Download e-book for iPad: Acoustical Sensing and Imaging by Hua Lee
By Hua Lee
For complicated working modalities and dimensionalities, the layout and improvement of high-performance sensing and imaging platforms symbolize the main direct and important advances within the box of approach research and sign processing. during this box, the middle parts are actual modeling, mathematical research, formula of picture reconstruction algorithms, functionality evaluate, and process optimization.
Acoustical Sensing and Imaging covers the complete scope of those elements, with an emphasis at the purposes of process research and sign processing in acoustical sensing and imaging.
Providing a unified theoretical framework, this book:
Focuses at the answer research within the actual modeling of the platforms, carrying out the research throughout the quantitative review of the spatial-frequency spectral insurance Addresses the major components of sign processing, corresponding to the layout of the probing waveforms, photograph reconstruction algorithms, blunders aid and elimination, and snapshot enhancement Formulates the picture reconstruction algorithms in accordance with the idea that of coherent backward propagation, within the type of multi-frequency tomography Explains how you can enhance method functionality, together with the correction of quadrature section mistakes ahead of snapshot reconstruction and enhancement with coherent wavefield information in the course of the superposition of sub-images offers numerous functions as examples of varied working modalities, illustrating the technical and academic importance of the field
Acoustical Sensing and Imaging guarantees a vast appreciation of the layout suggestions, research, and improvement of high-performance sensing and imaging platforms.
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Additional info for Acoustical Sensing and Imaging
By nature, the integration operations of the algorithm provide good tolerance against noise. The simplicity also translates into savings in computation time and power consumption. Consider the simple case of one transmitter and two receivers. The spacing of the twin receiver pair is D, similar to the previous case. The received signals at the twin receivers are the offset versions of the same signal. We then take the difference of these two signals and apply the double-integration algorithm. From the previous analysis, the final value out of the direct- integration method is in the similar form of Final value = cD |H(0)|2 sin(θ) v where θ is the bearing angle with respect to the vector defined by the receiver pair.
For simplicity, the impulse functions and plane waves are first analyzed. 1 Impulse Functions The impulse function is typically introduced as a time function in signal analysis and processing, in the form of ∞ δ(t) = 0 t=0 otherwise 23 24 Acoustical Sensing and Imaging with the normalization formula ∫ δ(t) dt = 1 In the field of imaging, the functions include spatial variables, which is in the form of four-dimensional distributions f(x, y, z; t). So, it is necessary to examine the representations and meanings of impulse functions in the space domain.
It is also important to point out that the angular span of the wavefield spectrum is governed by the aperture size and is independent of the operating mode, transmission or reflection, of the imaging system. Hence, the angular span is identical for both the transmission and receiving modes when the aperture size is fixed. After the demodulation process to remove the contribution due to the illumination wavefield, the spatialfrequency spectral content shifts similarly. A tomographic angular scan is then conducted in a similar manner to expand the spectral coverage.
Acoustical Sensing and Imaging by Hua Lee