FFT analysis method for pulse laser in-line hologram of small particles

Kunihito Nagayama; Sachiko Hatano; Keishi Nishihara

doi:10.1117/12.350524

22 June 1999 FFT analysis method for pulse laser in-line hologram of small particles

Kunihito Nagayama, Sachiko Hatano, Keishi Nishihara

Proceedings Volume 3516, 23rd International Congress on High-Speed Photography and Photonics; (1999) https://doi.org/10.1117/12.350524
Event: Twenty-Third International Congress on High-Speed Photography and Photonics, 1998, Moscow, Russian Federation

Abstract

This paper describes a novel idea of image analysis method of pulse laser in-line hologram of particles to obtain information on particle diameter. Present method is based on the following property of the hologram. Fringe interval of the hologram decreases with radius, and the corresponding spatial frequency increases with radius. Fourier transformed pattern of the hologram, therefore, has the similar properties. We have proposed here the use of this FFT pattern of the hologram for the image analysis. It is shown that the FFT pattern has a white ring zone, which corresponds to the zero-point of the envelope function of original fringe pattern. It is demonstrated that measurement of the diameter of this ring gives a reliable way of obtaining particle diameter. Feasibility of the method has been shown by numerical experiment for Fraunhofer and Fresnel hologram.

Citation Download Citation

Kunihito Nagayama, Sachiko Hatano, and Keishi Nishihara "FFT analysis method for pulse laser in-line hologram of small particles", Proc. SPIE 3516, 23rd International Congress on High-Speed Photography and Photonics, (22 June 1999); https://doi.org/10.1117/12.350524

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KEYWORDS

Holograms

Particles

Spatial frequencies

Signal attenuation

Bessel functions

Image analysis

Pulsed laser operation

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