Method of and apparatus for determining the amount of...

Details Method of and apparatus for determining the amount of... Method of and apparatus for determining the amount of...

2007-02-13

2007-02-13

Porta, David (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

11181777

ABSTRACT:
Impurity is removed from gas, the resultant gas is introduced into a cell15, and the intensity of light transmitted through the cell15is measured as a reference. Gas containing impurity of which concentration is known, is introduced into the cell15, and the intensity of light transmitted through the cell15is measured with the temperature and pressure maintained at those used at the measurement of the reference light intensity. Then, the absorbance of the impurity is obtained according to the ratio of the two light intensity data obtained by the two measurements above-mentioned. The impurity absorbance thus obtained is stored, in a memory20a, as a function of an impurity concentration. Gas containing impurity of which concentration is unknown, is introduced into the cell15, and the intensity of light transmitted through the cell15is measured with the temperature and pressure maintained at those used at the measurements above-mentioned. The absorbance of the impurity is obtained according to the last-measured light intensity and the reference light intensity. The absorbance thus obtained is applied to the function, thereby to obtain the impurity concentration.

REFERENCES:
patent: 6040915 (2000-03-01), Wu et al.
patent: 6636316 (2003-10-01), Matsumoto et al.
patent: 2002/0061594 (2002-05-01), Itou et al.
patent: 2 054 843 (1981-02-01), None
patent: 2001-228085 (2001-08-01), None
patent: WO 00/42427 (2000-07-01), None
patent: WO 2004/027410 (2004-04-01), None

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