Download Acoustical Sensing and Imaging by Hua Lee PDF

By Hua Lee

For complicated working modalities and dimensionalities, the layout and improvement of high-performance sensing and imaging structures symbolize the main direct and demanding advances within the box of approach research and sign processing. during this box, the middle elements are actual modeling, mathematical research, formula of snapshot reconstruction algorithms, functionality evaluate, and approach optimization.

Acoustical Sensing and Imaging covers the total scope of those parts, with an emphasis at the purposes of procedure research and sign processing in acoustical sensing and imaging.

Providing a unified theoretical framework, this book:

Focuses at the solution research within the actual modeling of the structures, accomplishing the research during the quantitative overview of the spatial-frequency spectral insurance Addresses the main parts of sign processing, reminiscent of the layout of the probing waveforms, photograph reconstruction algorithms, errors relief and removing, and picture enhancement Formulates the picture reconstruction algorithms in keeping with the concept that of coherent backward propagation, within the kind of multi-frequency tomography Explains tips to increase process functionality, together with the correction of quadrature section mistakes sooner than picture reconstruction and enhancement with coherent wavefield records throughout the superposition of sub-images offers numerous purposes as examples of varied working modalities, illustrating the technical and academic value of the field

Acoustical Sensing and Imaging guarantees a huge appreciation of the layout suggestions, research, and improvement of high-performance sensing and imaging platforms.

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Extra resources for Acoustical Sensing and Imaging

Sample text

Mathematically, the secondary source function can be described by g′(x, y) as the object distribution modulated by the wavefield of the plane-wave illumination.  − j 2πy  g ′( x , y ) = g( x , y )s( x , y ) = g( x , y ) exp  . 7 Spectral distribution of the received wavefield of transmission and reflection modes. To perform image formation, we first need to properly relate the backward propagated image component to the object distribution, by first removing the contribution from the illumination wavefield.

Suppose z is a constant, representing the distance from the point source to the planar receiving aperture. If we plot the transfer function over the two-dimensional fx − f y plane, the transfer function is lowpass and bounded by a circle of radius 1/λ. It is circularly symmetrical. Within the passband, the transfer function is phase-only with unity magnitude. 4 shows the spatialfrequency coverage of the transfer function. If the wavefield propagates from one plane to another parallel plane, the distance z between the two parallel planes is constant.

By backward propagating the projection p(x) to the object region, an image subcomponent is then formed, and the spectral distribution of this image component is the lower half of the circle, the semicircle toward the direction of the aperture. The other half of the circular spectrum corresponds to the reflection-mode wavefield, which can be obtained by placing an aperture on the same side of the transmitter. We should also note that the transmission and reflection modes share different portions of the spectral distribution of the resultant wavefield.

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