Opacity monitor
AssigneeThe Babcock & Wilcox Company
InventorsThomas L. Bohl, George R. Hall, Jr., Sharon L. Zimmerlin
Life of this patent
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Abstract
An opacity monitor (10) including a light source (12) mounted on one side of a duct (14), and a detector (16) mounted on the opposite side of the duct is disclosed. The light source (12) and the detector (16) are rotated by motor means (26, 36), respectively, between a first position aligned with each other along an open light path defined across the duct (14) and a second position aligned with each other on opposite sides of a calibration tube (18) extending across the duct (14). Shutters (28, 38) rotate with the light source (12) and the detector (16), respectively, and are aligned with the calibration tube (18) when the light source (12) and the detector (16) are aligned with the open light path, and vice versa.
Claims5
In an opacity monitoring system comprising a light source mounted on one side of a duct, a detector mounted on the opposite side of the duct, and means defining an open light path across said duct between said light source and said detector, a calibration tube extending across said duct and closed to the interior of said duct, means mounting said light source for rotation about a first axis substantially perpendicular to the direction of flow through said duct, means mounting said detector for rotation about a second axis substantially perpendicular to the direction of flow through said duct, means for rotating said light source about said first axis from a first position aligned with said calibration tube, means for rotating said detector about said second axis from a first position aligned with said light path to a second position aligned with said calibration tube, first motor means for rotating said light source about said first axis, second motor means for rotating said detector about said second axis, and control means electrically connected to said first and second motor means and operable to energize said first and second motor means to rotate said light source and said detector in unison.
Dependencies are inferred from the claim text.