By I. Naydenova
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2008a). , 2005). , 2008). The third one used three spherical waves from three laser sources. It provided a compact system for static and dynamic measurement. In this study, after discussing the relationship between phase differences and displacement components, examples of three measurements using microscope, collimated light beams, and three spherical waves from three laser sources, are introduced. 2. , 1998) As an example of phase-shifting digital holography, a Twyman-Green type interferometer shown in Figure 1 is used.
The result is shown in Figure 3(b) though the details of the displacement are described later. It provides more accurate phase-difference distribution than that shown in Figure 3(a). In order to check the effect of the number of the windows on accuracy, the hologram is divided into n square areas by changing n (n=1, 4, 16, 64, 256 and 1024). That is, the original hologram with 960 x 960 pixels is windowed with n window functions whose small square area has value 1 and the remaining area has value 0 in the each window as in Figure 4(a).
14. When the focal points of the reference and object waves are superimposed in the diaphragm which is placed in front of the camera, a uniform background colour is observed on the screen. If the focusing point of reference waves is moved in the plane of the diaphragm, straight 22 Advanced Holography – Metrology and Imaging Concave mirror 1 2 3 MR MG MB Mask Acousto Spatial optical Filter cell Diaphragm Micro-fringes Beamsplitter cube Achromatic lenses Object Flat mirror RR RG RB 3 CCD sensor Camera a) Digital optical bench b) Micro-fringes recording Fig.