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:7/11/2014)... 2014 Researchers have pioneered a revolutionary new ... technology, called Virtual Finger, allows scientists to move ... and synapses using the flat surface of their ... imaging studies orders of magnitude more efficient, saving ... across many areas of experimental biology. The software ...
(Date:7/11/2014)... type 1 can inhibit voltage-gated calcium channel, ... release. However, some scholars demonstrated that cannabinoid ... influx and increase neurotransmitter release. Dr. Yi ... to Tongji Medical College, Huazhong University of ... voltage-clamp and calcium imaging in cultured trigeminal ...
(Date:7/10/2014)... , June 27, 2014  The American Academy ... Institute of Standards and Technology (NIST) and the ... academic research and forensic science expert members to ... is an element of the NIST,s Organization of ... among the first appointments made to the new ...
Breaking Biology News(10 mins):Virtual finger enables scientists to navigate and analyze complex 3D images 2Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 2Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 3
... Ore. -- New research has found that if you want ... or other cruciferous vegetables, you need to eat the real ... absorbed and of far less value if taken as a ... Pauling Institute at Oregon State University, is one of the ...
... has awarded UC Santa Barbara up to $15 million ... shape the future of technology in areas that will ... educate future scientists and engineers and advance the discovery ... novel polymers to next-generation microelectronics. The pioneering institute ...
... them, and although they could be effective in theory, antivirulence ... to be published in the online journal mBio ... to fight infection while avoiding the pitfalls of drug resistance. ... growth of pathogens, but antivirulence drugs prevent disease by ...
Cached Biology News:Health benefits of broccoli require the whole food, not supplements 2Health benefits of broccoli require the whole food, not supplements 3UCSB awarded $15 million by Dow to establish collaborative institute for materials research and education 2UCSB awarded $15 million by Dow to establish collaborative institute for materials research and education 3Can antivirulence drugs stop infections without causing resistance? 2
(Date:7/11/2014)... Cayenne Medical, Inc., a privately held ... tissue reconstruction segment, announced the worldwide launch of ... the shoulder and extremities. The SureLock System provides ... method. The unique delivery eliminates manual tensioning that ... anchor displacement (also commonly know as anchor “creep”). ...
(Date:7/10/2014)... (PRWEB) July 10, 2014 Understanding the ... channel-expressing cell lines, and the gap that currently exists ... that expand its industry-leading portfolio of validated ion channel ... ion channel-expressing cell lines, as ion channels control many ... control this activity creates the potential to treat a ...
(Date:7/10/2014)... Los Angeles, CA (PRWEB) July 10, 2014 ... Analytical and Bioanalytical techniques during 18-20 August, 2014 at ... to critically review the recent developments in Analytical & ... across the globe. , Speaking on this occasion, Dr. ... that Analytica Acta conference is a remarkable one ...
(Date:7/10/2014)... July 10, 2014 On July ... Medvedev , presented Russia,s first ... . The Company is developing a unique project called ... BIOCAD develops a number of innovative drugs based on ... The ceremony took place at the International Exhibition "Innoprom ...
Breaking Biology Technology:Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 3Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 2Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 3A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2
... a bioMerieux company that develops innovative oncology diagnostic tests ... from a clinical study evaluating the company,s Breast Cancer ... the study were presented at the 33rd Annual CTRC-AACR ... The company also announced that the Breast Cancer Index ...
... 2010 Pfizer Inc. (NYSE: PFE ) ... it is voluntarily withdrawing Thelin® (sitaxentan) for the treatment ... is approved (the European Union, Canada and Australia).  In ... (Logo: http://photos.prnewswire.com/prnh/20100416/PFIZERLOGO) Pfizer,s decision ...
... (Dec. 9, 2010) -- Nanotechnologists, marine biologists and signal-processing ... Woods Hole, Mass., and other U.S. universities have won ... Research to unlock the secrets of nature,s best camouflage ... emulate some of the elegant skin colors and patterns ...
Cached Biology Technology:bioTheranostics' Breast Cancer Index(SM) Predicts Risk for Late Recurrence in Early Stage ER-Positive Breast Cancer Patients 2bioTheranostics' Breast Cancer Index(SM) Predicts Risk for Late Recurrence in Early Stage ER-Positive Breast Cancer Patients 3Pfizer Stops Clinical Trials of Thelin® and Initiates Voluntary Product Withdrawal in the Interest of Patient Safety 2Pfizer Stops Clinical Trials of Thelin® and Initiates Voluntary Product Withdrawal in the Interest of Patient Safety 3Nano squid skin: DOD awards $6M for metamaterials research 2Nano squid skin: DOD awards $6M for metamaterials research 3
Request Info...
... Enzyme concentration - 5 units/µL ,• High ... yields ,• Leaves an 'A' overhang ... polymerase which exhibits very high activity in ... To ensure the quality of the enzyme, ...
... 5 units/µL ,• High specific activity and ... an 'A' overhang ,• Processes ... high activity in primer extension and other ... of the enzyme, each lot has been ...
... Gold® DNA Polymerase is a chemically modified ... chemical moiety is attached to the enzyme, ... the first ramp of thermal cycling (when ... temperatures), the enzyme is inactive. The result ...
Biology Products: