Optics: measuring and testing – By shade or color – With sequential comparison of sample and standard
Patent
1989-09-27
1991-05-07
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
With sequential comparison of sample and standard
250228, 356414, 356434, 356440, 356236, G01N 2131, G01N 2151
Patent
active
050131559
ABSTRACT:
A portable hand held instrument is capable of making accurate colorimetric measurements in the field. The instrument has a body which houses the electronic circuitry and a door which allows a vial having a solution to be measured to be placed therein. The vial is illuminated lengthwise by a light beam of two wavelengths, one of which serves as a reference. The light emerging from the top of the vial is spatially integrated and directed to a detector. The detector measures the intensity of the transmitted light, and the electronic circuit determines the difference between the logarithms of the detected signals. This difference is multiplied by a constant to produce a signal representative of the concentration and is displayed. The resolution of the measurement is automatically increased when the processor senses that the signals are too small.
REFERENCES:
patent: 2391076 (1945-12-01), Stevens
patent: 3137758 (1964-06-01), Mason et al.
patent: 3370503 (1968-02-01), Keahl
patent: 3586441 (1971-06-01), Smith et al.
patent: 3676004 (1972-07-01), Prugger et al.
patent: 3704950 (1972-12-01), Rosencranz
patent: 3733137 (1973-05-01), Badessa
patent: 3761183 (1972-09-01), Yuasa et al.
patent: 3887281 (1975-06-01), Kurita et al.
patent: 3902812 (1975-09-01), Honkawa
patent: 3910701 (1975-10-01), Henderson et al.
patent: 4004150 (1977-01-01), Natelson
patent: 4047819 (1977-09-01), Goldberg
patent: 4167331 (1979-09-01), Nielsen
patent: 4248536 (1981-02-01), Hijikata
patent: 4297579 (1981-10-01), Spaeth
patent: 4332469 (1982-06-01), Wendland
patent: 4432642 (1984-02-01), Tolles
patent: 4498782 (1985-02-01), Proctor et al.
patent: 4544271 (1985-10-01), Yamamoto
patent: 4566797 (1986-01-01), Kaffka et al.
patent: 4575240 (1986-03-01), Hess et al.
patent: 4690560 (1987-09-01), Coogan
patent: 4781456 (1988-11-01), Nogani
patent: 4797000 (1989-01-01), Curtis
"Double-Beam Densitometer and Comparator", by Carpenter et al. Analytical Chemistry, vol. 25, No. 10, Oct. 1953, pp. 1473-1477.
Chemetrics, Inc.
McGraw Vincent P.
LandOfFree
Portable spectrophotometric instrument having vial holder and li does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Portable spectrophotometric instrument having vial holder and li, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Portable spectrophotometric instrument having vial holder and li will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-935787