Comparison of Clean-sc for 2d and 3d Scanning Surfaces 4th Berlin Beamforming Conference
نویسندگان
چکیده
We present experimental data comparing the accuracy obtained for 2D and 3D scanning surfaces using CLEAN-SC deconvolution of beamformed acoustic maps. A spherical array is used to obtain recordings from a dense point cloud of sound source locations. Beamforming and CLEAN-SC acoustic maps are generated using traditional 2D scanning surfaces and 3D scanning surfaces corresponding to the surface geometry of an object being acoustically imaged. Results for the 3D method show improved accuracy of measured positions and magnitudes of sound sources under a range of circumstances. The most benefit, in regard to position error, is for frequencies above 5kHz and sound sources located less than a metre from the array. In these circumstances, the three-dimensionality is more dominant.
منابع مشابه
Adaptive beamforming in row-column addressed arrays for 3D ultrasound imaging
In recent years, to reduce the complexity of implementation, the use of 2D arrays with restricted row-column addressing has been considered for 3D ultrasound imaging. In this paper, two methods of adaptive beamforming based on the minimum variance method are represented in such a way that the computational load is much less than using the full adaptive beamforming method. In both proposed metho...
متن کاملTwo Robust Super Resolution Approaches in Aeroacoustic Imaging for Near-field Wideband Extended Sources
Recently deconvolution-based methods, like the DAMAS, have greatly improved spatial resolutions of the Beamforming in aeroacoustic imaging. But most of existing methods are not robust to background noise. In this paper, we propose two robust superresolution approaches using Sparsity Constraint (SC-RDAMAS) and Sparse Regularisation (SR-RDAMAS) respectively to simultaneously estimate source power...
متن کاملSelf-Consistent MUSIC algorithm to localize multiple sources in acoustic imaging 4TH BERLIN BEAMFORMING CONFERENCE
The Multiple Signal Classification (MUSIC) algorithm is a standard method to localize acoustic sounds as well as brain sources in electroencephalography (EEG) and magnetoencephalography (MEG). In one of its variants used for EEG/MEG source analysis, called RAP-MUSIC, sequential projections were proposed to properly identify local maxima of the gain function as origins of true sources. The purpo...
متن کاملPhased array ultrasonic imaging using an improved beamforming based total focusing method for non destructive test
One of the novel ultrasonic phased array based scanning methods for ultrasonic imaging in non-destructive test is total focusing method (TFM). This method employs maximum available information of the phased array elements and leads to an improved defect detection accuracy compared to conventional scanning methods. Despite its high detection accuracy, TFM behaves weak in distinguishing the real ...
متن کاملThe Comparison 2D and 3D Treatment Planning in Breast Cancer Radiotherapy with Emphasis on Dose Homogeneity and Lung Dose
Introduction: Breast conserving radiotherapy is one of the most common procedures performed in any radiation oncology department. A tangential parallel-opposed pair is usually used for this purpose. This technique is performed using 2D or 3D treatment planning systems. The aim of this study was to compare 2D treatment planning with 3D treatment planning in tangential irradiation in breast conse...
متن کامل