| 摘要 |
PURPOSE:To accurately measure the shape of even an objective body which provides large light reflection by irradiating the objective body with two light beams which are polarized at right angles to each other and picking projection images which are formed as a result with polarized light beams corresponding to their respective polarization directions. CONSTITUTION:Light emitted by a light source B is polarized by a polarizing plate P1 to illuminate the body A to be measured and further transmitted through the polarizing plate P1 to reach a TV camera D. In this case, a shadow corresponding to the body A to be measured is picked up by a camera D. Light emitted by a light source C, on the other hand, is polarized by a polarizing plate P2 at right angles to the light transmitted through the polarizing plate P1 to illuminate the body A to be measured and transmitted through the polarizing plate P2, so that its shadow is picked up by a TV camera E. Then, when the light from the light source B which is transmitted through the polarizing plate P1 to illuminate the objective body A is reflected and scattered in the direction of the camera E, it can not be transmitted through the polarizing plate P2 provided in front of the camera E, so it is neither incident on nor picked up by the camera E. Namely, only the projection images irradiated with the corresponding light beams are picked up by the cameras D and E, so the shape of the objective body A is accurately measured.
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