AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures

Published

May 25, 2007

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

Proceedings Title

TEMPMEKO Conference | 2007 |

Conference Dates

May 21-25, 2007

Conference Location

Chateau lake Louise, CA

Conference Title

TEMPMEKO

Pub Type

Conferences

Keywords

ambient temperatures, infrared, input optics, NEP, NETD, noise, optical radiation, radiance, radiation thermometer

Citation

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 November 5, 2025)