Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1997-04-18
1998-07-14
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
By comparison
356436, 356442, 250575, G01N 2159
Patent
active
057813051
ABSTRACT:
A transmissometer for measuring a volume attenuation coefficient of a column of water, including a transmissometer housing; a light source, producing an optical light beam; a Y-splitter, splitting the optical light beam into two light beams within the transmissometer housing; a pressure proof connector and two optical fibers, routing the two light beams outside the transmissometer housing; two collimators for collimating outputs of the two optical fibers prior to transmission through the column of water; a reflecting prism, reflecting the outputs of the two collimators back into the transmissometer housing via a sensor view port where a distance between a first of the two collimators and the reflecting prism is R1 and a distance between a second of the two collimators and the reflecting prism is R2; two detectors for detecting intensities I1 and I2 of the two light beams reflected by the reflecting prism; and a processor for determining the volume attenuation coefficient of the column of water according to:
REFERENCES:
patent: 3146293 (1964-08-01), Lesage
patent: 3976369 (1976-08-01), McCardell et al.
patent: 3976891 (1976-08-01), Parkinson
patent: 4037973 (1977-07-01), Carr
patent: 4257708 (1981-03-01), Fukuda
patent: 4416542 (1983-11-01), Mooradian
patent: 4688943 (1987-08-01), Modarress
Rosenberger Richard A.
Sutcliff Walter G.
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