Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-06-08
1994-06-07
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503391, 250347, 250349, 356438, G01N 2100, G01N 2101, G01N 2117
Patent
active
053191994
ABSTRACT:
A gas analysis device (10) for the remote detecting, measuring and recording of NO.sub.x, CO, CO.sub.2, HC and H.sub.2 O levels from the exhaust (30) of moving motor vehicles (28) utilizes a source (11) of collimated infrared and ultraviolet radiation (15) and includes a detector unit (16) positioned on the opposite side of the roadway for receiving and measuring the infrared and ultraviolet radiation from the source (11) tranmitted through the vehicle exhaust. The detector unit splits the combined infrared and ultraviolet radiation into separate infrared and ultraviolet beams (42) and (40). An ultraviolet sensor (44) receives the separate ultraviolet beam and generates a signal indicative of NO.sub.x. A rotating reflector (27) time-multiplexes the infrared beam to a plurality of infrared sensors that generate electrical signals indicative of, for example, CO, CO.sub.2, HC and H.sub.2 O in the vehicle exhaust. A computer (17) then computes the relative concentrations of CO, CO.sub.2, HC, NO.sub.x, and H.sub.2 O in the path of the infrared and ultraviolet radiation from the source, thereby measuring vehicle emissions.
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Bishop Gary A.
Stedman Donald H.
Colorado Seminary
Glick Edward J.
Hannaher Constantine
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