Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1989-09-01
1991-10-08
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
2503361, 2504581, 2504591, 356 73, G01J 142, G01N 2164
Patent
active
050556924
ABSTRACT:
A source produces light, preferably in a wavelength band of approximately 185-200 nm and in pulses at a suitable frequency (e.g., 100 Hz). The light may be directed in a progressively diverging beam into the atmosphere for a Rayleigh scattering by molecules in the atmosphere in the 185-200 nm wavelength band and for fluorescence by particular molecules (e.g. oxygen) in the atmosphere in another wavelength band (e.g. 210-260 nm). The Rayleigh scattered light and the fluorescent light may pass in a progressively converging beam to two detectors, one responsive to the Rayleigh scattered light to produce first signals and the other responsive to the fluorescent light to produce second signals. Optical elements may prevent the second detector from responding to the fluorescent light and the second detector from responding to the scattered Rayleigh light. A data processor processes the first and second signals to provide outputs representative of the atmospheric pressure and temperature. These outputs may have a great accuracy, in part by regulating the characteristics of the light source and the first and second detectors at times between the successive light pulses from the source. The progressively diverging and progressively converging beams may have a focal point displaced externally of the housing by at least a particular distance to avoid effects of turbulence when the housing is in a moving vehicle.
REFERENCES:
patent: 4303862 (1981-12-01), Geiger
patent: 4483614 (1984-11-01), Rogers
patent: 4572667 (1986-02-01), Rogers
patent: 4652143 (1987-03-01), Wickerscheim et al.
Abbiss John B.
Azzazy Medhat
McCullough Robert W.
Smart Anthony E.
Hanig Richard
Howell Janice A.
Roston Ellsworth R.
Schwartz Charles H.
The Titan Corporation
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