Optical fibre grating three-dimensional acceleration /vibration sensor

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.