Perrett, B, Harris, M, Pearson, GN, Willetts, DV and Pitter, MC 2003, 'Remote Photoacoustic Detection of Liquid Contamination of a Surface' , APPLIED OPTICS, 42 (24) , pp. 4901-4908.

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Abstract

A method for the remote detection and identification of liquid chemicals at ranges of tens of meters is presented. The technique uses pulsed indirect photoacoustic spectroscopy in the 10-μm wavelength region. Enhanced sensitivity is brought about by three main system developments: (1) increased laser-pulse energy (150 μJ/pulse), leading to increased strength of the generated photoacoustic signal; (2) increased microphone sensitivity and improved directionality by the use of a 60-cm-diameter parabolic dish; and (3) signal processing that allows improved discrimination of the signal from noise levels through prior knowledge of the pulse shape and pulse-repetition frequency. The practical aspects of applying the technique in a field environment are briefly examined, and possible applications of this technique are discussed.

Item Type:	Article
Themes:	Subjects / Themes > T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication (Inc. www, lidar, radio, radar, phone, TV) Subjects / Themes > Q Science > QC Physics > QC350-467 Optics. Light Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound Subjects outside of the University Themes
Schools:	Colleges and Schools > College of Science & Technology > School of the Built Environment
Journal or Publication Title:	APPLIED OPTICS
Publisher:	Optical Society of America
Refereed:	Yes
ISSN:	0003-6935
Depositing User:	H Kenna
Date Deposited:	09 Oct 2007 15:43
Last Modified:	27 Sep 2011 12:27
URI:	http://usir.salford.ac.uk/id/eprint/762

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