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Proceedings Paper

Empirical testing procedure to determine chemical pollutant detection limits for a new thermal imaging Fourier transform spectrometer
Author(s): Tim Bubner; Mark Burridge; Shaun Frost
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Paper Abstract

The DSTO is currently developing an imaging Fourier Transform Infrared (FTIR) spectrometer for a variety of thermal signature measurements, passive remote sensing and spectroscopic applications. The proposed system is based on a commercial FTIR spectrometer and employs an 8x8 Cadmium Mercury Telluride (CMT) detector array and customised imaging optics. With this system expected to fulfil surveillance roles including passive pollution and target detection activities, an empirical procedure to determine the sensitivity and limits of such detections is required. This paper presents experimental measurements conducted at DSTO aimed at identifying these detection limits. A Bomem MR254 FTIR spectrometer fitted with a single element CMT detector was employed for these studies with the results feeding into the development phase of the imaging system. The approach outlined employs a polymer film and a common industrial solvent as reference materials. Both polymer and solvent exhibit strong infrared absorption features useful for diagnostic purposes. A simple Target to Clutter Ratio Square (TCR 2 ), 'likelihood ratio detection' and Receiver Operator Characteristic (ROC) curve analysis was employed to test the detection performance achievable for selected horizontal path ranges and temperature differentials. From this, indicative guidelines can be deduced for the limits of detection of the reference materials, for the system.

Paper Details

Date Published: 24 June 2002
PDF: 7 pages
Proc. SPIE 4722, Chemical and Biological Sensing III, (24 June 2002); doi: 10.1117/12.472256
Show Author Affiliations
Tim Bubner, Defence Science and Technology Organisation (Australia)
Mark Burridge, Defence Science and Technology Organisation (Australia)
Shaun Frost, Defence Science and Technology Organisation (Australia)

Published in SPIE Proceedings Vol. 4722:
Chemical and Biological Sensing III
Patrick J. Gardner, Editor(s)

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