一种被动式单波长实时测温系统的优化设计

基于Kirchhoff定律,利用一面反射镜,设计了一种可同时测量发射率及温度的单波长实时测温系统.从系统的测温灵敏度、相对测温灵敏度、探测器的温度分辨力及系统的测温标准差与波长的关系出发,并结合大气对红外辐射的透射特性,优化了系统的工作波长; 从系统的抗反射辐射能力与波长带宽的关系出发,并结合探测器的最小可探测光功率要求,优化了系统的波长带宽.实验结果表明,当λ=0.80 μm、Δλ=20 nm时,在测温范围600~2 500℃内,系统的测温不确定度优于0.3%.

Optimization of a Passive Single-wavelength Real-time Temperature Measurement System

Based on the Kirchhoff law,using a reflection mirror,a practical real-time measurement system,which can measure radiance and temperature synchronously,is optimized.According to the relations between temperature measurement sensitivity,or relative temperature measurement sensitivity,or temperature resolving power,or standard deviation of temperature and working wavelength combined with atmospheric transmittance spectra indicating windows for infrared radiation,working wavelength of the instrument is achieved.In term of the effects on temperature measurement uncertainty by reflection irradiation combined with the minimal detectable power of the detector,the wavelength bandwidth of the instrument is determined.Experimental results show that temperature measurement uncertainty exceeds 0.3% at λ=0.80 μm and Δλ=20 nm over the temperature range from 600 to 2 500℃.