| 摘要 |
<p>Provided are: an optical device for shape and gradient detection and/or measurement which has a simple structure, is robust to external disturbance, and enables accurate measurement of the gradient angle of an object surface, including a human body; a method for optical shape and gradient detection and/or measurement; and a circularly polarized light illumination device. The optical device for shape and gradient detection and/or measurement uses the optical reflection characteristics of the surface of an object to detect and/or measure the surface shape or gradient of an observed object, and is provided with an illumination device and a polarized light image detection device. The illumination device makes the incident light, which surrounds the periphery of the object and is essentially a known perfect polarized light, fall uniformly. The polarized light image detection device detects a polarized light ellipse of the perfectly polarized light component of a light beam group, which is specularly reflected by the object surface and radiated at a particular azimuth angle. The optical device measures the gradient angle with respect to the radiated light beam of the reflection surface in a step 1 in which the orientation of the incident plane is detected from the observed azimuth angle value of the polarized light ellipse for the reflecting surface of the object which forms an incident point for each reflected and radiated light beam, and a step 2 in which the incident angle is detected from the ellipticity logic value of the polarized light ellipse. The method for optical shape and gradient detection and/or measurement is carried out using the same operation.</p> |
