Photoacoustic spectroscopy (PAS) system for remote detection of explosives, chemicals, and special nuclear materials

Hual-Te Chien; Ke Wang; Shuh-Haw Sheen; A. C. Paul Raptis

doi:10.1117/12.919351

9 May 2012 Photoacoustic spectroscopy (PAS) system for remote detection of explosives, chemicals, and special nuclear materials

Hual-Te Chien, Ke Wang, Shuh-Haw Sheen, A. C. Paul Raptis

Author Affiliations +

Proceedings Volume 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII; 83581K (2012) https://doi.org/10.1117/12.919351
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

This paper describes a practical photoacoustic spectroscopy technique applied to remote sensing of chemicals in an open environment. A laboratory system that consists of a high-power CO₂ laser and an open-field acoustic resonator is described. The acoustic resonator is a combination of a parabolic reflector and a narrow-band cylindrical acoustic resonator that resonates at the laser modulation frequency. The performance of the resonator is theoretically analyzed and experimentally verified. Significant improvement in signal-to-noise ratio has been achieved. Detection of gas-phase photoacoustic signals was demonstrated at a remote distance of several meters from the target. Potential applications to the detection of condensed-phase chemicals are discussed; the detection of the photoacoustic spectrum of trinitrotoluene (TNT) in an open environment is presented.

Citation Download Citation

Hual-Te Chien, Ke Wang, Shuh-Haw Sheen, and A. C. Paul Raptis "Photoacoustic spectroscopy (PAS) system for remote detection of explosives, chemicals, and special nuclear materials", Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83581K (9 May 2012); https://doi.org/10.1117/12.919351

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