一种可同时测量发射率及温度的被动式测温系统

A Passive Temperature Measuring System for Radiance and Temperature Measurement in the Meantime

介绍了一种实用化实时测温系统.该系统采用了PIN硅光电二极管作光接收器件,由光学接收系统、信号放大与处理系统及显示系统三部分组成.从系统的相对测温灵敏度及探测器的温度分辨率与波长间的关系出发,结合大气对红外辐射的透射特性,确定了系统的工作波长;从系统的抗反射辐射能力出发,并结合探测器的最小可探测光功率要求,确定了系统的波长带宽.从辐射能P1、P2的测量不确定度出发,讨论了待测目标的发射率及温度的测量精度.结果表明,当λ=0.80 μm、△λ=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%,满足设计要求.

A practical temperature real-time measuring system using PIN photodiode as a pyroelectric detector is proposed. The instrument consists of three parts： optical receiving system, signal amplifying and controlling system and display system. In terms of the atmospheric transmittance spectra for radiation and the relationship among the relative temperature measurement sensitivity, the temperature resolving power and the working wavelength, the working wavelength of this instrument is determined. According to the effects on temperature measuring uncertainty by working wavelength bandwidths of the instrument, the bandwidth of the working wavelength is achieved. The inaccuracy of temperature measurement and the radiance is briefly analyzed on the basis of the uncertainty of P1 and P2. Experimental results show that temperature measuring accuracy is less than 0.3% at ,λ=0.80 μm and △λ=20 nm over the range from 600 ℃ to 2 500℃ .