多波長ホログラムを用いたディジタルホログラフィ粒子計測法に関する一考察

抄録

This paper proposes a digital holographic particle measurement using multi-wavelength holograms for improvement performance in particle measurement. In reconstruction of digital holography, 0th and ±1st order diffracted light waves occur. The 1st order diffracted light wave forms the shape of recorded object, while other two light waves cause noises in reconstructed images. The proposed method reduces the influence of the 0th and -1st order diffracted light waves on the quality of reconstructed images. Further, by using a color camera for capturing digital holograms, it becomes possible to simultaneously record a set of holograms with different wavelengths for adapting digital holographic measurement to dynamic phenomena. Therefore we evaluate the performance of the proposed method in numerical simulation by varying the wavelength of reference light wave. It is shown that the measurement accuracy is improved by the proposed method using multi-wavelength holograms.