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:9/30/2014)... in German . ... expensive foods in the world. Because they grow underground, people ... distinctive smell of truffles is not only of interest to ... direction of the Goethe University Frankfurt have discovered that the ... which are trapped inside truffle fruiting bodies. , White truffles ...
(Date:9/30/2014)... to know what goes wrong with your muscles because of ... what "normal" actually is. That,s where a new research report ... FASEB Journal comes in. In the report, a ... molecules that can help scientists "see" which genes are active ... found never-before-detected gene activity and that men have approximately 400 ...
(Date:9/30/2014)... of perilous threats in today,s ocean. From overfishing ... fragile coral ecosystems are disappearing at unprecedented rates ... of corals surrounding the island of Moorea in ... tropical environment: coral guard-crabs. New research from the ... scientist Seabird McKeon and the museum,s predoctoral fellow ...
Breaking Biology News(10 mins):On the trail of the truffle flavor 2Scientists identify which genes are active in muscles of men and women 2Smithsonian scientists discover coral's best defender against an army of sea stars 2
... is the first handbook of its kind, introducing ... microcirculation. Clearly structured throughout, this book is ... on microcirculation imaging. , Author Professor Martin J. ... explores everything from basic research to medical applications. ...
... Bethesda, MD FASEB MARC (Maximizing Access to Research ... the 2012 Genetics Society of America (GSA) Yeast Genetics ... 31 August 5, 2012. These awards are ... postdoctorates and scientists into the mainstream of the basic ...
... from the fields of social, biological and medical science ... to discuss how they can cooperate to improve our ... influence how our genetic inheritance is expressed (epigenetics). This ... epigenetic changes have for such key social policy issues ...
Cached Biology News:World experts meet in Edinburgh to consider how life experiences impact on our genes 2
(Date:9/30/2014)... NEW YORK , Sept. 30, 2014 /PRNewswire/ ... trends and segments with highest potential revenues Do ... Visiongain,s updated report gives you revenue predictions for ... ahead. For those therapies you find financial data, ... new analysis you get sales forecasts to 2024 ...
(Date:9/30/2014)... 30, 2014 Nematicide is a type ... are microscopic parasitic roundworms, found in massive quantities ... plants and animals. Nematicides have tended to be ... promoting migration through the soil. A single gram ... nematodes. With more than 10,000 species classified, they ...
(Date:9/30/2014)... 30, 2014 Proove Biosciences , ... excited to announce a new genetic test built upon ... Pain Perception Test will provide physicians with an ... pain tolerance levels are stratified between individuals. With this ... a person has a genetic predisposition that will affect ...
(Date:9/30/2014)... , Sept. 30, 2014  RegeneRx Biopharmaceuticals, Inc. ... that it has received a Canadian Patent for ... Peptides.  This patent includes claims using thymosin beta ... actin-sequestering peptides for these purposes.  The patent will ... Biopharmaceuticals, Inc. ( www.regenerx.com ) ...
Breaking Biology Technology:Biosimilars and Follow-On Biologics: World Industry and Market Prospects 2014-2024 2Biosimilars and Follow-On Biologics: World Industry and Market Prospects 2014-2024 3Biosimilars and Follow-On Biologics: World Industry and Market Prospects 2014-2024 4Biosimilars and Follow-On Biologics: World Industry and Market Prospects 2014-2024 5Nematicides Market by Types (Fumigants, Organophosphates, Carbamate and Bio-Nematicides), Applications (Agrochemicals, Industrial, and Others), and Geography (North America, Europe, Asia-Pacific & ROW) - Global Trends & Forecasts to 2019 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 3RegeneRx Receives Canadian Patent for Inhibition or Reversal of Skin Aging 2
... , , , ... the world,s leading research and advisory firms focusing on pharmaceutical ... lost substantial patient share in second- and third-line therapy since ... is most likely attributed to the publication of the ENHANCE ...
... , EMERYVILLE, Calif., Aug. 12 Neurobiological Technologies, ... it has entered into an agreement to terminate its license ... Medical Center Corporation (CMCC). Pursuant to the termination of ... final payment to NTI in satisfaction of all its royalty ...
... ... and lost each month, though the average of new jobs in the industry remains at 20,000 ... the U.S. However, companies ancillary to health care, such as insurers, are feeling the economic pinch ... (Vocus) August 12, ...
Cached Biology Technology:Merck/Schering-Plough's Zetia and Vytorin Have Lost Substantial Patient Share in Second- and Third-Line Therapy Since Last Year's Analysis of Dyslipidemia 2Merck/Schering-Plough's Zetia and Vytorin Have Lost Substantial Patient Share in Second- and Third-Line Therapy Since Last Year's Analysis of Dyslipidemia 3Neurobiological Technologies Announces Termination of its License and Cooperation Agreement with Merz and Children's Medical Center 2The MedZilla Report for July, 2009 - Health Care Creates 20,000 More Jobs As Economy Hits Insurers 2The MedZilla Report for July, 2009 - Health Care Creates 20,000 More Jobs As Economy Hits Insurers 3The MedZilla Report for July, 2009 - Health Care Creates 20,000 More Jobs As Economy Hits Insurers 4
... is an aqueous-based mounting medium designed ... sections. Gel/Mount is especially recommended when ... or FluoroBlue. It can also be ... as fluorescein (FITC), Rhodamine (TMRITC) and ...
... - Fixation medium Reagent B - Permeabilisation ... fixing cells in suspension with Reagent A ... B. This procedure gives antibodies access to ... characteristics of the cells intact. Specific formulations ...
...
Collected from calves that are 10 days old or less. Sterile, cell culture tested, US Origin...
Biology Products: