| 摘要 |
An apparatus for determining measurements of an object moving along a conveyor path having a support surface is provided. The apparatus includes an object detector for detecting the leading edge of the object and an object speed detector for generating an object speed signal. A light source generates a light beam having a sharp edge which extends across the support surface in a direction transverse to a direction of movement of the object to define a light beam intersect path on the support surface. An image sensor detects the light beam intersect path on the support surface only in areas not obstructed by the object and generates a negative image profile signal. A signal processor is provided in communication with the object detector, the object speed sensor and the image sensor which receives the leading edge signal, the object speed signal and the negative image profile signal and calculates the object size.
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