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:8/21/2014)... 21, 2014 /PRNewswire-iReach/ -- LiveScan Service Provider  ... to a partnership with Gabriel Health Institute, one ... growing Certified Nursing Assistant preparatory schools. The ... exclusive member of Binary,s LiveScan service provider,s owner/operator ... improve its service capabilities by widening the ...
(Date:8/21/2014)... finding that has implications for life in other extreme ... solar system, LSU Associate Professor of Biological Sciences Brent ... Foundation, or NSF, this week published a paper confirming ... lies 800 meters (2600 feet) beneath the surface of ... Given that more than 400 subglacial lakes and numerous ...
(Date:8/21/2014)... to Wednesday, Oct. 18-22, 2014 , WHERE: ... Drive, San Diego, CA 92101 , WHAT: ... presentations of the latest research in human genetics. ... featuring high-scoring abstracts on rare genetic variants in ... and treatment for sun sensitivity (Saturday, Oct. 18, ...
Breaking Biology News(10 mins):LiveScan Provider Binary Biometrics Announces Partnership with Preeminent CNA School, Gabriel Health Institute to Expand Services in Orlando Region 2LiveScan Provider Binary Biometrics Announces Partnership with Preeminent CNA School, Gabriel Health Institute to Expand Services in Orlando Region 3800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 2800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 3800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 4American Society of Human Genetics 2014 Annual Meeting 2
... A potential new treatment for alcoholism called nalmefene ... alcohol dependent individuals, says a new study published this ... has been regarded as the primary treatment goal for ... approved only for relapse prevention. However, relapse rates remain ...
... unprecedented threat from climate change, overfishing, pollution, invasive ... researcher is helping coordinate national efforts to monitor ... for food, medicine, transportation and recreation, yet little ... 70 percent of the Earth,s surface are functioning ...
... bacteria that adhere to surfaces and build protective coatings ... pathogen Salmonella . One out of every six ... over a million illnesses caused by Salmonella bacteria, ... out what makes Salmonella resistant to antibacterial measures ...
Cached Biology News:A new treatment option for alcohol dependence: Reduced consumption rather than abstinence 2Scientists stress need for national marine biodiversity observation network 2Scientists stress need for national marine biodiversity observation network 3Biofilms help Salmonella survive hostile conditions, Virginia Tech researchers say 2
(Date:8/21/2014)... 21, 2014 OTC Markets Group ... a biotechnology company, on its approval to list ... on OTCQX®, the best marketplace for established U.S. ... Logo - http://photos.prnewswire.com/prnh/20110118/MM31963LOGO ... execution of its growth strategy and achievement of ...
(Date:8/21/2014)... Pursuit Solutions ( http://www.pursuit-solutions.com ), a ... for Life Sciences sales and marketing organizations, announced ... Commercial Sales Models” by Peter Robinson, co-founder and ... examines some innovative models used to improve sales ... the pharmaceutical market. Robinson grades the industry on ...
(Date:8/21/2014)... (PRWEB) August 21, 2014 ... has been recognized as one of the nation’s ... 5000 magazine for the 2nd consecutive year. Inc. ... 33rd annual Inc. 500|5000, an exclusive ranking of ... the most comprehensive look at the most important ...
(Date:8/20/2014)... licensed to biotechnology firms has revealed early bottlenecks ... roadblocks, the researchers suggest that better communication of ... lead to faster commercialization down the road. , ... in university laboratories and licensed to biotechnology firms. ... have a high failure rate. But a new ...
Breaking Biology Technology:OTC Markets Group Congratulates Immune Pharmaceuticals on NASDAQ Listing 2Pursuit's Peter Robinson Publishes "Grading Pharma's Use of New Commercial Sales Models" 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 3Early bottlenecks in developing biopharmaceutical products delay commercialization 2Early bottlenecks in developing biopharmaceutical products delay commercialization 3
... ... to holding a spring medical device package testing seminar in March of 2010 , ... Minneapolis, MN (PRWEB) February 2, 2010 ... testing , has confirmed that it will host a packaging seminar focused towards the medical ...
... , , , , , , ... Bioscience, a company,providing customized enzymes to the pharmaceutical, chemical, and other,industries, ... EUR 2,million from existing shareholders. , ... families to,its product portfolio and to accelerate the development of international,markets. ...
... ... 2 The biomedical industry is one of the most recession-resilient ... innovation, job growth and revenue that will help lead the state to ... Healthcare Institute (CHI) and PricewaterhouseCoopers LLP (PwC).  But, the report points ...
Cached Biology Technology:DDL to Host Spring Packaging Seminar 2EUCODIS Bioscience Receives EUR 2 Million Cash Injection to Enlarge Product Portfolio and Develop International Markets 2EUCODIS Bioscience Receives EUR 2 Million Cash Injection to Enlarge Product Portfolio and Develop International Markets 3Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 2Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 3Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 4Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 5Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 6Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 7Biomedical Industry Jobs Critical to California's Economic Recovery, Finds California Healthcare Institute and PricewaterhouseCoopers 8
...
... purification systems provide high speed purification of ... offer increased throughput and reproducible results. The ... mL and KingFisher 96, covering sample volumes ... consists of an instrument, specially designed plastics ...
Candida (IgA) -Ab EIA Sample Size: 5 l...
... Oxidized LDL (Competitive) EIA Principle: ... the monoclonal antibody 4E6. Oxidized LDL in the ... LDL bound to the microtiter well for the ... a washing st Sample Size: 25 ...
Biology Products: