The Time Reversal Mirror Can Automatically Select the Brightest Target in Multi-target Media
The focusing of acoustic waves in inhomogeneous media is a common and difficult problem. The focusing can be strongly degraded by sound speed variation and geometrical distortion of the array transducers. So the optimal focusing becomes very ...
Read More >>The Multi-morph Bender Bar, a New Type of Dipole Source Used in Well Logging
Recently, the multi-morph bar, a new type of flexural transducer, is proposed by researchers from the Institute of Acoustics of the Chinese Academy of Sciences for well logging. The multi-morph bar comprises an inert substrate having two pair...
Read More >>A Robust Adaptive Beamforming Method Performs Stably for Improving Ultrasound Imaging Quality
Minimum variance (MV) adaptive beamforming method has been applied in medical ultrasound imaging to improve lateral resolution. Compared with the conventional delay-and-sum (DAS) beamforming method, it can reduce aperture size, increase frame...
Read More >>New Acoustic Logging While Drilling Receiver Simulated with Small Size and Broad Frequency Band
Researchers from the State Key Laboratory of Acoustics, Institute of Acoustics of the Chinese Academy of Sciences simulate a new typed receiver with cavity structure composed by a bi-laminated piezoelectric bender and a hollow cylindrical she...
Read More >>Non-collinear Mixing Method is Feasible to Detect Plastic Zone at Crack Tip
By non-collinear mixing method, a nonlinearity parameter is utilized to evaluate plastic zone at crack tip. A schematic of the proposed non-collinear mixing method of the ultrasonic measurement system. Researchers from the Institute of Acoust...
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