Advanced Holography - Metrology and Imaging by I. Naydenova

By I. Naydenova

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In this section, the effect of window size on the standard deviation of error and the spatial resolution are examined when the numbers of the windows are the same (n = 256). The standard deviation and the spatial resolution when the window sizes are 480, 240, 120, 60 Three-Dimensional Displacement and Strain Measurements by Windowed Phase-Shifting Digital Holographic Interferometry 41 and 30 are shown in Table 3 and Figure 17. The spatial resolution becomes worse when the window size becomes smaller.

50% of the light is reflected from the concave spherical mirror to form the three reference beams and 50% of light passes through the test section to form the three measurement waves. The flat mirror, placed just behind the test section, returns the beams towards the beam splitter. 25% of light is focused on the diaphragm which is placed in front of the camera lens. So, 25% of the reference beam intensities are focused in the same diaphragm by the concave mirror. 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.

1% with Slavich holograms which is not acceptable. It can be also seen that the spectrum diffracted by Gentet holograms is wider than the spectrum diffracted by Slavich holograms. 4, the width of the curve is near to 16 nm and 27 nm for the Slavich and Gentet holograms respectively. It is of 10 nm and 17 nm for the blue line. If a small variation of the gelatine thickness is allowed then the wider spectral response of Gentet holograms is advantageous. A bad adjustment of the Fabry-Perot etalon in the argonkrypton laser cavity, meaning that the coherence length was reduced, explains the weakness of the green response in the Slavich graph.

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