Development of a photo-acoustic trace gas sensor
Paper
Paper/Presentation Title | Development of a photo-acoustic trace gas sensor |
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Presentation Type | Paper |
Authors | Kelly, C. (Author), Leis, J. (Author) and Buttsworth, D. (Author) |
Editors | Mee, David J. and Hillock, Ian D. M. |
Journal or Proceedings Title | Proceedings of the Conference of the Australian Acoustical Society (AAS 2011) |
ERA Conference ID | 42392 |
Number of Pages | 8 |
Year | 2011 |
Publisher | Australian Acoustical Society |
Place of Publication | Australia |
ISBN | 9780975785584 |
Web Address (URL) of Paper | https://www.acoustics.asn.au/conference_proceedings/AAS2011/papers/p139.pdf |
Web Address (URL) of Conference Proceedings | https://www.acoustics.asn.au/conference_proceedings/AAS2011/index.htm |
Conference/Event | 2011 Conference of the Australian Acoustical Society (Acoustics 2011): Breaking New Ground |
Annual Conference of the Australian Acoustical Society | |
Event Details | Annual Conference of the Australian Acoustical Society Acoustics Rank A A A A A A A A A A A |
Event Details | 2011 Conference of the Australian Acoustical Society (Acoustics 2011): Breaking New Ground Parent Annual Conference of the Australian Acoustical Society Delivery In person Event Date 02 to end of 04 Nov 2011 Event Location Gold Coast, Australia |
Abstract | The work presented in this paper addresses the problem of creating a low-cost, intrinsically safe, low-level gas sensor for mining and transportation applications. The system is to have no electrical connection to the remote sensor head, and as such relies on optical transmission via fibre. An integral component is the acoustically resonant chamber, which is excited by an appropriate laser excitation. The laser is modulated at the resonant frequency of the chamber to create a periodic heating and cooling, which translates into a periodic pressure wave. The pressure wave is amplified in the resonant chamber, and then measured using an optical microphone approach. This makes the sensor implicitly safe, as there are no electronics at the sensor head nor electrical connections required. A particular challenge associated with this approach is the acoustic signal generation and extraction from very high levels of noise. This paper gives a background on the photoacoustic method, and describes our approaches to the development of physical hardware and processing algorithms required for an embedded sensor. |
Keywords | photo-acoustics; acoustics; signal processing; physics |
ANZSRC Field of Research 2020 | 400909. Photonic and electro-optical devices, sensors and systems (excl. communications) |
400999. Electronics, sensors and digital hardware not elsewhere classified | |
510301. Acoustics and acoustical devices; waves | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Department of Electrical, Electronic and Computer Engineering |
Faculty of Engineering and Surveying | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q0x3v/development-of-a-photo-acoustic-trace-gas-sensor
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