Temperature measurement sensitivity of a practical real-time temperature measurement system
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摘要: 基于基尔霍夫定律,利用半导体激光器InGaAs/I及钽酸锂热释电探测器设计了一种实用化的实时测温系统。基于该系统A/D转换器件的分辨率、V(T)-T曲线的温度灵敏度及其与测温范围间的制约关系,确定了系统应选用16位的芯片为其A/D转换器件;基于该系统的测温精度、V(T)-T曲线的相对温度灵敏度及其与波长间的关系,对其工作波长的优化选择进行了进一步的讨论;基于探头的温度分辨力、A/D转换器件的分辨率以及与V(T)-T曲线的温度灵敏度间的制约关系,对其波长带宽的优化设计进行了进一步的分析,并给出了系统在673K～1473K内的测温灵敏度。对系统进行优化设计后,在测温范围的低温段,其灵敏度不低于0.5K;在测温范围的高温段,则不低于0.1K。在673K～1473K内,其测温不确定度不低于0.3%。Abstract: Based on the Kirchhoff law,a practical temperature real-time measurement system using laser diode InGaAs/I and LiTaO3 pyroelectric detector is presented.By means of analyzing the relationships among resolving power of A/D converter,temperature measurement sensitivity of V(T)-T curve and temperature measurement range,16bite A/D converter for this instrument is determined.According to the relationships among temperature measurement accuracy,relative temperature measurement sensitivity of V(T)-T curve and waveleng ths,further optimal wavelength is discussed.Based on the relationships among resolving power of the detector and A/D converter and temperature sensitivity of V(T)-T curve,further optimal wavelength bandwidth is analyzed.Temperature measurement sensitivity of the instrument at 673K～1473K is given.Temperature measurement sensitivity is above 0.5K at lower temperatures and above 0.1K at higher temperatures at 673K～1473K after using optimal parameters.Temperature measurement inaccuracy at 673K～1473K exceeds 0.3%.
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