Method and apparatus for detecting clear air turbulences

G - Physics – 01 – W

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354/15, 343/70

G01W 1/00 (2006.01) G01J 5/60 (2006.01)

Patent

CA 1148636

ABSTRACT OF THE DISCLOSURE An improved clear air tubulence (CAT) detector sensing infrared radiation in the 27-33 micrometer range of the water vapor rotational wavelength band. The improved clear air tubulence detector for use on an air- craft includes a forward looking and upwardly oriented between 8° to 12° optical assembly having a thallium bromoiodide infrared lens, a 27-33 micrometer wavelength interference filter and an infrared detector; a radio- meter amplifier for amplifying the output of the optical assembly and for generating an analog voltage signal related to the received infrared intensity, a processing unit for analyzing the analog signal, and a display unit for generating a first signal when no clear air turbulence is detected, a second signal when a moderate turbulence is detected, and a third signal when extreme turbulence is detected. A method for determining the advance time for entering the clear air turbulence after detection is based upon the altitude of the aircraft.

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