Opacity meter for monitoring exhaust emissions from non-stationa

Details Opacity meter for monitoring exhaust emissions from non-stationa Opacity meter for monitoring exhaust emissions from non-stationa

1996-05-06

2000-02-15

Hantis, K

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250573, G01N 2159

Patent

active

060259205

ABSTRACT:
Method and apparatus for determining the opacity of exhaust plumes from moving emissions sources. In operation, a light source is activated at a time prior to the arrival of a diesel locomotive at a measurement point, by means of a track trigger switch or the Automatic Equipment Identification system, such that the opacity measurement is synchronized with the passage of an exhaust plume past the measurement point. A beam of light from the light source passes through the exhaust plume of the locomotive and is detected by a suitable detector, preferably a high-rate photodiode. The light beam is well-collimated and is preferably monochromatic, permitting the use of a narrowband pass filter to discriminate against background light. In order to span a double railroad track and provide a beam which is substantially stronger than background, the light source, preferably a diode laser, must provide a locally intense beam. A high intensity light source is also desirable in order to increase accuracy at the high sampling rates required. Also included is a computer control system useful for data acquisition, manipulation, storage and transmission of opacity data and the identification of the associated diesel engine to a central data collection center.

REFERENCES:
patent: 4381153 (1983-04-01), Bohl et al.
patent: 4432649 (1984-02-01), Krause
patent: 4647780 (1987-03-01), Dunkel
patent: 5363198 (1994-11-01), Fournier
patent: 5418366 (1995-05-01), Rubin et al.
patent: 5583765 (1996-12-01), Kleehammer
patent: 5604595 (1997-02-01), Schoen

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