title: Trace aerosol detection and identification by dynamic photoacoustic spectroscopy.
abstract: Dynamic photoacoustic spectroscopy (DPAS) is a high sensitivity technique for standoff detection of trace vapors. A field-portable DPAS system has potential as an early warning provider for gaseous-based chemical threats. For the first time, we utilize DPAS to successfully detect the presence of trace aerosols. Aerosol identification via long-wavelength infrared (LWIR) spectra is demonstrated. We estimate the sensitivity of our DPAS system to aerosols comprised of silica particles is comparable to that of SF(6) gas based on a signal level per absorbance unit metric for the two materials. The implications of these measurements are discussed.
authors.forename: R M
authors.initials: RM
authors.lastname: Sullenberger
authors.forename: M L
authors.initials: ML
authors.lastname: Clark
authors.forename: R R
authors.initials: RR
authors.lastname: Kunz
authors.forename: A C
authors.initials: AC
authors.lastname: Samuels
authors.forename: D K
authors.initials: DK
authors.lastname: Emge
authors.forename: M W
authors.initials: MW
authors.lastname: Ellzy
authors.forename: C M
authors.initials: CM
authors.lastname: Wynn