Patent ID: 8143580
Filing Date: 2012-03-27
Classification: G01N

Abstract:
1. A Non-Dispersive Infrared (“NDIR”) gas sensor, comprising: an infrared source compartment containing an infrared source; a sample chamber; a detector compartment, said sample chamber being located optically between the infrared source compartment and the detector compartment, said detector compartment comprising: electronics for processing signals from the first detection channel, the second detection channel and the third detection channel and for calculating a detected concentration of the first gas in a gas sample comprising a combination of the first gas and water vapor in the sample chamber based upon the first output, the second output, the third output and a set of calibration data for the NDIR gas sensor; and wherein the first narrow band pass filter, the second narrow band pass filter and the third narrow band pass filter have a central wavelength and a full width half-maximum bandwidth that are identical and the central wavelength falls within an absorption band of the first gas and water vapor.