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:4/4/2017)... NEW YORK , April 4, 2017   ... solutions, today announced that the United States Patent and ... The patent broadly covers the linking of an iris ... the same transaction) and represents the company,s 45 th ... our latest patent is very timely given the multi-modal ...
(Date:3/30/2017)... , March 30, 2017 Trends, opportunities ... (physiological and behavioral), by technology (fingerprint, AFIS, iris recognition, ... recognition, and others), by end use industry (government and ... immigration, financial and banking, and others), and by region ... , Asia Pacific , and ...
(Date:3/24/2017)... MILAN , March 24, 2017 The Controller ... Deputy Controller Mr. Abdulla Algeen have received the prestigious international ... Continue Reading ... ... small picture) and Deputy Controller Abdulla Algeen (small picture on the right) ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ca (PRWEB) , ... October 12, 2017 , ... ... the Surgical Wound Market with the addition of its newest module, US Hemostats ... $1.2B market for thrombin hemostats, absorbable hemostats, fibrin sealants, synthetic sealants and biologic ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... in its endogenous context, enabling overexpression experiments and avoiding the use of exogenous ... RNA guides is transformative for performing systematic gain-of-function studies. , This complement ...
(Date:10/11/2017)... BioMarketing, a leading provider of patient support solutions, has announced ... network, which will launch this week. The VMS CNEs will ... to enhance the patient care experience by delivering peer-to-peer education ... professionals to help women who have been diagnosed and are ... ...
(Date:10/11/2017)... ... October 11, 2017 , ... Singh ... orphan drug designation to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of ... SBT-100 is able to cross the cell membrane and bind intracellular STAT3 and ...
Breaking Biology Technology: