Hollow sapphire waveguides for remote radiometric temperature measurements

Abstract
Hollow sapphire waveguides have been successfully employed for remote radiometric temperature measurements over an extended temperature range (30°C to 1650°Q. These waveguides not only exhibit an infrared transmission window from 10 to 17μm, which permits low temperature blackbody detection, but the sapphire also possesses an intrinsic melting point of 2053°C, enabling their operation in high temperature environments.

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