Journal
ANALYTICAL CHEMISTRY
Volume 82, Issue 20, Pages 8412-8420Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac101109w
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Funding
- National Institute of Justice, Office of Justice, U.S. Department of Justice [2007-DN-BX-K199]
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We combine a thermal light source with a conventional thermal infrared camera, alternating current (AC) detection methods, and chemical filtering of the infrared (IR) light to generate several imaging modalities in a simple manner. We demonstrate that digital lock-in amplifier techniques can increase the chemical contrast in an active thermal infrared image using both reflectance and thermal re-emission. We show this method is useful for visualizing thin coatings on fabrics that are invisible to the eye. We also take advantage of a like-detects-like chemical filtering approach to chemical selectivity for the purpose of chemical identification using a broadband thermal detector.
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