertia mass block is symmetrical about the flexible hinge and is higher than the other side connectedwith the flexible hinge, and optical fiber grooves are formed in the inertia mass block and the upper and lower tops of the base opposite to the inertia mass block. The optical fibers penetrate through the optical fiber grooves and come out of the holes of the shells at the two sides, the optical fibers are engraved with gratings between the inertia mass block and the base, the flexible hinge isan oval flexible hinge, and the inertia mass block generates the relative displacement around the flexible hinge, so that the fiber gratings generate the relative displacement. The temperature-insensitive elliptical hinge fiber Bragg grating acceleration sensor is small in size and higher in frequency measurement range, is easy to package, and is insensitive to temperature.

Description

technical field [0001] The invention relates to an acceleration sensor, which belongs to the technical field of optical fiber sensing, in particular to a temperature-insensitive elliptical hinge fiber grating acceleration sensor. Background technique [0002] As a passive device, Fiber Bragg Grating has the advantages of small size, light weight, high precision, anti-electromagnetic interference, wavelength division multiplexing, corrosion resistance, long transmission distance, intrinsic explosion-proof, and suitable for harsh environments compared with traditional sensors. And a series of advantages, it has great application prospects in the fields of aerospace, national defense construction and health detection. The acceleration sensor uses the fiber Bragg grating as the sensing element, inherits a series of advantages of the fiber grating, and realizes the distributed measurement of the acceleration signal by converting the external acceleration signal into the wavelengt...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing fiber grating acceleration sensors are cantilever beam type, diaphragm type and hinge type, but due to the low natural frequency of the former two, they are only suitable for the measurement of low frequency signals in the construction field. The sensitivity is low, and the volume and weight after packaging are often too large, miniaturization and high sensitivity are its development direction

In addition, fiber gratings are sensitive to temperature and strain at the same time. For single-grating sensors, additional temperature compensation is required to eliminate temperature effects, which increases the difficulty of signal detection.

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