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AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures
Published
Author(s)
George P. Eppeldauer, Howard W. Yoon
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
Eppeldauer, G.
and Yoon, H.
(2007),
AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures, TEMPMEKO Conference | 2007 |, Chateau lake Louise, CA
(Accessed October 5, 2024)