Gas analysis apparatus and method

Details Gas analysis apparatus and method Gas analysis apparatus and method

1985-06-19

1987-09-01

Willis, Davis L.

Optics: measuring and testing

By polarized light examination

With birefringent element

G01B 902

Patent

active

046905626

ABSTRACT:
An apparatus and method for analysing a gas of the kind adapted to produce an interference pattern displacements of which are indicative of changes of the constitution of the gas involves exposing an array 8 of photosensitive elements to the interference pattern. Respective digital indications of the intensity of the interference pattern falling of the elements are produced by means of a timing circuit 16 adapted to clock data out of the array 8 as a series of analogue pulses which are held by a fast peak detector 17 and converted by an analogue-to-digital converter 18 into digital indications. The position of a principal peak of the interference pattern is then determined by means of a microprocessor (not shown) adapted to determine the best fit of the digital indications with appropriate pre-stored values.

REFERENCES:
patent: 3472598 (1969-10-01), Hossmann
patent: 3487227 (1969-12-01), Kinzly
patent: 3957376 (1976-05-01), Charsky et al.
patent: 4169980 (1979-10-01), Zanoni
patent: 4449823 (1984-05-01), Schwiesow
Nebe, "The Halanometer-a New Measuring Instrument for Inhalation Gas used in Anaesthesia", Jena Review, vol. 16, pp. 97-99, 1971.
Japanese Abstract 58-88610-Nihon Bunkou Kogyo K.K.

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