环境辐射对实时测温仪测温精度的影响及抑制

Effect and control on temperature measurement accuracy of the real-time measurement instrument by surrounding radiation

在简要介绍一种利用半导体发光器件作辅助测量光源、以InGaAs光电二极管作光电转换器件实现的实时测温仪(工作波长1.5μm、波长带宽20nm、测温范围400℃至1100℃)的基础上,着重讨论了环境辐射体的辐射对其测温精度的影响,提出了抑制环境辐射体的辐射对仪器测温精度影响的三条措施:一是采用遮蔽板和孔径光阑;二是尽可能地使探测器正对待测面;三是进行电气补偿。进行了一些必要的分析与讨论,得到了采用遮蔽板和孔径光阑、尽可能地使探测器正对待测面和进行电气补偿可有效抑制环境辐射体的辐射对仪器测温精度的影响的结论。实验表明,采取这些措施后在仪器的测温范围内,其测温精度不低于0.2%、符合设计要求。

After briefly introducing the structure and principle of the real-time temperature measurement instrument,this paper mainly discusses the effect on the temperature measurement accuracy by surrounding radiation.The working wavelength,bandwidth and measurement range of this instrument are of 1.5μm,20nm and 400-1100℃,respectively.It uses a laser diode as the light source and uses an InGaAs photodiode as the detector.Three measures on improving its measurement accuracy are presented:the first is using a shelter...