Optical fibre grating three-dimensional acceleration /vibration sensor

Abstract

A 3D acceleration / vibration sensor for fiber grating comprises three measurement probes respectively fixedly arranged on a right plane, an upper plane and a front plane of a pedestal vertical to each other and corresponding to x, y and z axes to form a mutually vertical position relationship, wherein each measurement probe is connected with an optical splitter through a single-mode fiber at one end, and the other end of the optical splitter is respectively connected with a light source and wavelength demodulation equipment through a single-mold fiber. The measurement probe comprises a bending beam fixed on the pedestal plane, fiber gratings adhered on the surface of the bending beam along the axial direction of the bending beam and a mass block fixed on the free end of the bending beam, wherein one ends of the fiber gratings are connected with the optical splitter through a single-mold fiber. The invention adopts a fiber Bragg grating as the sensor, and adopts three fiber gratings for measuring three mutually vertical components of a spatial 3D acceleration, thus achieving measurement of the spatial 3D acceleration by vector superposition of the three components. The sensor can be used for sensing spatial 3D acceleration or vibration parameters.

Description

technical field [0001] The invention relates to a sensor. In particular, it relates to a fiber grating three-dimensional acceleration / vibration sensor which realizes the measurement of space three-dimensional acceleration through vector superposition of three components. Background technique [0002] Fiber Bragg Grating is a new type of photonic device, which is a spatially periodic refractive index distribution established in the optical fiber, which can change and control the propagation behavior of light in the optical fiber. When Bragg gratings are written on single-mode fiber, due to the uniform refractive index distribution, the reflection spectrum has a reflection peak that satisfies the Bragg condition, and the wavelength of the reflection peak is proportional to the grating spacing and the depth of refractive index modulation. When the fiber grating is subjected to an axial force, its grating period will change, which will cause the shift of the reflection peak of ...

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Problems solved by technology

[0003] However, in the prior art, fiber gratings can only be used for one-dimensional acceleration sensing, and there is no solution for using fiber gratings to realize spatial three-dimensional acceleration sensing

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