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2 May 2019 Improvements in the design of thermal-infrared radiation thermometers and sensors
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A new design and its characterizations for use in thermal-infrared radiation thermometer and sensors are described. This new design uses an optical configuration where critical optical elements such as the field stop, Lyot stop, collimating lens, and detector, are placed inside a thermally stabilized assembly that is controlled using thermo-electric coolers and feedback from thermistors. The optical components have been incorporated into an operational system and calibrated using both variable-temperature fluid-bath and heat-pipe blackbodies from -45°C to 75°C. The radiation thermometer has been calibrated using modified Planck function and these blackbodies. This new design has been characterized to determine noise-equivalent temperatures and long-term stability. This new design, without the need for cryogenic cooling, demonstrates sub-millikelvin temperature resolution with the possibility of weeks-long and extended-length stable operations while measuring room-temperature objects with few millikelvin stability.
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Howard W. Yoon, Vladimir B. Khromchenko, and George P. Eppeldauer "Improvements in the design of thermal-infrared radiation thermometers and sensors", Proc. SPIE 11004, Thermosense: Thermal Infrared Applications XLI, 1100408 (2 May 2019);

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