Multi-channel laser echo time measurement system based on FPGA (Field Programmable Gate Array) chip

Abstract

The invention discloses a multi-channel laser echo time measurement system based on an FPGA (Field Programmable Gate Array) chip, and relates to the field of photoelectric measurement. The system solves the problems that the existing single-point detector cannot meet requirements of multiple channels, high accuracy, wide measurement range, rapid measurement and the like. The system comprises an array detector used for converting a received laser echo signal into a weak current signal, a plurality of preamplifiers with the same quantity as array detector pixels, a plurality of threshold comparators with the same quantity as the preamplifiers, and the FPGA chip of a plurality of channels with the same quantity as the threshold comparators, wherein the preamplifiers are used for amplifying the weak current signal to a voltage signal; the threshold comparators are used for comparing the voltage signal with reference voltage, and generating a timing stop pulse signal used for marking the laser echo signal; and the FPGA chip is used for measuring a time difference between the received timing stop pulse signal and a timing start pulse signal, and obtaining the pulse flight time. The system realizes high-accuracy, wide-range and high-speed array signal measurement through multi-channel signal processing.

Description

technical field [0001] The invention relates to the technical field of photoelectric measurement, in particular to a multi-channel laser echo time measurement system based on an FPGA chip. Background technique [0002] Array laser three-dimensional imaging uses array detectors to simultaneously sample multiple points of the target, which has the advantages of high measurement data rate and fast measurement speed, and can avoid target distortion caused by scanning when single-point detectors are used, and better maintain the target structural features. At present, the signal processing technology of single-point detectors is relatively mature, and various methods such as analog method and digital method can be used to obtain high-precision target distance information. However, in the case of array detection, due to the sharp increase in the number of detector pixels, simply duplicating the signal processing process of a single-point detector will greatly increase the system ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing single-point detector cannot meet the requirements of multi-channel number, high precision,

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