红外测距仪电路延时模拟检测研究

对红外测距仪进行性能检测时，需要高精度稳定可调的模拟距离测试值。光纤作为一种理想的距离模拟器件具有稳定性好、精度高等特点，但随着模拟距离的增加其存在体积质量大、便携性和灵活性差等缺点。为弥补光纤延时模拟检测方法的不足，研究了基于电路延时的模拟距离产生方法，设计了模拟回波生成电路和高精度模拟回波延时控制电路，分析了系统的固有延时及误差。采用高精度时间-数字转换器件对模拟检测电路进行了验证，模拟距离控制精度可达0.5 m，形成了对光纤延时模拟检测方法的有力补充。

Circuit-delay simulated testing for infrared range finders

The simulated distance data with high precision, good stability and adjustability are needed in the performance testing of an infrared range finder. The optical fiber as an ideal distance-simulating component is of many excellent characteristics such as high accuracy and good stability, but with the increase of the simulated distance, it shows some shortcomings, i.e. large physical dimension, weak portability and flexibility. To make up for the lack of fiber-delay simulated testing method, the distance- simulating technique based on circuit-delay was studied. The simulated echo producing circuit and simulated echo high precision delay time control circuit corresponding to the method were designed. The inherent delay and error of the system were analyzed. The verification of the simulated test circuits was implemented by Time-to-Digital-Converter circuit and the simulated distance control precision can achieve 0.5 m. It supplements the simulated testing technique for infrared range finders by fiber-delay.