Share Email Print
cover

Proceedings Paper

Active hyperspectral imaging system for the detection of liquids
Author(s): Chris R. Howle; David J. M. Stothard; Cameron F. Rae; Mark Ross; Ben S. Truscott; Christopher D. Dyer; Malcolm H. Dunn
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The in situ location and identification of discrete liquid droplets on surfaces is a technically challenging problem. Successful solutions often combine real time imaging and optical spectroscopic techniques. To this end, we present results of initial experiments using a dual-band mid- and shortwave IR (1.3 - 4.5 μm) imaging device to differentiate between a selection of mineral and synthetic oils. The illumination source is an optical parametric oscillator comprising a periodically-poled LiNbO3 crystal internally pumped by a Nd:YVO4 laser, which is pumped by a 3 W diode laser. The source can produce output powers of ca. 0.3 and 0.1 W in the signal and idler fields, respectively. System size and complexity are minimised by use of an MCT single element detector and images are acquired by raster scanning of the target. The reflection, absorption and/or scatter of the incident radiation by the liquids and their surroundings provide a method for spatial location, whereas the characteristic spectra obtained from each sample can be used to uniquely identify the deposited substance. Both static and video images can be obtained at a range of < 10 metres by this apparatus.

Paper Details

Date Published: 17 April 2008
PDF: 12 pages
Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 69540L (17 April 2008); doi: 10.1117/12.787452
Show Author Affiliations
Chris R. Howle, Defence Science and Technology Lab. (United Kingdom)
David J. M. Stothard, Univ. of St. Andrews (United Kingdom)
Cameron F. Rae, Univ. of St. Andrews (United Kingdom)
Mark Ross, Univ. of St. Andrews (United Kingdom)
Ben S. Truscott, Defence Science and Technology Lab. (United Kingdom)
Christopher D. Dyer, Defence Science and Technology Lab. (United Kingdom)
Malcolm H. Dunn, Univ. of St. Andrews (United Kingdom)


Published in SPIE Proceedings Vol. 6954:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX
Augustus Way Fountain; Patrick J. Gardner, Editor(s)

© SPIE. Terms of Use
Back to Top