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Proceedings Paper

Photo-vibrational spectroscopy using quantum cascade laser and laser Doppler vibrometer
Author(s): Huan Liu; Qi Hu; Jiecheng Xie; Yu Fu
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Paper Abstract

Photoacoustic/photothermal spectroscopy is an established technique for detection of chemicals and explosives. However, prior sample preparation is required and the analysis is conducted in a sealed space with a high-sensitivity sensor coupled with a lock-in amplifier, limiting the technique to applications in a controllable laboratory environment. Hence, this technique may not be suitable for defense and security applications where the detection of explosives or hazardous chemicals is required in an open environment at a safe standoff distance. In this study, chemicals in various forms were excited by an intensity-modulated quantum cascade laser (QCL), while a laser Doppler vibrometer (LDV) was applied to detect the vibration signal resulting from the photocoustic/photothermal effect. The photo-vibrational spectrum obtained by scanning the QCL’s wavelength in MIR range, coincides well with the corresponding spectrum obtained using typical FTIR equipment. The experiment in short and long standoff distances demonstrated that the LDV is a capable sensor for chemical detection in an open environment.

Paper Details

Date Published: 26 June 2017
PDF: 6 pages
Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 1032912 (26 June 2017); doi: 10.1117/12.2269684
Show Author Affiliations
Huan Liu, Nanyang Technological Univ. (Singapore)
Qi Hu, Nanyang Technological Univ. (Singapore)
Univ. of Shanghai for Science and Technology (China)
Jiecheng Xie, Nanyang Technological Univ. (Singapore)
Yu Fu, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 10329:
Optical Measurement Systems for Industrial Inspection X
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves, Editor(s)

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