Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-08-19
1989-01-31
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, G01N 2137
Patent
active
048018058
ABSTRACT:
A method is disclosed of making an on-line gas analysis of a multicomponent gas emission flow by (a) continuously sequestering a sample flow from the gas emission flow, which sample flow has been filtered to substantially eliminate solid or liquid particles, diluted to lower its dew point to below room temperature, and changed in either temperature and/or pressure to be substantially the same in temperature and pressure as that of gases used to create reference transmission frequency spectral data deployed in step (d); (b) continuously irradiating the sample flow with an electromagnetic radiation beam while modulating the amplitude of infrared frequencies in the audio frequency range of the beam, either prior to or immediately subsequent to irradiation of the sample flow, to produce electromagnetic signals having discernible amplitude variations resulting from spectral interference patterns; (c) detecting and collecting the signals at a sufficiently high rate to substantially completely distinguish between adjacent spectral pattern amplitude peaks without mutual spectral interference and to permit analysis of the signals in real time; and (d) analyzing the signals in real time by (i) mathematically manipulating the signals in accordance with Beer's Law to create reformed background-corrected data, and (ii) applying reference transmission frequency spectral data to the reformed data for each suspected gaseous component to give a linear quantitative measure of the presence of each and every suspected gas component in the gas emission flow.
REFERENCES:
patent: 3897154 (1975-07-01), Hawes
patent: 4227083 (1980-10-01), Sherinski
patent: 4549080 (1985-10-01), Baskins et al.
patent: 4652755 (1987-03-01), Solomon et al.
SAE Paper #810429 (1981), "On-Line Characterization of Vehicle Emissions by FT-IR and Mass Spectrometry", Butler et al.
Butler James W.
Colvin Alex D.
Korniski Thomas J.
Maker Paul D.
Ford Motor Company
Howell Janice A.
Malleck Joseph W.
May Roger L.
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