Quartz flexible accelerometer based on laser self-mixing interference

Abstract

The invention relates to the field of inertia detecting instruments. In order to provide an accelerometer having the advantages of high measuring precision, high resolution ratio, wide dynamic range, simple and compact structure, electromagnetic interference resistance and the like, the technical scheme includes that a quartz flexible accelerometer based on laser self-mixing interference comprises a meter and a digital rebalance loop, wherein the meter comprises a shell, a pendulum component, a torquer and a laser self-mixing interference signal sensor, and the digital rebalance loop comprises a laser device driving power supply, a photoelectric detection circuit, a data acquisition circuit, a digital signal processing circuit and a torque current generator. When acceleration is inputted,the laser self-mixing interference signal sensor detects displacement of the pendulum component and converts the displacement into electric signals, the electric signals are converted into current signals in proportion with the acceleration by the aid of the digital rebalance loop, the current signals are fed back to the torquer and lead the torquer to generate rebalance torque, and the acceleration can be obtained by detecting the current of the torquer. The quartz flexible accelerometer is mainly applied to acceleration measurement.

Description

technical field [0001] The invention relates to the field of inertial detection instruments, in particular to a quartz flexible accelerometer based on laser self-mixing interference. Background technique [0002] Quartz flexible accelerometer is a mechanical pendulum accelerometer, which has the advantages of high precision and sensitivity, small temperature coefficient, simple structure, small size, etc. It is one of the most ideal inertial instruments in precision inertial navigation and guidance systems. It is used in the fields of aviation, spaceflight, navigation and land navigation control. [0003] As the basic measuring element of inertial navigation and guidance system, the accuracy of quartz flexible accelerometer directly affects the performance of inertial navigation and guidance system. With the continuous development of science and technology, the precision of inertial navigation and guidance systems is constantly improving, and the requirements for the resolu...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the deficiencies of the prior art, solve the problem of low resolution and difficult improvement of precision of the quartz flexible accelerometer due to size limitation, electronic noise, mechanical thermal noise, environmental parasitic capacitance and other factors. Quartz flexible accelerometer based on laser self-mixing interference with high measurement accuracy, high resolution, wide dynamic range, simple and compact structure, and anti-electromagnetic interference

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