- Conference date: 09–13 September 2009
- Location: Alexandroupolis (Greece)
The acoustic field, transmitted through parallelepiped from fused silica (immersed in water) is registered, which parallelepiped acts the part of slit with a finite thickness. It is shown, that the finite thickness leads to a change of the acoustic wavelength and the distance up to a registration plane. The distance increases, if the acoustic velocity in the material is higher than that in water, independently of actual distance between the slit and data plane. It is shown, if the slit with finite thickness is placed, the Fresnel zone may be changed in comparison with that observed at the diffraction through infinite thin slit at the same distance (up to a registration plane) for given wavelength. Program module is created by MatLab program for simulation of the diffraction field trough an infinite slit. The experimental results are compared with the theoretical ones, obtained from the simulation. The simulation results shown, that at diffraction trough a slit with finite thickness, the registration distance of the far‐field diffraction increases, i.e. the Fraunhofer zone may be drawn forward. The image of the object may be obtained in this case directly by inverse Fourier transformation from the registered data in the Fraunhofer zone.
- Acoustic wave diffraction
- Acoustic wave velocity
- Acoustic waves
- Fourier transforms
Data & Media loading...
Article metrics loading...