Patent ID: 6710347
Filing Date: 2004-03-23
Classification: G01N

Abstract:
An apparatus for detecting at least one component gas in a sample, comprising:source means for providing radiation along at least one optical path in a pre-selected spectral band, said spectral band having at least one absorption line of the component gas to be detected; at least one optical detector positioned in said at least one optical path and adapted to detect radiation in said pre-selected spectral band and produce at least one detection output; a sample chamber positioned in said at least one optical path between said source and said at least one optical detector and adapted to contain a quantity of sample gas including the component gas to be detected; a gas cell enclosing an amount of said component of gas to be detected, fixedly positioned in said at least one optical path in series with said sample chamber; and a control including an algorithm for determining a mathematical relationship between said at least one detector output and the concentration of a sample gas filling said sample chamber.