Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1993-04-13
1994-12-06
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2502521, G01N 2101, G01N 2135
Patent
active
053713672
ABSTRACT:
Apparatus for detecting and measuring relative concentrations of pollutants such as HC, CO and CO.sub.2 in the exhaust emissions from passing vehicles includes an infrared (IR) beam source for directing an IR beam through a vehicle's exhaust plume and a detector disposed on one side of a roadway and a lateral transfer mirror (LTM) disposed on the other side of the roadway for lateral reflecting of the IR beam back through the vehicle's exhaust plume and onto the detector. The LTM allows for close spacing and precise alignment between the emitted and reflected beam paths and permits the IR beam source and detector to be disposed in a single module. Compensation for variation in a range of vehicle operating conditions is provided by adjustable, computer-controlled potentiometers, while audio and/or visible light feedback of the detected IR signal allows a single operator to precisely align the optical components of the apparatus. The IR detector module includes a rotating mirror arrangement for directing the reflected IR beam in a pulsed manner onto a plurality of spaced detector elements, each adapted for detecting a specific pollutant, with the detector elements calibrated with each detected IR pulse to reduce errors arising from circuit drift.
REFERENCES:
patent: 4674870 (1987-06-01), Cain et al.
patent: 4924095 (1990-05-01), Swanson, Jr.
patent: 5210702 (1993-05-01), Bishop et al.
Chaney, "The Remote Measurement of Traffic Generated Carbon Monoxide", Journal of the Air Pollution Control Association, vol. 33, No. 3, 1983, pp. 220-222.
Stedman, "Automobile Carbon Monoxide Emission", Environ. Sci. Technol., vol. 23, No. 2, 1989, pp. 147-149.
Bishop et al., "IR Long-Path Photometry: A Remote Sensing Tool for Automobile Emissions", American Chemical Society, 1989, 361-671A, 6 pages.
DiDomenico John
Johnson James H.
Michaels Kenneth W.
Smith Dennis L.
Stedman Donald H.
Colorado Seminary
Envirotest Systems Corp.
Glick Edward J.
Hannaher Constantine
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