Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1994-04-20
1995-12-19
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356434, G01N 2159
Patent
active
054773288
ABSTRACT:
An optical transmission measurement apparatus has a pair of a transmitter/receiver units, beam splitters, and a reflection mirror block on both sides of an object of an atmosphere whose optical transmission factor is to be measured. Each of the transmitter/receiver units comprises a light source which can adjust the optical energy of its emitted light beam. A first beam splitter which the light beam enters after the emission, diverges the light beam into two components with different polarizations. After the divergence, during optical transmission measurement, one of the two diverged components enters the opposite photo-detector, while the other of the components returns to the photo-detector in the same unit as the light source which emitted the light beam, by being reflected thereto with the second beam splitter. On the other hand, during calibration, one of the two diverged components is reflected at the reflection mirror block to enter the photo-detector in the same unit as the light source which emitted the light beam, while the other of the components returns to the photo-detector in the same transmitter/receiver unit as that which emitted the light beam, by being reflected with the second beam splitter.
REFERENCES:
patent: 3872315 (1975-03-01), Boll
patent: 4560873 (1985-12-01), McGowan et al.
patent: 4726684 (1985-02-01), Tokumaru
patent: 5028790 (1991-07-01), McGowan et al.
OKI Electric Industry Co., Ltd.
Rabin Steven M.
Rosenberger Richard A.
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