A Novel Optical Fiber Vibration Acceleration Sensor with Simple Structure

Abstract

Disclosed in the invention is a novel fiber vibration acceleration sensor with a simple structure. The sensor comprises a substrate, a cantilever beam, a fixed plate, and a single-mode fiber. Fixed holes are respectively formed in positions, with identical dimensions, of the four corners of the substrate. The cantilever beam is installed on the substrate and approaches the sideline of the substrate; and on end of the cantilever beam is fixed and the other end is suspended. The middle part of the fixed plate exert pressing forces to fix one end of the cantilever beam. The single-mode fiber is fixed between the substrate and the cantilever beam in a pressed mode. When a vibration signal is applied to the cantilever beam, the cantilever beam extrudes the sensing fiber and thus slight deformation of the fiber is caused, so that a reflected optical power generated at the tail end of the fiber is modulated by the vibration signal; and a photoelectric detector detects the change of the optical power to determine the frequency and amplitude of the vibration signal. With the sensor, problems of complicated structure and high cost and poor stability due to the complicated structures of the existing fiber vibration acceleration sensor and the demodulation system thereof can be solved.

Description

technical field [0001] The invention relates to the field of vibration acceleration sensing, in particular to a novel optical fiber vibration acceleration sensor with simple structure. Background technique [0002] Compared with traditional vibration acceleration sensors based on piezoelectric structures, vibration acceleration sensors based on optical fiber structures have the characteristics of anti-electromagnetic interference, high sensitivity, and easy reuse, and have been widely used in civil engineering, aerospace, petrochemical and other fields. . Measuring vibration acceleration is a commonly used method for vibration monitoring. According to different sensing principles, currently widely studied fiber optic vibration acceleration sensors can be divided into wavelength modulation type, phase modulation type, polarization modulation type, and intensity modulation type. Wavelength modulation sensors use fiber gratings as sensitive devices, phase modulation sensors us...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of optical fiber vibration acceleration sensor that is used for measuring mechanical vibration acceleration, realize the measurement of mechanical vibration acceleration by measuring the change of the optical power reflected by the end of the optical fiber, solve the existing vibration sensor and demodulation system complex structure, expensive High, easily affected by temperature and other issues

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