Rear-looking apparatus and method for detecting contrails

Details Rear-looking apparatus and method for detecting contrails Rear-looking apparatus and method for detecting contrails

1992-07-28

1994-02-08

Johnston, Jill A.

Optics: measuring and testing

By particle light scattering

With photocell detection

340945, 356 4, 356 5, G01C 300

Patent

active

052852563

ABSTRACT:
Contrail detection aft of an aircraft is provided by a rear-looking ranging system carried by the aircraft. A randomly modulated laser beam is directed into a detection volume aft of the aircraft for scatter back toward a detector on the aircraft. Bistatic mounting of a laser and a telescope of the detector preclude sensing of the scattered beam forward of the detection volume. Processing of the detected scattered beam includes cross correlation and analysis to indicate the formation of the contrail aft of the aircraft.

REFERENCES:
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patent: 4965573 (1990-10-01), Gallagher et al.
patent: 5206698 (1993-04-01), Werner et al.
Knollenberg, R. G. "Measurements of the Growth of the Ice Budget in a Persisting Co trail", Journal of the Atmospheric Sciences, vol. 29, Oct. 1972, pp. 1367-1374.
Takeuchi, N., et al., "Random Modulation CW Lidar," Applied Optic, vol. 22, May 1, 1983, pp. 1382-1386.
Takeuchi, Nobuo, et al., "Diode-laser Random-modulation CW Lidar," Applied Optics, vol. 25, Jan. 1, 1986, pp. 63-67.
Nagasawa, Chikao, et al., "Random Modulation CW Rador Using New Random Sequence," Applied Optics, vol. 29, Apr. 1, 1990, pp. 1466-1470.

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