反射辐射和探测器本身的辐射对实时测温系统测温精度的影响及其抑制

在介绍一种采用钽酸锂热释电探测器实现的实时测温系统的基础上 ,着重讨论了反射辐射和探测器本身的辐射对该系统测温精度的影响。提出了抑制反射辐射及探测器本身的辐射对测温精度影响的 4条措施 :1)采用水冷遮蔽板并对探测器进行水冷 ;2 )尽可能地使探头正对待测物体表面 ;3)选择合适的仪器工作波长带宽 (Δλ =10nm) ;4 )进行电气补偿。进行了一些必要的分析与讨论 ,得到了采用水冷遮蔽板、将探头尽可能地正对待测面并选用合适的波长带宽可以有效地抑制反射辐射、及对探测器进行水冷并进行电气补偿 ,可有效地抑制探测器本身的辐射的结论。实验表明 ,采取优化措施后 ,在要求的测温范围 4 0 0～ 12 0 0℃内测温精度不低于 0 3% ,符合设计要求

Effect and Control on Temperature Measurement Accuracy of Real-time Temperature Measurement System by Reflection Radiation and Detector Radiation Itself

After introducing the temperature real-time measurement system using lasers InGaAs/I and pyroelectric detector LiTaO_3, this paper mainly discusses the effect and control on temperature measurement accuracy by reflection radiation and detector radiation itself. Four measures on improving temperature measurement accuracy are presented: The first is using water-cooled shelter plate and cooling the detector by water. The second is making the detector head the measurement surface as vertically as possible. The third is choosing suitable wavelength bandwidth. The fourth is making electrical compensation. Some necessary calculations and analyses are given Experimental results show that temperature measruement accuracy is suitable for requirement in the range of 400~1200 ℃ after taking these optimal measures.