摘要
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 rangefinder system, the temperature control system is a critical issue which can avoid the thermal fluctuating to affect the modulation characteristic of the laser diode and the receptivity of the avalanche photodiode. A proper structure of temperature control system was designed to reduce the environment impact on temperature controlling. The main error sources of using Platinum resistor in temperature measurement were analyzed in detail, and a new set of circuit based on pulse current drive was proposed. The self-heat effect of the pulse current drive was studied and the relationship between pulse width and heat quantity accumulation was given. The thermometric error from self-heating effect was decreased greatly by controlling the pulse width properly. The platinum resistor nonlinear was compensated with higher order orthogonal polynomial fitting method. The high precision compensation was proven by comparing data of the temperature measuring module and of the absolute standard Platinum resistance thermometer. The absolute value of maximum error is 0.000 6 ℃ at different temperature spots from 0 ℃ to 15 ℃. The temperature stability is about ±0.005 ℃ in the controlled temperature range and meets the need for accuracy in rangefinder system.
出处
《红外与激光工程》
EI
CSCD
北大核心
2008年第6期1016-1020,1028,共6页
Infrared and Laser Engineering
基金
黑龙江省质检总局青年科技基金项目(Q01-07)
关键词
温度控制
脉冲供电
自热效应
激光测距
Temperature control
Pulse drive current
Self-heated effect
Laser range finder
