Signal processing system for four-quadrant photoelectric detector

Abstract

The invention provides a signal processing system for a four-quadrant photoelectric detector, relates to the field of signal detecting and processing of photoelectric detectors, and aims at solving the problems of distortion of pulse signal acquiring, reduction of system precision and influence from environmental temperature of the exiting processing system for the four-quadrant photoelectric detector. The system is that a signal outputted by the four-quadrant photoelectric detector flows through an amplitude limiting protecting circuit and then is outputted to a high-pass filter; the filtered signal is converted into a differential signal through a single-end converting differential driver; the differential signal is adjusted by a variable gain adjusting module to be zoomed to reach a proper amplitude value and then inputted into a high speed differential analog-to-digital converter; the generated digital signal is inputted to a signal processing unit; the signal processing unit sends a control signal to a detector gain control module according to the intensity of the received digital signal; the detector gain control module controls the output gain of the four-quadrant photoelectric detector; the signal processing unit processes the signal to obtain the spot center position and then sends to a host control system. With the adoption of the system, the spot center position calculation precision can be improved.

Description

technical field [0001] The invention relates to the field of photodetector signal detection and processing, in particular to a four-quadrant photodetector signal processing system. Background technique [0002] Four-quadrant photodetectors are widely used in laser alignment, laser angle measurement and laser guidance and other fields. The four-quadrant photodetector signal processing system processes and calculates the output signal of the four-quadrant photodetector, which plays a key role in the system accuracy. [0003] At present, the four-quadrant photodetector signal processing system mainly uses the pulse signal stretching and acquisition mode with the peak detection circuit and peak hold circuit as the core. The system composition is as follows: figure 1 shown. Under the irradiation of the pulse laser of the target indicator, the four-quadrant photodetector outputs a narrow pulse electrical signal, which is pre-amplified and filtered to meet the requirements of dat...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a four-quadrant photodetector signal processing system to solve the problems of the existing four-quadrant photodetector processing system pulse signal acquisition distortion, system accuracy reduction and easy to be affected by ambient temperature problems

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