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:6/30/2017)... , June 30, 2017 Today, American ... and supplier of face and eye tracking software, ... Product provider program. "Artificial intelligence ... way to monitor a driver,s attentiveness levels while ... being able to detect fatigue and prevent potential ...
(Date:5/16/2017)... --  Bridge Patient Portal , an enterprise patient ... Systems , an electronic medical record solutions developer ... a partnership to build an interface between the ... products, including Centricity Practice Solution (CPS), Centricity Business ... integrations will allow healthcare delivery networks using GE ...
(Date:4/17/2017)... MELBOURNE, Florida , April 17, 2017 ... security technology company, announces the filing of its 2016 Annual Report ... Securities and Exchange Commission. ... Report on Form 10-K is available in the Investor Relations section ... well as on the SEC,s website at http://www.sec.gov . ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... 12, 2017 , ... They call it the “hairy ball.” ... depiction of a system of linkages and connections so complex and dense that ... computer science at Worcester Polytechnic Institute (WPI) and director of the university’s bioinformatics ...
(Date:10/12/2017)... ... 2017 , ... DuPont Pioneer and recently formed CasZyme, a ... a multiyear collaboration to identify and characterize novel CRISPR-Cas nucleases. The goal of ... across all applications. , Under the terms of the agreement, Pioneer will provide ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... with the addition of its newest module, US Hemostats & Sealants. , SmartTRAK’s ... hemostats, absorbable hemostats, fibrin sealants, synthetic sealants and biologic sealants used in surgical ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... the first-ever genomics analysis platform specifically designed for life science researchers to ... of pioneering researcher Rosalind Franklin, who made a major contribution to the ...
Breaking Biology Technology: