Chinese team develops ‘acoustic rectifier’
OCT 25, 2010
DOI: 10.1063/PT.5.024774
Nature : An “acoustic rectifier” has been developed by a group of researchers at Nanjing University in China, who published their results yesterday in Nature Materials . According to Nature‘s Daniel Cressey, the device allows sound to travel in only one direction, in the same way that electronic diodes allow current to move in only one direction. When sound waves hit a layer of ultrasound gel, it converts some of the energy of the acoustic wave into a wave of double the frequency, and then a lattice of alternating layers of water and glass screens out all frequencies except the second, higher frequency. The device could be useful for medical ultrasound applications.
© 2010 American Institute of Physics
