Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1991-11-18
1993-08-24
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 28, 356 285, G01C 308
Patent
active
052393526
ABSTRACT:
A lidar with a laser transmitter for transmitting a laser beam and a receiver having receiving optics for detecting radiation reflected back from the beam by aerosol particles in the atmosphere, the receiver having an optical axis aligned with the beam. The receiver includes a number of radiation receiving elements such as concentric radiation detector elements placed in the receiving optics focal plane so that these concentric detector elements can measure backscatter radiation from the beam at several fields of view simultaneously. Backscattered signals at fields of view larger than the laser beams's divergence are due to multiple scattering. The unknown backscatter coefficient can then be eliminated by ratioing the lidar returns at the different fields of view.
REFERENCES:
patent: 4003655 (1977-01-01), Wasilko
patent: 4306500 (1981-12-01), Castanieh et al.
patent: 4634272 (1987-01-01), Endo
patent: 4927263 (1990-05-01), de Groot et al.
patent: 4979816 (1990-12-01), White
patent: 5047653 (1991-09-01), Garcia et al.
patent: 5076687 (1991-12-01), Adelson
"Stable analytical inversion for processing lidar returns" by James D. Klett, Applied Optics, 15 Jan. 1981.
"Sensitivity analysis of lidar invention algorithms" by Luc Bissonnette, Applied Optics, 1 Jul. 1986.
"Lidar inversion with variable backscatter/extinction ratios" by James D. Klett, Applied Optics, 1 Jun. 1985.
"Cloud extinction profile measurements by lidar using Klett's inversion method" by Carnuth et al, Applied Optics, 1 Sep. 1986.
"Vertical atmospheric profiles measured by lidar" by G. J. Kunz, Applied Optics, 1 Jul. 1983.
Hellner Mark
Minister of National Defence of Her Majesty's Canadian Governmen
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