Navigation Links
Designing an acoustic diode

WASHINGTON, D.C. Nov. 1, 2013 -- Most people know about ultrasound through its role in prenatal imaging: those grainy, grey outlines of junior constructed from reflected sound waves. A new technology called an "acoustic diode," envisioned by researchers in China's Nanjing University, may dramatically improve future ultrasound images by changing the way sound waves are transmitted.

In the journal Applied Physics Letters, which is produced by AIP Publishing, the scientists describe the theoretical framework for an acoustic diode -- a device that achieves a one-way transmission of sound waves much the same as an electrical diode controls the one-way transmission of electrical impulses.

The one-way flow of sound would provide brighter and clearer ultrasound images by eliminating acoustic disturbances caused by sound waves going in two directions at the same time and interfering with each other, explained researcher Jian-chun Cheng.

"The propagation direction of the output wave would be controlled freely and precisely," Cheng said. "These features are crucial for the medical ultrasound applications of the resulting devices."

How the Acoustic Diode Would Work

Sound waves easily flow in two directions. Yet in nature, total reflection of sound in one direction is known to occur at the air-water interface. This gave investigators the idea that an acoustical diode could be constructed by transmitting acoustic waves using an asymmetric prism to create total unidirectional reflection.

The team developed its theoretical model based on a material not found in nature called a near-Zero Index Metamaterial (ZIM) and a prism to create high transmission efficacy acoustic waves that strike a reflective boundary from two opposite sides.

In theory, explained Dr. Cheng, "This would produce a unique tunneling effect and an unprecedented property that the output waveform is kept consistent with those of the waves traveling toward a boundary. "


Contact: Jason Socrates Bardi
American Institute of Physics

Related medicine news :

1. WalkersClub Canada Branches Into Sound Abatement, Offering Acoustic Insulation Panels for Commercial Needs Such as Sound Studios, Movie Theatres, and More
2. Acoustical Solutions, Inc. Opens New Operations Center in Dallas-Fort Worth Metroplex
3. Devotional Singer-Songwriter Brenda McMorrow Raps the Hanuman Chalisa, Acoustic-Style
4. Acoustical Treatment Brings Tidings of Comfort and Joy on ASI Blogs
5. Vibroacoustic Massage Table Designed by Somatron Now Offered by
6. Researchers study cry acoustics to determine risk for autism
7. Direct Diode Expert Silke Pflueger Addresses Their Expansive Impact and Applications at LME 2013
Post Your Comments:
Related Image:
Designing an acoustic diode
(Date:10/13/2017)... ... ... “America On The Brink”: the Christian history of the United States and ... of published author, William Nowers. Captain Nowers and his wife, Millie, have six ... years in the Navy. Following his career as a naval aviator and carrier ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... meet the demand of today’s consumer and regulatory authorities worldwide. From Children’s to ... and tested to meet the highest standard. , These products are also: ...
(Date:10/12/2017)... Maryland (PRWEB) , ... October 12, 2017 , ... ... magnetic drug delivery system that we intend to develop to enable prevention of ... can lead to severe hearing loss, especially in pediatric patients. For cisplatin, hearing ...
(Date:10/12/2017)... FL (PRWEB) , ... October 12, 2017 , ... On ... holding a treadmill relay – Miles by Moonlight to raise money for the American ... $300 or more. , Teams will work together to keep their treadmills moving ...
(Date:10/12/2017)... ... October 12, 2017 , ... Vohra Chief Medical Officer ... physician colleagues, skilled nursing facility medical directors and other clinicians at various events ... Care." , "At many of these conferences we get to educate other physicians, ...
Breaking Medicine News(10 mins):
(Date:9/28/2017)... , Sept. 28, 2017 Hill-Rom Holdings, ... 2017 earnings conference call and webcast on Friday, November ... a.m. (EDT) and ending at approximately 8:30 a.m. (CDT) ... discussing the company,s 2017 financial performance and guidance for ... opportunities, initiatives to enhance operational performance, and long-range financial ...
(Date:9/27/2017)... , Sept. 27, 2017  Commended for their devotion to ... awards. Ranked as number one in the South Florida Business ... in Inc. 5000 yearly list, the national specialty pharmacy has ... Armando Bardisa will soon be honored by SFBJ as ... Set to receive his award in October, ...
(Date:9/25/2017)... --  Montrium , an industry leader in powerful ... Trial Master Files & Inspection Readiness Conference ( ... Services has selected eTMF Connect to ... a leading European contract research organization (CRO), will ... enable greater collaboration with sponsors, improve compliance and ...
Breaking Medicine Technology: