Method and apparatus for determining concentration of a gas
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United States of America Patent
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May 2, 2000
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N/A
app pub date -
Jan 21, 1998
filing date -
Jan 21, 1998
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Expired
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Abstract
A method for calibrating a gas measurement device which includes a gas sensing element having an electrical signal output dependent upon concentration of the gas being measured and a diffusion barrier to limit gas entry to the gas measurement device. The gas sensing element is exposed to gas and a steady state current is measured, and then the diffusion barrier is placed in front of the gas measurement device to reduce diffusion, and a second steady state signal is measured. A diffusivity is determined from a coefficient of diffusion of the gas and the physical dimensions of the gas path, and this diffusivity is used together with the first and second steady state outputs to calculate the test concentration of the gas. Subsequent measurements of gas can be corrected using the calculated test concentration.
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