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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 12 — Apr. 20, 2013
  • pp: 2626–2632

Standoff photoacoustic detection of explosives using quantum cascade laser and an ultrasensitive microphone

Xing Chen, Dingkai Guo, Fow-Sen Choa, Chen-Chia Wang, Sudhir Trivedi, A. Peter Snyder, Guoyun Ru, and Jenyu Fan  »View Author Affiliations


Applied Optics, Vol. 52, Issue 12, pp. 2626-2632 (2013)
http://dx.doi.org/10.1364/AO.52.002626


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Abstract

Standoff detections of explosives using quantum cascade lasers (QCLs) and the photoacoustic (PA) technique were studied. In our experiment, a mid-infrared QCL with emission wavelength near 7.35 μm was used as a laser source. Direct standoff PA detection of trinitrotoluene (TNT) was achieved using an ultrasensitive microphone. The QCL output light was focused on explosive samples in powder form. PA signals were generated and detected directly by an ultrasensitive low-noise microphone with 1 in. diameter. A detection distance up to 8 in. was obtained using the microphone alone. With increasing detection distance, the measured PA signal not only decayed in amplitude but also presented phase delays, which clearly verified the source location. To further increase the detection distance, a parabolic sound reflector was used for effective sound collection. With the help of the sound reflector, standoff PA detection of TNT with distance of 8 ft was demonstrated.

© 2013 Optical Society of America

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3420) Remote sensing and sensors : Laser sensors
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: January 3, 2013
Revised Manuscript: March 11, 2013
Manuscript Accepted: March 15, 2013
Published: April 15, 2013

Citation
Xing Chen, Dingkai Guo, Fow-Sen Choa, Chen-Chia Wang, Sudhir Trivedi, A. Peter Snyder, Guoyun Ru, and Jenyu Fan, "Standoff photoacoustic detection of explosives using quantum cascade laser and an ultrasensitive microphone," Appl. Opt. 52, 2626-2632 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-12-2626

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