応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
ISSN-L : 0369-8009
計算機による音響ホログラム変換
青木 由直鈴木 洋一
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ジャーナル フリー

1974 年 43 巻 12 号 p. 1213-1218

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A hologram conversion technique by a computer method is proposed and an experiment to convert Fresnel-transform holograms into Fourier-transform holograms is conducted. A photographically recorded acoustical hologram constructed with a 15 kHz sound-wave is sampled with 64×64 sampling points and quantized into 5 levels for numerical processing. The hologram conversion is done by calculating the product of the Fourier spectra of the Fresneltransform hologram with a propagation function. The calculated Fourier-transform hologram is displayed by an X-Y plotter or a line printer and reduced photographically for optical image reconstruction. Images are reconstructed by performing the Fourier transform of the converted hologram in a suitable optical Fourier transform configuration. Some discussions on this numerical hologram conversion technique are conducted with reference to the experimental results.

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