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An ultrasonic wave-front with propagation direction dependent frequency
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Palmer, Stuart B., Hill, Steven M. (Mark), Rowlands, G. (George) and Dixon, S. (2013) An ultrasonic wave-front with propagation direction dependent frequency. In: Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, San Diego, USA, 10 Mar 2013. Published in: SPIE Proceedings, Volume 8694 Article number 86941S. ISSN 0277-786X. doi:10.1117/12.2014314
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Official URL: http://dx.doi.org/10.1117/12.2014314
Abstract
The use of phased array methods are commonplace in ultrasonic applications, where controlling the variation of the phase between the narrowband emitters in an array facilitates beam steering and focusing. An approach is presented here, whereby all emitters in a 1 dimensional array are pulsed simultaneously, with a controlled bandwidth to emit a 2 dimensional wave. The key result is that one can generate a smooth, continuous wave-front emitted from the array, over a large solid angle, whose frequency varies as a function of angle to the array. Analytic and finite element models created to simulate this phenomena have been validated with experimental results using ultrasonic waves in metal samples. This pulsed approach provides a rapid means of flooding a region of space with a wave-front, whereby any wave that scatters or reflects off a body to a detector will have a distinct arrival time and frequency. This is a general wave phenomena with potential applications in radar, sonar and ultrasound.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics Administration > Vice Chancellor's Office |
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| Journal or Publication Title: | SPIE Proceedings | ||||
| ISSN: | 0277-786X | ||||
| Book Title: | Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013 | ||||
| Official Date: | 26 April 2013 | ||||
| Dates: |
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| Volume: | Volume 8694 | ||||
| Page Range: | Article number 86941S | ||||
| DOI: | 10.1117/12.2014314 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013 | ||||
| Type of Event: | Conference | ||||
| Location of Event: | San Diego, USA | ||||
| Date(s) of Event: | 10 Mar 2013 |
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