A signal processing system for a photodetector

Abstract

The invention discloses a signal processing system for a photoelectric detector. A current pulse signal outputted by the photoelectric detector is converted into a voltage pulse signal through a pre-amplification module; a variable gain control module is used for receiving the voltage pulse signal, extracting and amplifying; a peak holding module is used for delaying the signal peak holding time outputted by the variable gain control module; an A / D converter is used for sampling the signal outputted by the peak holding module; a processor is used for receiving the parallel port and control signals outputted by the A / D converter and resolving a target angle value; the processor is used for sending a calculating result to a central control computer through a receiver. Through comprehensive design consideration, the signal processing system for the photoelectric detector not only can be applied to a post-signal processing circuit of an APD photoelectric detector but also can be used as the post-signal processing circuit of a PIN photoelectric detector, is capable of increasing the detection precision of a servo laser target detection system and is capable of effectively controlling the research and development cost.

Description

technical field [0001] The invention belongs to the field of laser target detection and control, and specifically relates to a signal processing system of a photoelectric detector, which is suitable for post-stage signal processing circuits of photoelectric detectors such as PIN and APD in the laser target detection system. Background technique [0002] In the laser target detection system, a four-quadrant photodetector is usually used to detect the target orientation. When the target deviates, due to the change of the radiation flux between the quadrants, the photocurrent output by each quadrant changes, and the pulse signal output by the four-quadrant detector will also change accordingly. After a series of processing, the pulse signal will get the target Angle solution value. Therefore, the processing of photoelectric signals is very important, which directly affects the detection accuracy of the system. [0003] In general, the integrated photodetector with a preamplif...

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Problems solved by technology

However, since the integrated photodetector requires an internal integrated amplifier, the control interface is solidified, which is not conducive to the flexibility of the design, and the packaging cost is high, which is not conducive to the low cost of product development.

[0004] At the same time, since the responsivity of the APD photodetector is much higher than that of the PIN photodetector, and the detection distance is much longer, in the case of weak laser energy, there is a big difference in the width of the output pulse signal, so in There are also differences in the post-stage signal processing circuit

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