Abstract
This paper discusses the feasibility of multi-wavelength method in image reconstruction of digital holography for particle measurement. In particle measurement based on digital holography, it is the most important for higher accuracy to reduce the elongation of reconstructed particle image along depth direction. An effective technique of multi-wavelength method is proposed in this paper for suppressing the particle image elongation by reconstructing images with some light waves of different wavelengths. Numerical simulations are carried out to check the performance of the proposed technique. The results of numerical simulations show that the elongation of particle image can be much reduced as compared with conventional single-wavelength method. The application results of the present method to air-bubbly flow demonstrate to show the possibility of successful tracking of a lot of tiny air bubbles in a time-series of numerically reconstructed volume.
