数字温度传感器在测色系统中的应用  

Application of Digital Temperature Sensor in Color Measurement System

作　　者：李婷[1] 谷玉海[1] 徐小力[1] 

机构地区：[1]北京信息科技大学机电系统测控北京市重点实验室,北京100192

出　　处：《现代电子技术》2009年第2期183-185,188,共4页Modern Electronics Technique

基　　金：机电系统测控北京市重点实验室开放课题资助项目(KF20061123207)

摘　　要：光电积分式测色系统中一般使用硅光电池作为光电探测器,硅光电池的温度漂移特性会影响测量的稳定性。为达到更好的性能指标,需要对测色系统进行适当的电压补偿。通常采用分时间段对电压值进行线性补偿,实际上待测电压值并不是严格按照时间线性变化的,而是按照温度线性变化的。使用数字温度传感器DS18B20跟踪实时温度,分析温度与待测电压值的线性关系,获取温度补偿系数,通过软件对测色系统进行电压补偿。当引入温度传感器后,测色系统的测色色差ΔE均小于0.15,完全达到了国家计量院规定的要求,实验结果表明该方法在测色系统的实际应用中是切实可行的。The color measurement system takes silicon photocell as its photo detectors, the temperature characteristic of silicon photocell would produce influences to the measuring stability of system, and proper voltage compensating is needed to make the performance indicators more excellently. Usually,voltage can be linearity compensated base to hours, but actually the changes of the voltage value in accordance with temperature rather than hours. Digital temperature sensor DS18B20 is designed for tracking the current temperature,analyzing the linearity relation between temperature and voltage value. After achieving the coefficient of voltage compensating, voltage would be compensated by software editor. Basing on stipulations that instituted by National Institute of Metrology, the value of chromatic aberration is less than 0.15, which has already up to scratch by using DS18B20,the results indicate that this method is feasible and actuality for practical applications in the color measurement system.

关 键 词：DS18B20 测色系统 温度漂移 电压补偿 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置]