激光测距仪的脉冲电流供电温度控制系统  

Temperature control system supplied by pulse-drive current for laser range finder

作　　者：贾方秀[1] 丁振良[1] 

机构地区：[1]哈尔滨工业大学自动化测试与控制学院,黑龙江哈尔滨150001

出　　处：《光学精密工程》2009年第9期2128-2135,共8页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.50275040)

摘　　要：激光测距系统中的发射器件和接收器件具有温敏特性且均为小功率器件，精密测温电路采用Pt电阻时，Pt电阻的自热效应影响测温精度。为减小自热效应产生的测温误差，在分析Pt电阻测温误差产生机理的基础上，提出了一种新的脉冲电流供电方案，建立了脉冲电流供电电路及其自热升温过程的数学模型，给出了脉冲宽度和热量积累的关系，并通过合理控制脉冲宽度大大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法对Pt电阻的非线性进行了补偿，给出了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，在不同的温度点，该温度测量系统的最大误差为0．0006℃。系统稳定性测试结果表明，该系统在0～15℃时，各温度点控制稳定度均优于0．005℃，满足高精度激光测距的需要。The light emitting and light receiving devices in laser range finders are low-power components characterized by temperature sensitivity. When a Pt resistance is set in a circuit for temperature measurements,the self-heating effect of Pt resistance influences the resolution of the temperature control system. In order to decrease the error caused by the self-heating effect, a new set of circuit is proposed based on a pulse-current drive. The models of pulse-current drive circuit and the equivalent heat loop of self-heating effect are set up. Then, the relationship between pulse width and heat quantity accumulation is given and the measuring error from the self-heating effect is decreased sharply by controlling the pulse width properly. Finally,a high-order orthogonal polynomial method is used to compensate the Pt resistor nonlinearity and the high precision of compensation is proved by comparison tests of the temperature measuring module and the absolute standard Pt resistance thermometer. The experimental results show the absolute value of maximum error is less than 0. 000 6℃ at different temperatures and the stability of temperatures in 0-15 ℃ is better than 0. 005 ℃. These results meet the needs of high-accuracy laser range finders.

关 键 词：激光测距仪 温度控制 脉冲供电 自热效应 

分 类 号：TN247[电子电信—物理电子学] TH821[机械工程—仪器科学与技术]