Lidar arrangement for measuring atmospheric turbidities

Details Lidar arrangement for measuring atmospheric turbidities Lidar arrangement for measuring atmospheric turbidities

1989-10-03

1993-04-27

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

180167, 356342, 356343, 356364, 356369, 36442401, 36442601, 36442604, G01C 308, G01N 2100, G06F 770, B60T 716

Patent

active

052066983

ABSTRACT:
The lidar arrangement (1) has a transmitter (3) for linearly polarized radiation (12), a receiver (5) with a first receiving device which measures intensity of the backscattered radiation (15) coinciding approximately with the transmitted radiation cone (12) in a polarization plane of the cone and in a perpendicular polarization plane, wherein the receiver further includes a second receiving device which measures the intensity of backscattered radiation (17) outside the transmitted cone (12), the outer backscattered radiation has the shape of a conical shell which surrounds the backscattered conical shell of the first mentioned backscattered radiation (15) and of the transmitted cone (12); the received separate radiation cones (15 and 17) are split in a polarization analyzing optical element into two mutually perpendicular partial light beams, each consisting of an inner partial beam portion (15a, 15b) and an outer partial beam portion (17a and 17b), the inner and outer partial beam portions are separately detected and the resulting output signals are amplified by an amplification factor which depends on the distance of the lidar from a visibility obstacle, the distance-corrected amplified signals are evaluated in a signal processing unit to distinguish between different kinds of the visibility obstacle, and the evaluated obstacle such as fog, rain, snow or solid obstacle and a distance thereof are indicated on corresponding indicators.

REFERENCES:
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patent: 3782824 (1974-01-01), Stoliar et al.
patent: 4333008 (1982-06-01), Misek
patent: 4362388 (1982-12-01), Egan et al.
Earnshaw et al., "A Feasibility Study of Identifying Weather by Laser Forward Scattering," Journal of Applied Meteorology, vol. 17, No. 10, Oct. 1978, pp. 1476-1481.
S. Jorna "Atmospheric Depolarization and Stimulated Brillouin Scattering" Dec. 1971/vol. 10, No. 12/Applied Optics, 2661-2664.
W. R. McNeil and A. I. Carswell, "Lidar Polarization Studies of the Troposphere" Sep. 1975/vol. 14, No. 9/Applied Optics, 2158-2168.
Dennis K. Kreid, "Atmospheric Visibility Measurement by a Modulated CW Lidar" Jul. 1976/vol. 15, No. 7/Applied Optics, 1823-1831.
V. E. Derr "Estimation of the Extinction Coefficient of Clouds from Multiwavelength Lidar Backscatter Measurements" Jul. 15, 1980/vol. 19, No. 14/Applied Optics 2310-2314.
E. R. Murray, M. F. Williams, and J. E. van der Laan "Single-Ended Measurement of Infrared Extinction Using Lidar" Jan. 15, 1978, vol. 17, No. 2/Applied Optics 296-299.

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