Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1997-01-31
1998-08-25
Gutierrez, Diego F.F.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374127, 374142, 2503385, 25033913, G01J 506, G01N 2125
Patent
active
057976821
ABSTRACT:
A system (10) for simultaneously measuring temperature and CO, CO.sub.2 and HC gas content of vehicle (11) exhaust detects and analyzes a beam of infrared electromagnetic radiation (21) projected through a plume (13) of vehicle exhaust to assess the concentration of CO, CO.sub.2, and HC in the vehicle exhaust and detects and analyzes infrared electromagnetic radiation (15) emitted by the plume (13) to assess the temperature of the plume (13) and, consequently, whether the vehicle's (11) catalytic converter is operating in the cold or hot mode. Essentially simultaneous measurement is taken by intermittently interrupting the beam (21) of projected infrared electromagnetic radiation and detecting and analyzing the emitted infrared radiation (15) during the intervals of interruption when the beam (21) is not projected through the plume (13). Intermittent projection of the beam (21) is accomplished by insertion of a chopper wheel (22) between an infrared beam projector (20) and the plume (13).
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Smith et al "Spectroscopic Method for Simulaneous Determination of Species Concentration and Temperature in a Cyclic Composition Process", The Review of Scientific Instruments., vol. 40 No. 12 (Dec. 1969) pp. 1541-1544.
Jack Michael D.
Kert John
Stephens Robert
Envirotest Systems Corp.
Gutierrez Diego F.F.
Worth Willie Morris
LandOfFree
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