Navigation Links
'Orca ears' inspire Stanford researchers to develop ultrasensitive undersea microphone
Date:6/23/2011

r this year.

What orcas, humans and other creatures perceive as sound consists of small fluctuations in pressure. When someone beats a drum, it is the flexing of the membrane on the drum, first deflecting then rebounding, which causes the sound waves that we can hear. A microphone detects those sounds by means of a membrane or diaphragm inside it that vibrates in response to the pressure waves of sound that reach it.

Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.

But in the ocean, for every 10 meters you descend below the surface, the water pressure around you increases by the equivalent of 1 atmosphere the air pressure we feel at the surface.

The deepest point on the planet, the Challenger Deep in the Mariana Trench in the South Pacific, lies approximately 11,000 meters (almost 7 miles) below sea level. At that depth, the pressure is approximately 1,100 times the air pressure at Earth's surface.

"The only way to make a sensor that can detect very small fluctuations in pressure against such immense range in background pressure is to fill the sensor with water," Kilic said.

Letting water flow into the microphone keeps the water pressure on each side of the membrane equal, no matter how deep.

Kilic and his colleagues fabricated a silicon chip with a thin membrane about 500 nanometers thick about 25 times thinner than common plastic wrap and drilled a grid of tiny nano-holes in it, to allow water to pass in and out.

But unlike air, water is virtually incompressible, so having water on each side of the diaphragm damped the amount that the diaphragm could move in response to any given sound waves that struck it.

"The kind of displacements you get of the diaphragm for the quietest sounds in the ocean is on the order of a hundred-thousandth of a nanometer," Kilic
'/>"/>

Contact: Louis Bergeron
louisb3@stanford.edu
650-725-1944
Stanford University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Where will grizzly bears roam?
2. Restoring the European Beaver: 50 Years of Experience by G. Sjoberg and J.P. Ball
3. Poisonous tears
4. Alzheimers risk gene disrupts brains wiring 50 years before disease hits
5. Beware of predatory male black bears
6. University of Tennessee scientist: Flowers rapid growth rate can be traced back 65 million years
7. Drug-resistance fears for deadly fungal disease
8. Port Valdez invertebrates stabilized 26 years after quake
9. Green toad inhabited Iberian Peninsula 1 million years ago
10. Pollen also appears outside flowering season
11. Neuropsychologist proves that some blind people see with their ears
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/16/2014)... Spanish . CRG ... the Journal of Cell Biology describes how Topo ... division , At this very moment thousands of our body,s ... which the body repairs damaged tissues and regenerates others like ... as "mitosis", during which the cell duplicates its genetic material ...
(Date:9/16/2014)... vital functions in an organism. For example, they ... and control immune system responses. Researchers established some ... of each other, but instead form complex networks. ... find many similarities with online social networks," says ... Systems Biology. "Some proteins are good networkers that ...
(Date:9/16/2014)... , Sept. 16, 2014 As open ... make important decisions about their 2015 benefits. According to ... health solutions business of Aon plc (NYSE: ... take a more proactive role in managing their health ... than ever for individuals to understand how they can ...
Breaking Biology News(10 mins):Unraveling cell division 2Unraveling cell division 3Good networkers make prime targets 2Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 2Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 3Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 4Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 5Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 6Aon Hewitt Provides Tips to Help Workers Prepare for the Upcoming Open Enrollment Season 7
... , EAST LANSING, Mich. Bacteria infections most of ... world and not malaria are the leading cause of ... new Michigan State University project based in Nigeria and funded ... diseases by collecting local data on the ailments, spurring vaccine ...
... European Molecular Biology Laboratory (EMBL) in Monterotondo, is one ... honoured with a Howard Hughes Medical Institute (HHMI) International ... for five years, is designed to give a boost ... United States. The award recognises the potential of Sotillo,s ...
... concern that excessive levels of fructose may pose a great health ... researchers at the University of Colorado School of Medicine, along with ... if two common sweeteners in western diets differ in their effects ... The study, recently published in the journal Metabolism , took ...
Cached Biology News:$5.8 million Gates grant targets child-killing bacteria diseases in Africa 2CU School of Medicine researchers look at effects of 2 common sweeteners on the body 2
(Date:9/16/2014)... cell phones to cars and flashlights, batteries play ... technology companies constantly are seeking ways to improve ... time using a water-based solution, researchers at the ... more efficient nuclear battery that could be used ... source in automobiles and also in complicated applications ...
(Date:9/16/2014)... BlueInGreen® , a water ... for delivering dissolved gases into liquids, announced the ... a manufacturer’s representative firm to its sales network. ... municipal water and wastewater applications in the Canadian ... founded in 1992 and serves Quebec and Ontario ...
(Date:9/16/2014)... MILLBROOK, N.Y. , Sept. 16, 2014  Donald Fresne, ... the appointment of Stephan Vagner , PhD to its ... the University of Toulouse, France , performed ... Germany , and at Inserm, the French institute of ... Inserm and works both at the Curie Institute, Orsay, ...
(Date:9/16/2014)... , Sept. 16, 2014  The Council ... entrepreneurial support organization in the country, today released ... Report . It showed that ... North Carolina startups in the technology, ... more global investment from a variety of sources. Significant ...
Breaking Biology Technology:BlueInGreen® Expands into Canada – Signs Representative Agreement with H2Flow Equipment Inc. 2New Appointment to the Scientific Advisory Committee at Egenix, Inc. 2CED's Mid-Year Update to its Innovators Report Shows NC Startups Attracting Investment From Across the Globe with Several High-Profile Investment Deals, IPOs and Acquisitions Signaling Strength of Entrepreneurial Sector 2CED's Mid-Year Update to its Innovators Report Shows NC Startups Attracting Investment From Across the Globe with Several High-Profile Investment Deals, IPOs and Acquisitions Signaling Strength of Entrepreneurial Sector 3CED's Mid-Year Update to its Innovators Report Shows NC Startups Attracting Investment From Across the Globe with Several High-Profile Investment Deals, IPOs and Acquisitions Signaling Strength of Entrepreneurial Sector 4
... led by Governor Doyle and organized by Forward Wisconsin ... industrys leading conference with goals to establish new partnerships, ... community and to let others know that Wisconsin has ... group, the delegation met its objectives in spite of ...
... Medical Systems, a unit of General Electric Company, announced ... Food and Drug Administration to begin marketing its new ... Signa EXCITE 3.0T combines the increased speed and higher ... of imaging capabilities found on premium 1.5 Tesla systems. ...
... Insurance. Motorcycles? Computerworld has just released their ... 2003, and five Wisconsin companies have placed in the ... Inc. of Milwaukee. , ,This years list, with ... employees perspectives of working conditions and employment benefits. According ...
Cached Biology Technology:On site at BIO 2003 2On site at BIO 2003 3On site at BIO 2003 4On site at BIO 2003 5GE Medical Systems Receives FDA Clearance for New MRI System 2Wisconsin Companies Ranked Top in Nation in IT 2Wisconsin Companies Ranked Top in Nation in IT 3Wisconsin Companies Ranked Top in Nation in IT 4
Rad 50 Immunogen: c-terminal mRad 50 (604 amino acids). Storage: 4 C...
...
... Kit Includes: Sufficient library for ... x 10^9 independent sequences, -28 gIII ... DNA sequencing, -96 gIII Sequencing Primer ... Host E. coli strain ER2738, Control ...
... The CHEMICON Re-Blot Western Blot Recycling ... antibodies from Western blots that have ... iodine or other isotopes. It is ... (TMB, DAB, 4-chloronapthol, etc.), as it ...
Biology Products: