Differential absorption ranging method and apparatus

Details Differential absorption ranging method and apparatus Differential absorption ranging method and apparatus

1990-01-05

1991-07-02

Wallace, Linda J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356432, 356437, 356435, 342129, G01C 308, G01S 1308

Patent

active

050281291

ABSTRACT:
The distance between two objects, such as aircraft, helicopters and other vehicles, can be determined by transmitting from a first object through atmosphere a first frequency which is absorbed by atmosphere and a second frequency which is not absorbed by atmosphere, receiving at a second distant object the first and second frequencies, and determining from the received first and second frequencies the distance between the first and second objects. In preferred methods and apparatus, the first frequency is a frequency characteristic of atmospheric oxygen absorption (e.g., 760 nm wavelength), and the frequency transmission comprises emitting a laser light beam while modulating its frequency through a frequency range which is greater than a frequency range characteristic of atmospheric oxygen absorption (e.g., 750 nm-770 nm wavelength) and includes a second frequency which is not absorbed by atmosphere.

REFERENCES:
patent: 3103586 (1963-09-01), Ovrebo et al.
patent: 3600090 (1971-08-01), Wood et al.
patent: 4594000 (1986-06-01), Falk et al.
patent: 4830486 (1989-05-01), Goodwin
Murray, Edward R., "Remote Measurement of Gases Using Differential-Absorption Lidar", Optical Engineering, vol. 17, No. 1, Jan.-Feb. '78, pp. 30-38.

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