基于高速脉冲调制和回波采样技术,构建了一套激光测距系统。该系统利用高灵敏度多像素光子计数器的多回波光子信号累加输出的特性实现光电信号转换,借助高速信号采集技术对回波信号进行全波形采集,通过回波波形的累加计算得到了回波信号的精确到达时刻,最终获得了高精度的距离信息。理论分析和实验验证的结果表明,该测距系统在实现远距离目标探测的同时,能够兼顾近距离目标的高精度测距,系统的测距动态范围可达10 ⁷,测距精度为0.6 mm。

A laser ranging system based on high-speed pulse modulation and echo sampling technology is developed. Using the high-sensitivity multi-pixel photon counter with the characteristic of multi-echo photon signal accumulative output, the photoelectric signal conversion is realized. By means of the high-speed signal acquisition, the full waveforms of the echo signals are obtained. In addition, the precise arriving time of the echo signal is achieved through the accumulation of the echo signal waveforms. Finally, the high-accuracy laser ranging is realized. The results of the theoretical analysis and the experiments show that the designed laser ranging system can realize long range target detection as well as short range laser ranging with high precision. Meanwhile, the dynamic range is up to 10 7 and the ranging accuracy reaches 0.6 mm.