Chemistry: analytical and immunological testing – Heterocyclic carbon compound – Hetero-n
Patent
1983-01-31
1985-04-23
Turk, Arnold
Chemistry: analytical and immunological testing
Heterocyclic carbon compound
Hetero-n
422 57, 422 58, 422 86, 422 91, 436111, 436113, 436165, G01N 2100, G01N 2178
Patent
active
045130876
ABSTRACT:
A device for detecting small amounts of a chemical such as ammonia, and other ammonia-like molecules such as hydrazine or pyridine, in air and in other gases is disclosed. A capillary tube serves as a multiple total reflective medium for an optical beam from a light-emitting diode. The outer surface of the capillary tube is coated with a dye which, when exposed to the chemical, changes color so that the multiply reflected light is modified. The resultant change in the output light intensity from the capillary tube is photodetected and recorded to sense the presence of the chemical. When the chemical is removed, the dye returns to its original color so that the device can be reused.
REFERENCES:
patent: 3617136 (1971-11-01), Lyshkow
patent: 3998591 (1976-12-01), Eckfeldt
patent: 4050895 (1977-09-01), Hardy et al.
patent: 4106909 (1978-08-01), David et al.
patent: 4294513 (1981-10-01), Nelson et al.
patent: 4447546 (1984-05-01), Hirschfeld
Kuznetsova et al., Chemical Abstracts, vol. 95, No. 95:96543q (1981).
Drexhage, "Chemical Abstracts", vol. 87, No. 87:175066z, 1977.
Standardization in Spectrophotometry and Luminescence Measurements, Procengs of a Workshop Seminar held at the National Bureau of Standards, Gaithersburg, Md.-Nov. 19, 20, 1975.
E. E. Hardy et al., "Coated Optical Guides for Spectrophotometry of Chemical Reactions" Nature 257, 666-667 (Oct. 23, 1975).
D. J. David et al., "Direct Measurement of Ammonia in Ambient Air" Analytical Letters 9 (4), 389-404 (1976).
Giuliani John F.
Wohltjen Henry
Beers Robert F.
Ellis William T.
Hill Jr. Robert J.
Klein Alan P.
The United States of America as represented by the Secretary of
LandOfFree
Reversible optical waveguide vapor sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reversible optical waveguide vapor sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reversible optical waveguide vapor sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-37179