中国激光, 2015, 42 (8): 0814001, 网络出版: 2022-09-24   

模拟与光子计数融合的激光雷达信号采集系统设计

Signal Acquisition System with Simultaneous Analog and Photon Counting Measurement for Lidar
作者单位
1 中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室, 安徽 合肥 230031
2 中国科学院大学, 北京 100049
摘要
为了扩展激光雷达的测量动态范围,设计了一种基于模拟与光子计数融合方法的信号采集系统。采用多级放大技术设计了用于模拟与光子计数融合方法的双通道前置放大器,并与通用数据采集卡和光子计数卡组成信号采集系统。利用激光雷达信号模拟源搭建了测试系统;通过测量坪特性和脉冲高度分布确定光电倍增管(PMT)的工作高压和鉴别电平;测试了模拟通道和光子计数通道的性能以及两个通道的可拼接性。实验结果表明,设计的信号采集系统性能优于LICEL 公司的瞬态记录仪TR20-160;两个通道的信号具有较好的拼接性,通过两个信号的拼接提高了激光雷达信号采集系统的动态范围。
Abstract
In order to extend the dynamic range of the Lidar measurement, a signal acquisition system based on simultaneous analog and photon counting fusion method is designed. The signal acquisition system is comprised of the universal data acquisition card and universal photon counter card, a dual-channel preamplifier which is designed for the simultaneous analog and photon counting measurement by using the technique of multistage amplification. A testing system is configured with a Lidar signal simulation device. According to the plateaus characteristics of the photomultiplier tube (PMT) and the differential pulse height distributions measured by the testing system, the supply voltage of the PMT and the discriminator level are selected. The performance of the analog channel and photon counting channel of the signal acquisition system and the practicability of gluing two channels are tested. Experimental results show that the designed signal acquisition system has better performance than TR20-160, the Lidar transient recorder from LICEL. The signals from two channels are suitable for being glued together, and the dynamic range of the Lidar signal acquisition system is extended by the gluing.

付毅宾, 王煜, 张天舒, 范广强, 刘文清, 常振, 邱晓晗, 方玲丽, 田禹泽. 模拟与光子计数融合的激光雷达信号采集系统设计[J]. 中国激光, 2015, 42(8): 0814001. Fu Yibin, Wang Yu, Zhang Tianshu, Fan Guangqiang, Liu Wenqing, Chang Zhen, Qiu Xiaohan, Fang Lingli, Tian Yuze. Signal Acquisition System with Simultaneous Analog and Photon Counting Measurement for Lidar[J]. Chinese Journal of Lasers, 2015, 42(8): 0814001.

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