Airborne air temperature radiometers

Loren D. Nelson; Carl S. Weimer; Martin J. O'Brien

doi:10.1117/12.372863

21 December 1999 Airborne air temperature radiometers

Loren D. Nelson, Carl S. Weimer, Martin J. O'Brien

Proceedings Volume 3853, Environmental Monitoring and Remediation Technologies II; (1999) https://doi.org/10.1117/12.372863
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

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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Loren D. Nelson, Carl S. Weimer, and Martin J. O'Brien "Airborne air temperature radiometers", Proc. SPIE 3853, Environmental Monitoring and Remediation Technologies II, (21 December 1999); https://doi.org/10.1117/12.372863

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KEYWORDS

Radiometry

Temperature metrology

Sensors

Carbon dioxide

Clouds

Calibration

Turbulence

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