| 摘要 |
The present invention is related to an optical method of shape determination for a three-dimensional object. Conventional methods have been found clumsy and costly. In the method according to the invention, a surface of light-diffusing material (1) is placed at one side of the measurement point of the cross-sectional periphery of said object (3), on which surface by means of a scanning laser beam (10) is formed a light source (9) sweeping in the plane of the cross section to be measured, and that at the other side of said object are located a plurality of sensors (6, 7, 8) correspondingly aligned toward the object in the plane of said cross section to be measured, said sensors serving to detect rays emitted by said scanning light source (9). Each shadowing or unshadowing of the rays from the light source as detected by each of the sensors (6, 7, 8) is indicative of a tangential point on the cross-sectional periphery of the object (3), whereby, provided that the position of the light source is known as a function of time, a reconstruction of the peripheral cross section of the object (3) can be made from the detected tangential points of its periphery. Further, by moving the object in relation to the measurement means in a direction perpendicular to that of the cross section measurement, a reconstruction of the three-dimensional peripheral shape of the object can be made from the succession of thus reconstructed peripheral cross sections.
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