Apparatus for measuring smoke density
First Claim
1. Apparatus for measuring smoke density comprising a probe for insertion into an exhaust gas pipe, a tube connected to the probe for the passage, through the tube, of smoke collected by the probe, a waisted portion of reduced diameter in the tube, plug means located concentrically within the tube to form therewith an annular venturi the throat of which lies at the said waisted portion of the tube, a plurality of holes in the waisted portion of the tube, a light source arranged outside the tube in the vicinity of the waisted portion thereof to pass a light beam along a first straight path into the tube through a first one of said holes in the waisted portion of the tube, transversely through the throat of the venturi, and then out of the tube through a second one of said holes in the waisted portion of the tube, at least one light-reflecting surface arranged outside the tube in the vicinity of the waisted portion thereof to receive the light beam after it has passed out of the tube and to reflect the light beam back into the tube along another straight path which does not coincide with any earlier path of the beam and through a corresponding one of the holes in the waisted portion of the tube, transversely through the throat of the venturi, and then out of the tube through yet another one of the holes in the waisted portion of the tube, a photo-electric cell positioned outside the tube in the vicinity of the waisted portion of the tube to receive the reflected light beam after it has passed out of the tube through a respective one of said holes, and visible display means connected to said photo-electric cell to receive an electrical signal therefrom whereby a visible display is given of the smoke density measured by the apparatus.
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Accused Products
Abstract
Apparatus for measuring smoke density comprising a venturi passage through which smoke can pass, and a light source and at least one light-reflecting surface arranged in the vicinity of the passage to pass and reflect a light beam transversely through the throat of the venturi to form a V-shaped or multiple V-shaped beam.
20 Citations
14 Claims
- 1. Apparatus for measuring smoke density comprising a probe for insertion into an exhaust gas pipe, a tube connected to the probe for the passage, through the tube, of smoke collected by the probe, a waisted portion of reduced diameter in the tube, plug means located concentrically within the tube to form therewith an annular venturi the throat of which lies at the said waisted portion of the tube, a plurality of holes in the waisted portion of the tube, a light source arranged outside the tube in the vicinity of the waisted portion thereof to pass a light beam along a first straight path into the tube through a first one of said holes in the waisted portion of the tube, transversely through the throat of the venturi, and then out of the tube through a second one of said holes in the waisted portion of the tube, at least one light-reflecting surface arranged outside the tube in the vicinity of the waisted portion thereof to receive the light beam after it has passed out of the tube and to reflect the light beam back into the tube along another straight path which does not coincide with any earlier path of the beam and through a corresponding one of the holes in the waisted portion of the tube, transversely through the throat of the venturi, and then out of the tube through yet another one of the holes in the waisted portion of the tube, a photo-electric cell positioned outside the tube in the vicinity of the waisted portion of the tube to receive the reflected light beam after it has passed out of the tube through a respective one of said holes, and visible display means connected to said photo-electric cell to receive an electrical signal therefrom whereby a visible display is given of the smoke density measured by the apparatus.
Specification