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:9/2/2014)... may have discovered a new way of harnessing lupus ... DNA repair. , The findings were published recently in ... study, led by James E. Hansen, M.D., assistant professor ... that cancer cells with deficient DNA repair mechanisms (or ... significantly more vulnerable to attack by lupus antibodies. , ...
(Date:9/2/2014)... true that digital distribution of media will have ... at least when file sizes are large. , ... Yale,s Journal of Industrial Ecology that ... consoles such as PlayStation3. Researchers found that Blu-ray ... gas emissions than game files downloaded over broadband ...
(Date:9/2/2014)... 2, 2014 In a new study that could ... Florida campus of The Scripps Research Institute (TSRI) have ... unique manufacturing sites for molecules that can treat a ... as a reaction vessel and a disease-causing defect as ... cell," said TSRI Professor Matthew Disney.,"Because the treatment is ...
Breaking Biology News(10 mins):Sabotage as therapy: Aiming lupus antibodies at vulnerable cancer cells 2Scripps Florida scientists make diseased cells synthesize their own drug 2
... theoretical price of having one's personal genome sequenced just ... $2.2 million, and the goal is to reduce the ... realistic. , The sharp drop is due to a ... (HMS) researchers Jay Shendure, Gregory Porreca, George Church, and ...
... form of a powerful painkiller for a quick and dangerous ... alarm as the number of people dying from an overdose ... than morphine, rises. , Addicts are misusing a clear patch ... into the bloodstream over the course of a few days, ...
... with a Global Information System will provide valuable information ... National Institute of Environmental Health Sciences (NIEHS), one of ... provide the most up-to-date data to public health and ... industry maps, as well as demographic information for local ...
Cached Biology News:A step toward the $1,000 personal genome using readily available lab equipment 2Prescription pain patch abuse blamed for increase in deaths 2Prescription pain patch abuse blamed for increase in deaths 3FDA approves child-friendly AIDS medicine 2
(Date:9/2/2014)... a meter in size, are around us every day. ... as in some innovative early cancer treatments, but they ... traffic emissions, cosmetics, sunscreen and electronics. , A team ... by Lan Yang, PhD, the Das Family Career Development ... collaborators at Tsinghua University in China have developed a ...
(Date:9/2/2014)... Press attending the Project LIBERTY Grand ... of the people and events in Emmetsburg on Sept. ... throughout the day. Additionally, we will do our best ... representatives as well as representatives from the local community. ... , Please remember to RSVP to Matt Merritt (matt.merritt@poetdsm.com) ...
(Date:9/2/2014)... , Sept. 2, 2014  Technology Applications International Corporation ... its wholly-owned subsidiary Renuell Int,l, Inc. has signed an ... Space Administration ("NASA") at the Johnson Space Center in ... See photos: tapplic.com/houstonphotos/ ... very pleased to announce our latest, exclusive agreement with ...
(Date:9/2/2014)... Sept. 2, 2014 Orexigen Therapeutics, Inc. (Nasdaq: ... Patent and Trademark Office (PTO) has issued a patent ... for weight loss. NB32 is a fixed-dose combination of ... U.S. Patent No. 8,815,889 claims methods for treating insulin ... patent expires in 2024. If NB32 is approved for ...
Breaking Biology Technology:Engineers develop new sensor to detect tiny individual nanoparticles 2Engineers develop new sensor to detect tiny individual nanoparticles 3Press agenda for Project LIBERTY Grand Opening 2Press agenda for Project LIBERTY Grand Opening 3Press agenda for Project LIBERTY Grand Opening 4Press agenda for Project LIBERTY Grand Opening 5Technology Applications International Corporation Subsidiary Enters Into Additional Exclusive Agreement with NASA at a Signing Ceremony at the Johnson Space Center In Houston, Texas 2Technology Applications International Corporation Subsidiary Enters Into Additional Exclusive Agreement with NASA at a Signing Ceremony at the Johnson Space Center In Houston, Texas 3Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 2Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 3Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 4
... 13 Proteon Therapeutics is,presenting new data ... potential of PRT-201 to enhance outcomes in ... (PAD). The,presentation, entitled, "Local Catheter-Directed Elastase Therapy: ... is being made at the 20th,annual Transcatheter ...
... CLARA, Calif., Oct. 13 WebLOQ, Inc., ... secure and compliant eBusiness and,data-in-motion communications, today ... the WebLOQ ePrivacy solution in their state-of-the-art,Monterey ... partner, the,Monterey Peninsula Surgery Center, and other ...
... SYDNEY, Australia, Oct. 13 /Xinhua-PRNewswire-FirstCall/ -- Pharmaxis,Ltd (AXS: ... Quarterly,Report to Shareholders on the afternoon of Wednesday ... teleconference the following morning to,review the quarter and ... on Thursday 16th October at 8.30am (Sydney),(Wednesday 15th ...
Cached Biology Technology:Proteon Therapeutics to Present New Data on PRT-201 at Transcatheter Cardiovascular Therapeutics (TCT) Annual Symposium in Washington, D.C., October 13, 2008 2Monterey Spine and Joint Deploys WebLOQ ePrivacy Solution for HIPAA Compliant Health Information Exchange 2Monterey Spine and Joint Deploys WebLOQ ePrivacy Solution for HIPAA Compliant Health Information Exchange 3
... High-throughput protein crystallography involves using many ... Screening (HTS). The liquid handling requirements are ... volume: traditional crystallography plates have 24 or ... of microliters. For higher throughput, the number ...
... Description: ,Kit containing Dermal Fibroblasts (Mouse/BalbC) ... as a long-term culture, and is guaranteed ... continuous growth from the date supplied, when ... Dermis, mouse/BalbC, embryonic day 18.5 ,Applications: ...
... designed for protein pull-down experiments ... binding proteins. An order of ... agarose beads with 10 nmol ... terminus of the alkyl chain; ...
Rabbit polyclonal to Staphylococcus Enterotoxin A (HRP) ( Abpromise for all tested applications)....
Biology Products: