Holographic particle-measuring apparatus

摘要

A holographic particle-measuring apparatus is provided that can improve the precision of measurement by photographing only particles through the elimination of noise. In an off-axis holographic optical image pick-up device (100), object beams (L1) that is a flux of parallel beams are irradiated onto particles (114) as a subject. At the same time, reference beams (L2) are incident, with an inclination, onto the object beams (L1) after being irradiated onto the particles (114). An interference fringe generated as a result of the interference between the object beams (L1) and the reference beams (L2) is recorded onto a recording material Noise elimination relay lenses (116a and 116b) are installed between the particles (114) and the recording material (115). Further, a noise elimination pinhole plate (117) having a pinhole (118) is installed between the lenses (116a and 116b) constituting the relay lens.