Integrated two-dimensional fiber optic micro accelerometer based on four-core fiber optic

Abstract

The invention provides an integrated two-dimensional fiber optic micro accelerometer based on a four-core fiber optic, which is formed by connecting light sources the wave lengths of which are 1310nm and 1550nm respectively, a wavelength division multiplexer, a circulator, a single-core fiber optic, a fiber optic sensing probe and a dual detector, wherein the fiber optic sensing probe comprises a four-core fiber optic, an external shell, mass blocks and a support, wherein each fiber core is carved with fiber optic gratings serving as reflectors; resonance wavelengths of the two orthotropic fiber optic grating pairs are 1310nm and 1550nm respectively; the single-core fiber optic and the four-core fiber optic are connected by utilizing a fiber optic coupler; the single-core fiber optic and the shell are rigidly connected; the mass blocks and the four-core fiber optic are connected and fixed; the mass blocks are fixed at the positions of the four fiber optic gratings; and the four-core fiber optic is fixed with the external shell by the support. The invention is beneficial to the miniaturization and the integration of sensors, can realize the acceleration measurement in the two-dimensional direction, has simple, convenient and feasible manufacture method and can achieve the goal of temperature compensation.

Description

technical field [0001] The invention relates to an optical fiber accelerometer, in particular to an integrated two-dimensional optical fiber micro-accelerometer based on a four-core optical fiber. Background technique [0002] Accelerometer is an important sensor commonly used in anti-shock, anti-vibration measurement, earthquake detection, inertial navigation and guidance systems of ordnance, vehicles, ships, etc. The basic principle is: set a mass block in the inertial space to sense the measured object as acceleration The inertial force or displacement generated during movement, and the corresponding acceleration can be measured by measuring the inertial force or displacement. Traditional accelerometers use electromechanical methods to measure the inertial force or displacement of the mass, while fiber optic accelerometers use optical fiber sensing technology to measure the inertial force or displacement of the mass. Compared with the former, the latter not only has the ...

AI Technical Summary

Problems solved by technology

The Chinese patent "Fiber Bragg Grating Three-dimensional Acceleration Vibration Sensor" (publication number CN 101210937A) and US Patent US 20060219009A1 use three gratings to realize three-dimensional acceleration measurement. The probe structure designed by this method is too complicated, which is not conducive to practical use

However, the change of the spectrum occupies a wide channel, and generally requires a spectrometer to demodulate, so the cost of the sensor head and demodulation is very high

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