热敏液晶测温标定及误差分析

对SPN／R30C20W型热敏液晶的特性进行了实验研究。实验以相机视角、光源强度、液晶厚度等参数作为对象，讨论了3种参数对液晶测温结果的影响。分析结果表明：在视角小于15°时，相机视角对液晶测温的影响可以忽略；光强不同导致由标定曲线计算出的最大温差达到5．5℃；液晶厚度对标定数据有较大的影响。该实验结论在液晶测温领域广泛应用。

Calibration and Error Analysis of Temperature Measurement for Thermal Sensitive Liquid Crystal

The experimental investigation of characteristics of the thermal sensitive liquid crystal whose type is SPN/R30C20W was performed. The camera angle, light source intensity and liquid crystal thickness were regarded as parameters in the experiment and the effects of the three paran~eters on the liquid crystal temperature measurement were discussed. The analysis results show that： the effect of camera angle on the liquid crystal temperature measurement can be neglected when the angle is smaller than 15°; the maximal temperature difference calculated by the calibration curve can be as much as 5.5℃ due to the variety of light intensity; the liquid crystal thickness has remarkable influence on the calibration data, The experimental conclusions can be widely used in the field of liquid crystal temperature measurement.