There is an increasing demand in industry and medicine for the noncontact measurement of the shape of a 3-D object. Various studies are being made to develop highly accurate and simple means of such measurements. When a laser light is incident to the fiber grating in the vertical direction, a square spot array is produced. When the array is projected on a 3-D object with a general shape, the array is distorted. By using the distortion as the data for the processing, the 3-D shape can be measured strictly. This paper reports on the 3-D shape measurement using an optical fiber grating. No particular application is considered in the design of the system. The projector of the spot array can be constructed with a lightweight and small size, and it is suitable as a built-in device for the endoscopy, or a visual device to be installed directly on the industrial robot arm.
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