一种基于高速并行A/D转换的激光Z扫描的高频窄脉冲信号幅值测量系统的设计

Design about Amplitude Measuring System for High Frequency Short Pulse of Laser Z-Scan Based on High Speed Parallel A/D Conversion

提出了一种基于激光Z扫描的高频窄先脉冲信号幅值测量的电路设计，采用MAX964进行高速并行A／D转换．并以AT89C52单片机作为处理器，通过RS232C串行口通讯，实现对高频窄脉冲激光信号幅值测量数据实时采集。给出实验采集的多组数据，通过对实验数据的分析，说明该设计可准确测量宽度约4～5ns高频窄激光脉冲信号的幅度，测量误差约为：±3％～±5％，由此使Z扫描实验系统大大简化。

In this paper,a circuit design for the measuring of high frequency short laser pulses signal, which is based on laser Z - scan is introduced. The system can gather the measurement data of high - frequently pulse of the laser signal amplitude real- time, by the high speed parallel A/D transformation with comparators MAX964, regarding AT89C52 as the processor, and through RS 232 serial communication. In this paper, multiple sets of data gathered in the experiment are provided. By analysis of the data,it is verified that high frequency short laser pulses with the width about 4-5ns can be measured accurately by this design, the measure error is： ± 3 % - ±5%, and the experimental system of Z -scan is simplified greatly by the design.