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A new surface temperature measurement using infrared detector Qingsheng Xie,Wei Liu,Hanbing Leng,Bo Yi,Zefeng Wang,Yaohong Chen Xi'an Institute of Optics and Precision Mechanical of Chinese Academy of Sciences,Xi'an 710119,P.R.China Abstract:This paper describe a research theoretically of the conversion result to the target surface temperature based on long wave infrared detector,proposed a temperature measurement,then validate it by experiments.First,it introduces the constitution and measurement principle of the medical infrared thermal imager.The medical infrared thermal imager include lens,infrared detect,temperature sensor,A/D converter and signal processor.We use black body as target,which can hold a stable temperature.The medical infrared thermal imager is placed in a constant temperature cabinet,convert infrared of target to gray image and send gray image to PC to save.Meanwhile,the temperature of the infrared thermal imager is else send to PC.Second,it describe the gray drift characteristic of infrared detect,analyze the experimental data under different environment,summarize the gray drift model and propose a gray drift compensation method.Some experiments was accomplish,collect the gray out of infrared imager to black body with different temperature under several environment temperature.In these experiments,we also collect the gray out of shuttle and its temperature.From these experiments,we can summarize the gray drift model.The gray out of infrared detect fluctuates with time and surrounding temperature,even if the target black body have unique temperature,while the difference of black body gray and shuttle gray decrease the influence of environment temperature in a great degree.This paper proposes a temperature measurement which use target gray,shuttle gray and surrounding temperature.It also proposes a gray drift compensate formula,which calculate target temperature,minimize the influence by environment temperature.Finally,some temperature measure experiment was carry out.We modify the temperature measurement in infrared thermal imager by using the compensate formula,then send temperature image to PC and calculate the target temperature.The results show the temperature error after compensation is under 0.5℃,confirm the validity of the temperature measurement.