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

said. "That is ten thousand times smaller than the diameter of an atom."

One of the best ways to detect and accurately measure movements that small is by using lasers and mirrors, creating a sort of tiny light show inside the microphone.

Kilic ran a fiberoptic cable into the water-filled microphone, with the end of the cable positioned near the inside surface of the diaphragm. He then shot light from a laser out the end of the cable onto the diaphragm.

Normally a diaphragm so thin would be transparent, allowing the laser's light to escape. But the researchers knew that if the diameters of the holes that allowed water to pass through the diaphragm were close to the wavelength of the light from the laser, the holes would interfere with light trying to pass through the membrane. Instead of letting it pass, the holes would reflect the light back toward the tip of the fiber optic cable, effectively turning the diaphragm into a mirror even as it still allowed water to pass.

"It is counterintuitive, because we don't see this happen at our scale," Kilic said. "But at very small scales, with the right size holes drilled through the membrane, it works."

When the diaphragm is deformed ever so slightly by a sound wave, the intensity of the light reflected back into the cable is altered, which is measured with an optical detector.

Now the scientists had a hydrophone that would function at any depth and could detect and measure sound with extreme accuracy. But to be able to capture the full range of volumes they were after a spread of 160 decibels one diaphragm wasn't enough. So they used three.

By giving each one a different diameter, they were able to "tune" each diaphragm to maximize its sensitivity to a different part of the range of volumes they wanted to detect. One was tuned to measure quiet sounds on the library-whisper end of the spectrum, one was attuned more to the loud, TNT explosion end of the range, a
'/>"/>

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:5/7/2015)... 2015 Fingerprint Cards (FPC) ... FPC1035, FPC,s smallest touch fingerprint sensors to date.  ... for integration on the backside of the phone, ... possibilities to integrate touch fingerprint sensors in the ... possibilities for module manufacturers to customize the look ...
(Date:4/27/2015)... 2015  For more than four decades, AUVSI,s ... the premier worldwide event for the unmanned land, sea, ... event for any local, national, or trade news organization ... markets and current applications of unmanned technologies. The conference ... $48 billion industry, and how it will soon impact ...
(Date:4/21/2015)... April 21, 2015 High ... policies are boosting access control systems market in ... to a recently published report by TechSci Research " ... the access control systems market in Saudi ... by 2020.The access control systems market in the Kingdom ...
Breaking Biology News(10 mins):FPC Introduces its Smallest Touch Fingerprint Sensors to Date 2UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 2UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 3UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 4UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 5Saudi Arabia Access Control Systems Market to Touch USD1.2 Billion by 2020 Says TechSci Research 2Saudi Arabia Access Control Systems Market to Touch USD1.2 Billion by 2020 Says TechSci Research 3
... Dr. Ron Koder, assistant professor of physics at The City ... devised a novel method for producing an artificial protein capable ... recently awarded a three-year $1.3 million grant from the U.S. ... be administered to injured troops on the battlefield. "Engineered ...
... & Biotechnology News (GEN) recently co-sponsored a roundtable discussion ... in environment clean-up after manmade or natural disasters. "Gulf ... Impact and to Help in Remediation" was also sponsored ... of Massachusetts Boston, where the discussions took place. Part ...
... on hold until after 40, or even 45, will be ... there are associated risks for babies when postponing child-bearing, the ... Aviv University,s Sackler School of Medicine and the Hospital for ... in Israel, a country that supports in vitro fertilization (IVF) ...
Cached Biology News:CCNY professor gets grant to develop 'artificial blood' 2Rocking the cradle after 45 2
(Date:5/28/2015)...  Quest Diagnostics Incorporated (NYSE: DGX ), the ... it is scheduled to speak at the Jefferies 2015 ... , the company,s President and CEO, will discuss the ... is scheduled for Tuesday, June 2, 2015 at 8:00 ... webcast live during the conference and will be available ...
(Date:5/28/2015)... -- Research and Markets( http://www.researchandmarkets.com/research/3nl6s2/neuroprotection ) has announced ... "Neuroprotection - Drugs, Markets and Companies" to ... role of neuroprotection in acute disorders such as ... well as in chronic diseases such as neurodegenerative ... damage to neural tissues are similar in all ...
(Date:5/28/2015)... 2015 BioNorth Texas (BioNorthTX), an ... the life sciences industry in northern region of ... at The Foundry in Dallas on April 27, ... together a broad spectrum of biotech professionals from ... early successes in partnering with key life sciences ...
(Date:5/28/2015)... and London (PRWEB) May 28, 2015 ... of Computer Aided Engineering software, announced today it ... Inc. (PSRI). CD-adapco will provide state-of-the-art engineering simulation ... will share their expertise and experiences in analyzing ... refining industry members and advance the understanding of ...
Breaking Biology Technology:Quest Diagnostics to Speak at the Jefferies 2015 Global Healthcare Conference 2Global Neuroprotection Market Report 2015-2024 - Drugs, Markets and Companies 2Global Neuroprotection Market Report 2015-2024 - Drugs, Markets and Companies 3BioNorthTX Holds Inaugural Board of Directors Meeting 2BioNorthTX Holds Inaugural Board of Directors Meeting 3CD-adapco and PSRI Chartering New Course in Particle Flow Simulations 2
... Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 -- AMSTERDAM, The Netherlands, August 31, 2010 ... ... --> ... function(data) { var s = ,; var first_result; // Results are keyed by longUrl, so we ...
... 21st Century Biochemicals, Inc . of Marlborough, ... ranking of the 5,000 fastest-growing private companies in the country ... Century Biochemicals was ranked #2626 after being ranked #575 in ... comprehensive look at the most important segment of the economy ...
... NEW YORK, Aug. 30 Rx Communications Group, LLC today ... will preside over the Closing Bell ceremony on Wednesday, September ... to commemorate the firm,s tenth year anniversary of providing award-winning ... A live webcast of the Closing Bell ceremony will ...
Cached Biology Technology:Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 2Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 3Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 4Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 5Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 6Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 7Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 8Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 9Amsterdam Molecular Therapeutics Reports Half-Year Results 2010 1021st Century Biochemicals Marks Its Third Consecutive Year on the Inc. 5000 2Rx Communications Group to Ring NASDAQ Closing Bell 2
Vented Caps for 75 cm2 Flasks...
BD BioCoat Poly-D-Lysine 60 mm Culture Dishes, tissue-culture treated polystyrene with a uniform application of poly-D-lysine....
BD BioCoat Laminin 60 mm Culture Dishes, tissue-culture treated polystyrene with a uniform application of mouse laminin....
... Series 4000 incorporates the critical design features ... in biomarker research. The Series 4000 delivers ... converting biomarker discoveries to biomarker assays all ... is designed to fit into the research ...
Biology Products: