Acoustic interferometer

About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.

Acoustic beam splitting at low GHz frequencies in a defect-free phononic crystal

Abstract: The directional waveguiding in a 2D phononic crystal is simulated based on the analysis of equifrequency contours. This approach is utilized to investigate acoustic beam splitting in a defect-free nanostructure in the low GHz range. We find relaxed limitations regarding the source parameters compared to similar approaches in the sonic regime. Finally, we discuss the possibility to design an acoustic interferometer device at the nanoscale at GHz frequencies.

Observation of Laser‐Induced Acoustic Waves in SF6

Abstract: The acoustic waves reported by Bates et al. are directly observed by means of a solid‐dielectric capacitance microphone. The initial time development of the pressure wave indicates that the vibration–vibration energy transfer rate in SF6 is not less than 2 × 106 sec−1·Torr−1.

Method and device for applying pressure waves to the body of an organism

Abstract: A method and device are described for applying extracorporeally generated pressure waves, specifically acoustic shock waves, to the body of an organism. The effect of the shock waves in the impacted target area of the body is measured by extracorporeally disposed detectors which record the acoustic signals, the acoustic signals being generated within the tissue by the cavitation bubbles caused by the shock waves. The measured cavitation effect may be utilized to control and adjust the dosage of shock waves. The use of focused detectors allows for spatial scanning of the cavitation effect—with the result that the focus of the shock waves may be controlled, the tissue structure may be scanned, and the pressure field of the shock waves may be mapped.

Two-dimensional coils for electro-magnetic generation and detection of acoustic waves

Abstract: Apparatus and method for producing and detecting magnetic and non-magnetic acoustic waves in a conductive body, wherein the waves are generated electromagnetically by a constant amplitude wave front transmitted to a surface of the body by a twodimensional, flat, spirally wound coil in a plane parallel to and spaced from the conductive surface, and like coil means or a quartz transducer are used for detection. Specific transducers having dual, race-track shaped, two-dimensional coils are described for selectively generating and detecting magnetic directly generated acoustic waves when the body is immersed in a magnetic field, and non-magnetic directly generated acoustic waves when the magnetic field is reduced or removed entirely. A single spiral, two-dimensional coil, is also used for selectively producing and/or detecting the non-magnetically generated acoustic waves.