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Performance evaluation of fast, high precision laser rangefinder electronics with a pulsed laser

机译：带有脉冲激光器的快速，高精度激光测距仪电子设备的性能评估

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A laser rangefinder system based on a pulsed time of flight distance measurement technique was constructed and tested. The system is composed of a receiver channel connected to a leading edge timing discriminator and a time interval measurement electronics. The receiver channel consists of a wide bandwidth IriGaAs photodiode with a typical rise time of 35 ps. A timing discriminator has 8 GHz equivalent input rise time bandwidth and a programmable threshold. It is capable of processing electrical pulses as short as 80 ps and is constructed using commercially available components. The time interval measurement electronics is highly programmable system. The measurement method is based on an interpolation principle where the time interval is roughly digitized by a coarse counter driven by a high stability reference clocks and the fractions between the clock periods are measured by two time-to-digital converter chips. The system has two reference clock inputs and two independent channels for measuring start and stop events. Only one 40 MHz reference is required for the measurement. The system can achieve a timing resolution better than 15 ps rms with up to 90 kHz repetition rate. The measurement range is from 0 ps up to 1 second. The performance of the system was evaluated at short distances with a pulsed laboratory constructed laser. It is a mode-locked NdrYAG laser generating 20 ps output pulses at the wavelength of 1064 nm with a repetition rate up to 100 Hz. The system is capable of measuring distances down to 0 m. The overall measurement accuracy is estimated to be 5 mm and will be verified by the experiment.
机译：构造并测试了基于脉冲飞行时间测距技术的激光测距仪系统。该系统由一个连接到前沿定时鉴别器的接收器通道和一个时间间隔测量电子设备组成。接收器通道由一个宽带IriGaAs光电二极管组成，典型上升时间为35 ps。定时鉴别器具有8 GHz等效输入上升时间带宽和可编程阈值。它能够处理短至80 ps的电脉冲，并使用市售组件构建。时间间隔测量电子设备是高度可编程的系统。测量方法基于插值原理，其中时间间隔通过由高稳定性参考时钟驱动的粗略计数器粗略地数字化，时钟周期之间的分数由两个时间数字转换器芯片测量。该系统具有两个参考时钟输入和两个独立的通道，用于测量启动和停止事件。测量仅需要一个40 MHz参考。该系统可以以高达90 kHz的重复频率实现优于15 ps rms的定时分辨率。测量范围为0 ps至1秒。该系统的性能是在短距离内用脉冲实验室构造的激光器进行评估的。它是一种锁模NdrYAG激光器，在1064 nm波长处产生20 ps的输出脉冲，重复频率高达100 Hz。该系统能够测量低至0 m的距离。总体测量精度估计为5毫米，并将通过实验进行验证。

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