Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1979-06-01
1985-08-20
Arnold, Bruce Y.
Optics: measuring and testing
For light transmission or absorption
By comparison
250205, 250573, G01N 2101
Patent
active
045360910
ABSTRACT:
To reduce noise in an absorbance monitor in which the light source is a feedback controlled deuterium lamp, a mirror focuses light from a part of the central bright spot in the deuterium lamp through a small aperture in an aperture plate which blocks all other light passing through the optical detecting and electrical sensor station. The light passing through the aperture is split into two unpolarized beams within the optical detecting and electrical sensor station, one of which is transmitted through an aperture optically at least as large as the image of the aperture near the lamp and into a flow cell to sense the absorbance or transmittance of an effluent. After the sensing beam has passed through the effluent, it is electrically compared with the other beam which has been passed through an aperture to cancel out the common-mode noise and in some applications the absorbance or transmittance which may be due to the solvent or other carrier of the sample.
REFERENCES:
patent: 3422271 (1969-01-01), Fuhrmann
patent: 3777173 (1973-12-01), Landrith
patent: 4025199 (1977-05-01), Akami
patent: 4076420 (1978-02-01), De Maeyer et al.
patent: 4080075 (1978-03-01), Berg
Smith, W. J., "Modern Optical Engineering", McGraw-Hill, N.Y., 1966, pp. 20 and 21.
Arnold Bruce Y.
Carney Vincent L.
Isco, Inc.
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