Method and apparatus for determining the concentration of a targ

Details Method and apparatus for determining the concentration of a targ Method and apparatus for determining the concentration of a targ

1998-11-24

2000-08-01

Snay, Jeffrey

Chemistry: analytical and immunological testing

Optical result

436167, 436134, 422 91, 422119, 356437, G01N 2159

Patent

active

060965606

ABSTRACT:
The concentration of a target gas is determined in an optical gas sensor system having an array of optical gas sensors wherein each sensor has a different sensitivity range for a target gas. An active sensor is selected from the array of optical gas sensors by determining which sensor has an optical transmittance value between 0% and 100%. Optical transmittance values of the active sensor are differentiated with respect to time. Concentration of the target gas is calculated as a function of both the rate of change of optical transmittance and the value of the optical transmittance at the beginning of the period over which the transmittance is differentiated. When a hazardous gas such as carbon monoxide is the target gas an alarm can be given when a threshold concentration is exceeded. Preferably, the transmittance values are converted to digital signals and processed in an eight-bit microprocessor to determine target gas concentration.

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