Analog signal processing circuit for active optical micro displacement sensor

Abstract

The invention discloses an analog signal processing circuit for an active optical micro displacement sensor. The circuit comprises a power supply circuit, a differential amplification circuit, a phase-sensitive demodulation circuit and an active low pass filtering circuit; the power supply circuit supplies power to an operational amplifier in the differential amplification circuit, a multiplier inthe phase-sensitive demodulation circuit, and an operational amplifier in the active low pass filtering circuit; the differential amplification circuit receives signals of a displacement sensor and areference sensor, carries out differential amplification on the signals, and outputs amplified signals to the phase-sensitive demodulation circuit; the phase-sensitive demodulation circuit receives the signal from the differential amplification circuit as well as a driving signal from the active optical micro displacement sensor, multiplies the two signals to obtain a high-frequency signal and aDC signal, and outputs the high-frequency signal and the DC signal to the active low pass filtering circuit; and the active low pass filtering circuit filters the high frequency signal from received signals, and outputs the obtained DC signal to an analog-to-digital conversion module for conversion and further obtaining a digital signal. The analog signal processing circuit is characterized by high gain, low noise, stable signals and suitability for post control of an active optical system.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an analog signal processing circuit for an active optical micro-displacement sensor. Background technique [0002] With the advancement of science and technology, people explore space more and more frequently. Astronomical telescopes with high resolution and large field of view have become an indispensable step in space exploration. With the improvement of the resolution and range requirements of the telescope, the role played by the active optical system is becoming more and more important. According to the structure of the primary mirror, active optics can be divided into two categories: thin mirror technology and splicing technology. Simultaneous use of the two technologies requires a very thin mirror, so the sensor fixed behind the mirror is required to be light in weight and small in size, otherwise the gravitational effect of the sensor will cause deformation o...

AI Technical Summary

Problems solved by technology

Usually, the capacitive plate works under AC excitation, and the useful signal output by it is very weak. At present, the existing active optical system bit sensor processing circuit has the problems of low precision and large noise, and it is difficult to detect the tiny sensor. displacement

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