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 6 73K～14 73K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 6 73K～ 14 73K内 ,其测温不确定度不低于 0 .3%。
Based on the Kirchhoff law,a practical temperature re al-time measurement system using laser diode InGaAs/I and LiTaO 3 pyroelectric detector is presented.By means of analyzing the relationships among resolving p ower of A/D converter,temperature measurement sensitivity of V(T)-T curve and temperature measurement range,16bite A/D converter for this instrument is d etermined.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 re solving 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 me a surement sensitivity is above 0.5K at lower temperatures and above 0.1K at highe r temperatures at 673K～1473K after using optimal parameters.Temperature measure ment inaccuracy at 673K～1473K exceeds 0.3%.
出处
《激光技术》
CAS
CSCD
北大核心
2004年第6期625-629,共5页
Laser Technology
基金
河南省科技攻关计划资助项目 (0 0 112 0 32 1)
