Optical density measurement

Details Optical density measurement Optical density measurement

1975-10-30

1978-03-07

Sacher, Paul A.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250564, G01N 2106

Patent

active

040777243

ABSTRACT:
The invention concerns a device for the measurement of organic matter in liquid samples. Modulated light is passed through the sample, and the ultraviolet and visible components of the light passing through the sample separated and caused to fall on individual photodetectors. After amplification and demodulation the outputs of the photodetectors are logarithmically amplified and subtracted to obtain the ratio between the two signals.

REFERENCES:
patent: 3413464 (1968-11-01), Kamentsky
patent: 3652850 (1972-03-01), Briggs
patent: 3783284 (1974-01-01), McCormack
patent: 3879129 (1975-04-01), Inoue
Glasser et al.; "Simple Photoelectric Process-Stream Analyzer", The Review of Scientific Instruments, vol. 33, No. 10, (Oct. 1962), pp. 1062-1066.

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