位相シフト走査モアレ法による実時間等高線・等変位線表示装置の開発 Development of Real-time Display System for Contour Line and Equal-displacement Line by Phase Shifting Scanning Moire Method

A scanning moire method was previously proposed to measure shapes in real-time. In this method, contour lines of an object are obtained in a moment as a moire pattern with sampling a grating image at every several scanning line. The disadvantage is that the image has jagged noise. In this paper, therefore, a new method to obtain a smooth scanning moire without the noise is proposed. In this method, the image of contour lines is obtained by sampling process synchronized with the phase of a projected grating that is shifted continuously. It is called the phase shifting scanning moire method. The principle, applications to shape and displacement measurements for actual objects and a real-time display system developped using this method are shown.