IOE OpenIR  > 光电技术研究所博硕士论文
Alternative TitlePulsed laser ranging system research on the interpolation method of time-to-amplitude conversion
Thesis Advisor岳永坚
Degree Grantor中国科学院光电技术研究所
Place of Conferral光电技术研究所
Degree Discipline检测技术与自动化装置
Keyword脉冲激光测距 时间间隔测量 时幅转换 数字计数 插入法
Other AbstractTraditional pulsed laser ranging with direct counting time measurement has low precision. In order to improve time resolution and precision of pulsed laser ranging, the interpolation method of time-to-amplitude conversion (TAC) is introduced in this paper. According to the time measurement principle, a pulsed laser ranging finder is designed, which is constructed of laser transmitting circuit, laser receiving circuit, time interval measurement unit and microcontroller. The laser transmitting circuit can produce laser pulse with high peak value power and short rise time, which includes semiconductor laser diode and integrated laser driver chip. In laser receiving circuit, an avalanche-photo-diode (APD) is used as detector. The signal amplifier circuit is composed of preamplifier and postamplifier. The preamplifier has low noise and broad band width of frequency. The gain of postamplifier can be adjusted by control voltage. The Constant Fraction Discriminator (CFD) is designed here. The time interval measurement unit includes Field Programable Gate Array (FPGA) digital device and analog TAC interpolation circuit. In FPGA, the functions of clock frequency multiplication, high frequency counter and sequential control logic are achieved. In analog TAC interpolation component, the time interval is converted to voltage amplitude by capacitor constant current discharging and then measured by A/D convertor. The process divides the time period and improves the time resolution. The ranging sequential control, data read and transmission and gain control with look-up-table method and D/A convertor, are achieved in microcontroller. The ranging data results are displayed on computer by serial port communication. In the end, the pulsed laser ranging finder is tested in experiment. The experiment results are ginven and the error of ranging system is analyzed. The experiment result shows that the precision of laser range finder with this method can be improved to centimeter level.
Document Type学位论文
Recommended Citation
GB/T 7714
周武林. 基于时幅转换插入法的脉冲激光测距系统研究[D]. 光电技术研究所. 中国科学院光电技术研究所,2008.
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