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Proceedings Paper

Mid-infrared absorption spectroscopy using quantum cascade lasers
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Paper Abstract

Block Engineering has developed an absorption spectroscopy system based on widely tunable Quantum Cascade Lasers (QCL). The QCL spectrometer rapidly cycles through a user-selected range in the mid-infrared spectrum, between 6 to 12 μm (1667 to 833 cm-1), to detect and identify substances on surfaces based on their absorption characteristics from a standoff distance of up to 2 feet with an eye-safe laser. It can also analyze vapors and liquids in a single device. For military applications, the QCL spectrometer has demonstrated trace explosive, chemical warfare agent (CWA), and toxic industrial chemical (TIC) detection and analysis. The QCL's higher power density enables measurements from diffuse and highly absorbing materials and substrates. Other advantages over Fourier Transform Infrared (FTIR) spectroscopy include portability, ruggedness, rapid analysis, and the ability to function from a distance through free space or a fiber optic probe. This paper will discuss the basic technology behind the system and the empirical data on various safety and security applications.

Paper Details

Date Published: 12 May 2011
PDF: 6 pages
Proc. SPIE 8032, Next-Generation Spectroscopic Technologies IV, 803208 (12 May 2011); doi: 10.1117/12.884523
Show Author Affiliations
Fred Haibach, Block Engineering, LLC (United States)
Adam Erlich, Block Engineering, LLC (United States)
Erik Deutsch, Block Engineering, LLC (United States)

Published in SPIE Proceedings Vol. 8032:
Next-Generation Spectroscopic Technologies IV
Mark A. Druy; Richard A. Crocombe, Editor(s)

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