| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 100 === In this paper, we proposed a three-dimensional (3D) telescope with 25 times of magnification for surface profile measurement of a far object. Two images, recorded at two incident angles of a prism, catched by a CCD camera or a Webcam, are used to calculate the surface profile. One is recorded at the critical angle nearby, and the other is recorded at the angle of total-internal reflection. Based on the critical angle method, the reflectance ratio or the intensity difference is proportional to the surface profile. The intensity ratio between the two images at the same point is proportional to the height relative to the reference point. Thus, the reflectivity pattern is achieved, and the 3D profile is obtained.
The 3D telescope is very compact and it is useful for user to apply it in sufficient light condition. Fluorescent light tube is necessary unless the object is under the status of unsufficient illuminance. Therefore, it is more convenient for users to apply the technique in remote measurements.
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