Journal
APPLIED SPECTROSCOPY
Volume 72, Issue 4, Pages 634-642Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0003702817746696
Keywords
Mid-infrared spectroscopy; MIR; supercontinuum; SC; standoff detection; Fabry-Perot filter spectrometer
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Funding
- strategic economic and research program Innovative Upper Austria 2020'' of the province of Upper Austria
- European Union [722380]
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Mid-infrared (MIR) supercontinuum (SC) lasers are an attractive new option in the field of IR spectroscopy, especially for standoff detection. Supercontinuum radiation unites high brightness, high spatial coherence, and broadband spectral coverage, thereby surpassing thermal IR sources and challenging quantum cascade lasers. The employed SC source operates in the spectral region of 1.2- 4.6 mu m, filling the spectral gap where quantum cascade lasers lack broader availability. In this work, the SC radiation was recorded by compact Fabry-Perot filter spectrometers ideally suited for sensitive standoff detection with real- time capability. The noise performance of the setup and measurements of different substances at standoff distances are presented, e.g., of different paints on a metal surface and an explosive precursor. Furthermore, the real- time capability of the setup is demonstrated by monitoring the evaporation of liquid 2-propanol.
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