Method and apparatus for modulating a gas sample for a calorimet

Details Method and apparatus for modulating a gas sample for a calorimet Method and apparatus for modulating a gas sample for a calorimet

1996-12-20

1999-01-26

Snay, Jeffrey

Chemistry: analytical and immunological testing

Measurement includes temperature change of the material...

436152, 422 51, 422 95, G01N 2532

Patent

active

058638032

ABSTRACT:
A method and apparatus is provided for modulating flux of combustibles reacting with oxygen impinging on a calorimetric gas sensor. The method includes the steps of enclosing a sensing element and a reference element of a calorimetric gas sensor with an apparatus having at least one aperture to allow combustibles to enter and impinge on the sensing element and reference element, periodically restricting the aperture of the apparatus to modulate the flux of combustibles entering at a predetermined frequency to produce an AC output signal from the calorimetric gas sensor, and measuring the sensor output at the frequency at which the aperture is restricted.

REFERENCES:
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patent: 4833909 (1989-05-01), Matthiessen
patent: 5265417 (1993-11-01), Visser et al.
patent: 5451371 (1995-09-01), Zanini-Fisher et al.
patent: 5486336 (1996-01-01), Dalla Betta et al.
patent: 5527446 (1996-06-01), Kosek et al.

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