单波长测温仪低温段的测温精度与波长带宽的优化选择  

Investigation of temperature measurement accuracy at low-temperature measurement range and the optimization of wavelength bandwidth

作　　者：施德恒[1,2] 刘玉芳[2] 余本海[1] 

机构地区：[1]信阳师范学院物理电子工程学院,河南信阳464000 [2]河南师范大学物理与信息工程学院,河南新乡453007

出　　处：《激光杂志》2009年第1期58-60,共3页Laser Journal

基　　金：国家自然科学基金(编号:60777012和60577050);河南省高校科技创新人才支持计划(编号:2008HASTIT008);河南省科技厅基础研究项目(编号:082300410050)资助的课题

摘　　要：基于Kirchoff定律,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设计了一种能够同时准确测量待测面的发射率和温度的仪器(工作波长1.5μm、测温范围400℃至1100℃)。在简要介绍这一仪器基本测量原理的基础上,着重讨论了在不同的波长带宽下环境辐射体的辐射对其测温精度、尤其是对测温范围内低温区的测温精度的影响。理论分析表明:波长带宽太窄时仪器的温度分辨力太低、从而其测温精度也很低;波长带宽太宽时环境辐射体的辐射对仪器的测温精度影响大、从而导致其测温精度也不高,因此仪器的波长带宽应适中选择。综合考虑各种因素,仪器选择Δλ=20nm作为其工作波长的带宽。采用优化设计的这一波长带宽后,在其测温范围内、尤其是在测温范围内的低温区,其测温精度不低于0.2%,符合设计要求。Based on the Kirctthoff law, a practical real - time specific radiance and temperature measurement instrument has been developed. This instrument uses an InGaAs photodiode as the detector and uses a laser diode as the light source, its working wavelength and temperature measurement range are of 1. 5 μm and 400 - 1100℃, respectively. According to the relations between the temperature measurement accuracy and the main technical parameters of this instrument, the effect on the temperature measurement accuracy by smTounding radiation at the different wavelength bandwidths is discussed in detail. Theoretical results demonstrate that the temperature measurement accuracy is much poor when the wavelength bandwidth is too narrow due to the deteetor sensitivity, and the aecuraey is also low when the wavelength bandwidth is too wide due to the surrounding radiation. Taking into account these factors, this instrument chooses △λ = 20 nm as its wavelength bandwidth. Experimental results show that the temperature measurement accuracy is superior to 0.2 % after choosing this wavelength bandwidth, especially at low- temperature measurement range at 400- 1100℃. It is in accortance with the instrument requirements.

关 键 词：实时测温 发射率 环境辐射 测温不确定度 辐射测温 

分 类 号：TN248.1[电子电信—物理电子学]