Navigation Links
The inaudible symphony analyzed
Date:11/3/2008

By measuring 'inaudible' sounds, events like illegal nuclear tests can be detected. This 'infrasound' can also help us understand more about the upper atmosphere, according to Lslo Evers. Evers will receive a PhD based on his research into this subject at Delft University of Technology (TU Delft) on Tuesday 4 November 2008.

Sound with a frequency below 20 Hz is inaudible to human ears. Scientists' ears, however, are very interested in this 'infrasound'. Sources of infrasound are often large and powerful, like meteors, explosions, ocean waves, storms, volcanoes, avalanches, earthquakes and nuclear tests.

Infrasound is measured with arrays (series) of highly sensitive microbarometers. TU Delft PhD student Lslo Evers, who works at the Royal Netherlands Meteorological Institute (KNMI), has improved the entire process of measuring, analysing and interpreting infrasound. The big challenge is to separate sounds from one other and to identify their sources.

Nuclear Test Ban Treaty

Large explosions in the vicinity are easy to recognise, for example the explosion of a fuel depot near London in 2005. At home, Evers saw a huge peak above the noise on his computer screen. He knew immediately that something big had happened in England.

But the main purpose of his work is the detection of above-ground nuclear tests. KNMI helps to enforce the Comprehensive Nuclear Test Ban Treaty of 1996, which prohibits signatories from testing nuclear devices. Dozens of microbarometers have been set up on five sites in the Netherlands.

More research

To further refine the analyses, we need to know more about the interaction between the earth's atmosphere and infrasound. The temperatures and wind speeds at an altitude of fifty to a hundred kilometres can cause distortion.

This analysis process can also be turned around. Evers wants to use information gleaned from infrasound to map the upper atmosphere more accurately. He is planning to conduct research in this field together with the Department of Acoustic Remote Sensing of the Faculty of Aerospace Engineering at TU Delft.


'/>"/>

Contact: Roy Meijer
r.e.t.meijer@tudelft.nl
31-302-781-751
Delft University of Technology
Source:Eurekalert

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/24/2017)... -- Janice Kephart , former 9/11 Commission ... LLP (IdSP) , today issues the following statement: ... 6, 2017 Executive Order: Protecting the Nation ... instilled with greater confidence, enabling the reactivation of ... are suspended by until at least July 2017). ...
(Date:4/18/2017)... 2017  Socionext Inc., a global expert in SoC-based imaging and ... the M820, which features the company,s hybrid codec technology. A demonstration ... Probe, Inc., will be showcased during the upcoming Medtec Japan at ... the Las Vegas Convention Center April 24-27. ... Click here for an ...
(Date:4/13/2017)... , April 13, 2017 UBM,s Advanced ... will feature emerging and evolving technology through ... Innovation Summits will run alongside the expo portion of ... sessions, panels and demonstrations focused on trending topics within ... advanced design and manufacturing event will take place June ...
Breaking Biology News(10 mins):
(Date:7/18/2017)... ... July 18, 2017 , ... ... that Merck, a leading science and technology company, has implemented Genedata Biologics ... the therapeutic areas of Oncology, Immunology, and Neurodegenerative Diseases. , The need to ...
(Date:7/17/2017)... ... July 17, 2017 , ... Whitehouse Laboratories is excited to ... the full series of ISO 80369 standard test procedures. The ISO 80369 series ... drug delivery systems. With this recent expansion, Whitehouse Labs becomes one of the ...
(Date:7/17/2017)... ... July 17, 2017 , ... Panitch Schwarze Belisario ... in the BiG (Biomedical Innovation Group) annual meeting in China. , This year’s ... antigen receptor T-cell) therapy, a rapidly developing highly personalized anti-cancer technology that involves ...
(Date:7/15/2017)... Island, NY (PRWEB) , ... July 15, 2017 , ... ... for over 5 years. During this time, the people at FFS have learned ... from their customers, engineers at FFS are able to launch new products to meet ...
Breaking Biology Technology: