Integrating device for measuring transmission of light in...

Details Integrating device for measuring transmission of light in... Integrating device for measuring transmission of light in...

G - Physics

01

N

73/57

G01N 21/59 (2006.01) B07C 5/342 (2006.01)

Patent

CA 1257781

ABSTRACT OF THE DISCLOSURE The apparatus measures the transmission of light in successive falling objects. A beam is projected, wide enough to bathe all the facing surface of the object. An integrating sph- ere is on the other side of the object and its inlet and outlet apertures provide cut-offs so that only a hollow cone of flux scattered from the object is trapped in the integrating sphere, this flux being measured by a detector. The detector is connec- ted to a micro-processor whose output is a measure of the clarity of the object. When the object is not in the beam, the beam falls on a detector so that the reduction in flux sensed by the detector is a measure of the projected area of the object. The micro-processor divides the signal from the detector by the red- uction in flux, thereby making the output substantially inde- pendent of the size of the object.

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