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Industrial Session Abstracts 4 Monday, 13 March 2006
A Reference Vessel for Acoustic Cavitation: Initial Characterisation of the Spatial Distribution of Cavitation Activity Derived Using an Acoustic Emission Sensor
Bajram Zeqiri Acoustics Team Quality of Life Division National Physical Laboratory Tedington, Middlesex, United Kingdom.
Acoustic cavitation provides the driving force behind many industrial and medical applications, where the aim is to bring about irreversible changes in the bulk or surface properties of a material. Industrial examples include cleaning, materials processing and, in medicine, shock-wave lithotripsy and high-intensity focused ultrasound fields. Developing characterisation methods for the degree of cavitation being applied has proved to be remarkably difficult, due to complexity of the environments and the hostile nature of the applied fields. This presentation describes a programme of work carried out at the UK National Standards laboratory, NPL, to investigate suitable methods.
In particular, it will describe a system being established as a reference cavitating environment of known and repeatable properties, sufficiently well described for it to act as a test bed for various monitoring techniques: erosion, light emission, chemical and acoustic emission. This reference facility consists of a cylindrical reactor of thirty transducers operating at 25 kHz and generating 1.8 kW. Measurements of the spatial variation of cavitation activity made in the vessel using the NPL cavitation sensor, a broadband sensor detecting emissions up to 10 MHz, will be presented. Various aspects of NPL’s work in this area will be described: development of electronic instrumentation for the sensors, industrial trialling of the new technology within the UK and collaborations with universities to understand and exploit the potential of the acoustic emission method of cavitation detection.
He joined NPL in 1984 after completing a PhD in solid-state chemistry at the University of Kent at Canterbury. Over the years, he has been involved in a range of technical areas relating to the development of ultrasonic measurement techniques and standards. This includes: determination of the acoustic properties of materials, calibration and the use of ultrasonic hydrophones, characterisation of ultrasonic power and developing standards for physiotherapy equipment. Within the last five years, his major area of research interest has been in developing methods to characterise the essential properties of high power ultrasonic systems as used within the cleaning industry. Currently the Technology Head for Medical and Industrial Ultrasonics at NPL, he is a member of IEC Technical Committee 87, contributing to Working Groups 6,8 and 3. He is also Knowledge Leader for the Acoustics Team at NPL, having responsibility for the strategy and quality of the Acoustics Team at NPL over its three technical areas: Sound-in-Air, Underwater Acoustics and Medical and Industrial Ultrasound.
Rock Sampling Using the Ultrasonic/Sonic Driller/Corer (USDC) for In-situ Planetary Exploration
Xiaoqi Bao, Yoseph Bar-Cohen, Zensheu Chang, Stewart Sherrit and Mircea Badescu
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-80991
Future NASA exploration missions to Mars, Europa, Titan, comets and asteroids are seeking to
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