Performance limitation of image reconstruction with higher spatial resolution in digital holographic particle measurement

Abstract

This paper presents the test results for checking the performance of digital holographic particle measurement with high spatial resolution by numerical simulation. In this technique, a governing equation, the Fresnel diffraction formula, is numerically solved with the simplest discretization technique to easily adjust the spatial resolution of reconstructed images by a parameter of pixel size on image plane. Performance tests are carried out for four different particle diameters by changing the magnification parameter depending on the pixel size. It is shown from the test results that the RMS error in diameter is saturated at 0.5-0.8 μm that is smaller than one pixel size on a digital hologram, 3.45μm, for any size of particle diameters 10-30μm.