Dr. Loren D. Nelson Profile

Dr. Loren D. Nelson

President at Ophir Corp

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Proceedings Article | 21 December 1999 Paper

Airborne air temperature radiometers

Loren Nelson, Carl Weimer, Martin O'Brien

Proceedings Volume 3853, (1999) https://doi.org/10.1117/12.372863

KEYWORDS: Radiometry, Temperature metrology, Sensors, Carbon dioxide, Clouds, Calibration, Turbulence, Black bodies, Atmospheric optics, Atmospheric sensing

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Conventional immersion aircraft thermometers suffer significant performance limitations, particularly for high- speed aircraft and at high angles-of-attack and side-slip. Moreover, immersion thermometers cannot perform through hot thick aircraft boundary layers and greatly increase the radar cross section of low observable aircraft. OPHIR Corporation has developed passive, remote-sensing thermometers which overcome these significant limitations. In addition, we have developed range-resolved radiometers to provide temperature profiles. Range resolved temperature profiles may enable Clear Air Turbulence, air density fluctuations and other flight hazards to be detected well ahead of the aircraft. A review of OPHIR's radiometer technology is presented. The fundamentals of radiant gas thermometry are introduced. Single wavelength 4.255 micrometer and 15 micrometer radiometers and range- resolved 15 micrometer radiometers are discussed as are data collected from numerous fight test programs. Finally, a laboratory demonstration of the multi-range capabilities of radiometers is discussed.

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