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|Author(s):||George P. Eppeldauer; Howard W. Yoon;|
|Title:||AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures|
|Abstract:||Recent improvements in the fabrication technology of short-wave infrared (SWIR) quantum detectors opened a new era in radiation thermometry. Ambient and higher temperatures can be measured with low uncertainties using thermoelectrically (TE) cooled extended-InGaAs (E-IGA) and short-wave photovoltaic-HgCdTe (sw-MCT) detectors. These detectors, because of their low (2.5 ?m and 2.8 ?m, respectively) cut-off wavelengths, have orders of magnitude lower background noise than traditionally used broad-band infrared detectors such as cryogenically cooled, quantum detectors or thermal detectors. Because of the low detector cut-off wavelength, traditional glass-based optics can be used in the radiation thermometers. To measure low temperatures, the signal measured should be in alternating-current (AC), modulated or chopped, mode to separate it from the background-radiation-produced direct-current (DC) signal and its fluctuations. Design considerations and characteristics of a newly developed SWIR radiation thermometer are discussed. A noise-equivalent temperature difference (NETD) of < 3 mK for a 50 ?C blackbody is found. At the human body temperature of 36 ?C, the measured NETD ? 10 mK indicates that these detectors can be used in non-contact temperature measurements to replace the current thermopile or pyroelectric based radiation thermometers.|
|Proceedings:||TEMPMEKO Conference | 2007 ||
|Location:||Chateau lake Louise, CA|
|Dates:||May 21-25, 2007|
|Keywords:||ambient temperatures,infrared,input optics,NEP,NETD,noise,optical radiation,radiance,radiation thermometer|