Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1993-06-07
1995-08-22
Rosenberger, Richard A.
Optics: measuring and testing
By particle light scattering
With photocell detection
250573, 250574, 356 73, 356438, G01N 2100
Patent
active
054445302
ABSTRACT:
A weather identification system is provided which employs a first photosensitive receiver positioned directly in the path of a beam of light a predetermined distance from a partially coherent light beam source. The first photosensitive receiver is in direct optical communication with the light beam source to produce electronic signals in response to scintillations caused by particle movement between the source and the first receiver. Signals from the detected scintillations are filtered to provide an output having a frequency range above one kilohertz indicative of rain intensity, and a second output having a frequency range lower than two hundred fifty hertz indicative of snow intensity. A second photosensitive receiver is positioned out of the path of the beam of light and is oriented at an oblique angle relative thereto to provide an output indicative of forward scattering of light from scintillations that occur in the beam of light. The signals from the second photosensitive receiver provide an output having a signal strength characteristic of visibility. The weather identification system thereby senses precipitation, categorizes the precipitation as either rain or snow, and measures visibility. The weather condition indicating system is ideal for use in remotely monitoring airfields.
REFERENCES:
patent: 4240752 (1980-12-01), Tausch et al.
patent: 4760272 (1988-07-01), Wang
Point Visibility Meter: A forward scatter instrument for the measurement of aerosol extinction coefficient by J. V. Winstanley and M. J. Adams.
An Optical Rain Gauge Based on Forward Scattering by L. G. Kazovsky, Senior member, IEEE.
Journal of Applied Meterology vol. 17: A Feasibility Study of Identifying Weather By Laser Forward Scattering by K. B. Earnshaw et al.
Journal of Applied Meteorology vol. 21 No. 11, Nov. 1982; Laser Weather Identifier: Present and Future by Ting-I Wang et al.
HHS, Inc. HHS-TD-083 Jun. 1982 VR-301 Visibility Meter, Technical Data Sheets.
Kim Robert
Rosenberger Richard A.
Scientific Technology Inc.
Thomas Charles H.
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