Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1983-07-08
1984-11-13
Arnold, Bruce Y.
Optics: measuring and testing
By particle light scattering
With photocell detection
G01N 2100
Patent
active
044822472
ABSTRACT:
A sensor employs a laser to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture which, in turn focuses the scattered light on a first photodetector. A second photodetector receives directly transmitted light energy. A ratio between the output signals of the two photodetectors is derived and presented to a threshold level detector. If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occurred. The optical system is carefully selected to ensure that only light energy scattered from a sample volume within the entrained gas flow reaches the first photodetector. This is important because it prevents particulate matter on the surfaces of the transparent windows from affecting the operating of the sensor.
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Dunphy James R.
Foster Martin C.
Meltz Gerald
Newman Leon A.
Arnold Bruce Y.
Lange Richard P.
Sabath Robert P.
United Technologies Corporation
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