Standoff chemical detection using quantum cascade lasers and photoacoustic sensing

Chen, Xing; Janssen, Douglas; Choa, Fow-Sen

doi:10.1117/12.884387

Cited by 1 publication

(1 citation statement)

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“…In the absence of a sealed PA cell, acoustic waves spread, broadening their already minimal energy below the detection limits of acoustic detectors. Limited techniques have been investigated for the detection of PA signals at standoff distances, including a microphone and interferometric sensors; 9,25,26 however, microphones are not well suited for the task of ranged measurement of the PA signal as the acoustic waves have been shown to decay as detection distance increases, and different signal phase delays corresponding to the standoff distance have been observed. 27 Interferometric sensors are an attractive alternative as they provide high sensitivity over long distances (>300 m) and maintain eye safety.…”

Section: Introductionmentioning

confidence: 99%

Standoff Photoacoustic Spectroscopy of Explosives

2016

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Detection and identification of unknown and possibly hazardous materials is a vital area of research to which infrared (IR) spectroscopy is ideally suited. Infrared absorption spectra can be measured with many sensing paradigms of which photoacoustic spectroscopy (PAS) is a sensitive and flexible variant. The flexibility of PAS allows for the construction of narrowly tailored spectroscopic sensors that are designed for specific tasks. We discuss the evaluation of an interferometric PAS sensor by the measurement of common explosive hazards from a standoff distance of 1 m. Reproduction of IR absorption spectra for 1,3,5-trinitroperhydro-1,3,5-triazine (RDX), pentaerythritol tetranitrate (PETN), and 2,4,6-trinitrotoluene (TNT) demonstrate the capabilities of the interferometric sensor for standoff explosives detection.

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