Method and apparatus for determining the alcohol concentration i

Details Method and apparatus for determining the alcohol concentration i Method and apparatus for determining the alcohol concentration i

1996-12-19

1998-08-11

Wong, Don

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250344, G01N 2161

Patent

active

057930430

ABSTRACT:
An apparatus for determining the alcohol concentration in a gas mixture, which may contain a number of such interference components that have substantial absorption within the range of the alcohol absorption line to be presently determined, by means of a method based on the absorption of infrared radiation. The apparatus comprises: a radiation source (1); a chamber (4) for receiving a gas mixture (6) to be measured, said chamber being provided with windows (7a, 7b) whereby a radiation (2) passes through the gas mixture; a detector (13) which receives the radiation having passed through the gas mixture and transforms it to an electric state for further processing; between the radiation source and the detector an optical interference filter (10), which has a narrow radiation transmission band and which is pivotable (P) relative to the main traveling direction of radiation for changing the wavelength range of the filter's transmission band. The transmission band of the optical interference filter (10) has a mean wavelength which is within the range of 7.5 .mu.m-12.5 .mu.m and this transmission band of the interference filter (10) has a half-width which is more than 1.5% of said mean wavelength.

REFERENCES:
patent: 3562524 (1971-02-01), Moore et al.
patent: 4268751 (1981-05-01), Fritzlen et al.
patent: 4914719 (1990-04-01), Conlon et al.
patent: 5070245 (1991-12-01), Rantala et al.
patent: 5693945 (1997-12-01), Akiyama et al.
patent: B13792272 (1986-07-01), Harte et al.

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