Low frequency acoustics phenomena in both air and in the ocean, and vibration or seismic activity in the ground or seabed, are used to detect major natural events such as earthquakes, tsunamis and volcanic activity. These technologies are also used to check compliance with the Comprehensive Nuclear-Test-Ban Treaty, using a global network of sound and vibration sensors together with radio-nuclear sensing, forming the International Monitoring System. However, the majority of the frequencies used for this kind of sound and vibration monitoring are not covered by current measurement standards, limiting the reliability of data obtained. Monitoring stations are also often located in extreme environments posing additional challenges for assuring the accuracy of the sensors.
The Infra-AUV project seeks to increase the capability to measure and calibrate at infra-sound frequencies, and to be able to develop methods to calibrate measurement stations in-situ using expertise from a number of different European NMIs (national measurement institutes) over the course of three years.
The UK’s National Physical Laboratory is focused on the underwater aspect of this project, and this talk seeks to describe the progress of the project so far and what is next.
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Topics and speakers for the evening meetings are generally identified and organised by the London Branch Committee, but we always welcome new ideas and suggestions for future presentations. If you have any ideas or suggestions, or may even like to give a presentation yourself, please contact the London Branch Committee Chair Roslyn Andrews. Roslyn.Andrews@aecom.com