Patent ID: 9194744
Filing Date: 2015-11-24
Classification: G01J,G01N

Abstract:
1. A method for determining, using a computing device, an actual concentration of a gas in a path, the method comprising the steps of: coupling an output from a spectrometer to the computing device; storing on the computing device, reference transmittance data for at least one concentration of the gas and a sample input signal corresponding to an analytical spectrum (I dividing, using the computing device, the analytical spectrum by the reference transmittance data to determine a plurality of residual spectra, including a residual spectrum for each concentration in the reference transmittance data; separating, using the computing device, each of the residual spectra into absorbing and non-absorbing residual portions; and identifying, out of the plurality of residual spectra, a residual spectra with a minimum difference between absorbing and non-absorbing portions; and determining, from the residual spectra with the minimum difference and without a background spectrum I