Accession Number:

ADA609279

Title:

Photoacoustic Chemical Sensing: Ultracompact Sources and Standoff Detection

Descriptive Note:

Journal article

Corporate Author:

ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE

Report Date:

2014-08-01

Pagination or Media Count:

10.0

Abstract:

Photoacoustic spectroscopy PAS is a useful monitoring technique that is well suited for trace detection of gaseous and condensed media. We have previously demonstrated favorable PAS gas detection characteristics when the system dimensions are scaled to a micro-system design. This design includes quantum cascade laser QCL-based microelectromechanical systems MEMS-scale photoacoustic sensors that provide detection limits at parts-per-billion ppb levels for chemical targets. Current gas sensing research utilizes an ultra compact QCL, SpriteIR, in combination with a MEMS-scale photoacoustic cell for trace gas detection. At approximately one tenth the size of a standard commercially available QCL, SpriteIR is an essential element in the development of an integrated sensor package. We will discuss these results as well as the envisioned sensor prototype. Finally, expanding on our previously reported photoacoustic detection of condensed phase samples, we are investigating standoff photoacoustic chemical detection of these materials and will discuss preliminary results.

Subject Categories:

  • Miscellaneous Detection and Detectors
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE