Laser system for cross-road measurement of motor vehicle exhaust

Details Laser system for cross-road measurement of motor vehicle exhaust Laser system for cross-road measurement of motor vehicle exhaust

1997-08-26

1999-03-02

Kim, Robert

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356440, 250343, G01N 2100

Patent

active

058778624

ABSTRACT:
A cross-road motor vehicle exhaust gas analyzer uses tunable infrared laser differential absorption spectroscopy incorporating photon infrared detection to determine the absolute fractional absorption of a laser by the gaseous medium. Spectroscopic constants of the gaseous species of interest are applied to the absolute fractional absorption to calculate the pertinent absolute column densities. In addition to a laser that sweeps across one or more absorption line of an component of interest, the system of the invention includes a laser source tunable over an absorption line of a reference species; the calculated column density of the reference species is used to normalize the concentration of the component of interest to the fuel consumption rate of the motor vehicle.

REFERENCES:
patent: 4426640 (1984-01-01), Becconsall et al.
patent: 4516858 (1985-05-01), Gelbwachs
patent: 5319199 (1994-06-01), Stedman et al.
patent: 5498872 (1996-03-01), Stedman et al.

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