论文部分内容阅读
在激光测距系统中,为了消除温度对半导体激光器调制特性及雪崩光电二极管接收性能的影响,使系统更加稳定地工作,温度控制系统的设计十分关键。通过对控温箱的合理设计,减小了周围环境对温控系统的影响;对Pt电阻测温的误差产生机理做了详细的分析,提出了脉冲供电的方案,分析了脉冲电流产生的自热效应,给出了脉冲宽度和热量积累的关系,通过合理控制脉冲宽度,减小了自热效应引起的测温误差;使用高阶正交多项式拟合的方法对Pt电阻的非线性进行了补偿,由该系统温度测量模块测量数据与一级标准铂电阻温度值的比较实验结果可知,在不同的温度点,该温度测量系统的最大误差为0.0006℃。在0~15℃的温度范围内各温度点控制稳定度均优于±0.005℃,满足了激光测距系统的需要。
In the laser ranging system, in order to eliminate the influence of temperature on the modulation characteristics of the semiconductor laser and the receiving performance of the avalanche photodiode, the system works more stably. The design of the temperature control system is very crucial. Through the reasonable design of the temperature control box, the influence of the surrounding environment on the temperature control system is reduced. The mechanism of error in the temperature measurement of the Pt resistance is analyzed in detail. The scheme of the pulse power supply is put forward. The self- Thermal effect, the relationship between pulse width and heat accumulation is given, and the temperature error caused by self-heating effect is reduced by reasonably controlling the pulse width. The non-linearity of Pt resistance is compensated by the high-order orthogonal polynomial fitting method, According to the comparison of the measured data of the system temperature measurement module with the temperature of a standard platinum resistance, the maximum error of the temperature measurement system is 0.0006 ° C at different temperature points. In the temperature range of 0 ~ 15 ℃, the control stability at each temperature point is better than ± 0.005 ℃, which meets the needs of laser ranging system.