Acoustic holograms of the single slit, the sound source and the cross aperture were obtained using two-phase-electrical reference method.
The image were reconstructed numerically from the holograms, and amplitudes and phases of the propagated waves to the hologram aperture were fully reformed in the one dimensional case.
The Rayleigh-Sommerfeld formula as the inverse transformation function was shown to be applicable under assumptions that the holograms should be obtained in the far field of the insonified objects and the distance from the hologram plane to the objects is greater than the wave-length.
The noise effects on the holograms were classified by the on-off state of the scanner and the sound source, and their effects on the reconstructed image were discussed.
단일 슬릿과 음원, 십자형 음향체에 대한 음파 홀로그램이, 서로간의 위상차가 90도가 되는 두 전기신호를 기준파로 하여 얻어졌고 이러한 홀로그램에서 음원으로부터의 음파와 음원의 모양을 Rayleigh-Sommerfeld 방정식을 이용하여 재구성 하였다. 재구성에 이용된 Rayleigh-Sommerfeld 방정식의 의미와 한계에 대하여 논의 하였고 홀로그램에 영향을 주는 잡음을 분류하고 그들의 특성이 잡음 제거의 관점에서 논의 되었다.
