title: Chemical aerosol Raman detector.
abstract: A sensitive chemical aerosol Raman detector (CARD) has been developed for the trace detection and identification of chemical particles in the ambient atmosphere. CARD includes an improved aerosol concentrator with a concentration factor of about 40 and a CCD camera for improved detection sensitivity. Aerosolized isovanillin, which is relatively safe, has been used to characterize the performance of the CARD. The limit of detection (SNR = 10) for isovanillin in 15 s has been determined to be 1.6 pg/cm3, which corresponds to 6.3 × 109molecules/cm3or 0.26 ppb. While less sensitive, CARD can also detect gases. This paper provides a more detailed description of the CARD hardware and detection algorithm than has previously been published.
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: R L
authors.identifier: 0000000347088524
authors.initials: RL
authors.lastname: Aggarwal
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: L W
authors.initials: LW
authors.lastname: Farrar
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: S
authors.initials: S
authors.lastname: Di Cecca
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: M
authors.initials: M
authors.lastname: Amin
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: B G
authors.initials: BG
authors.lastname: Perkins
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Clark
authors.affiliation: MIT Lincoln Laboratory, Lexington, Massachusetts 02420-9108, USA.
authors.forename: T H
authors.initials: TH
authors.lastname: Jeys
authors.affiliation: Edgewood Chemical Biological Center, Aberdeen, Maryland 21010-5425, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Sickenberger
authors.affiliation: Edgewood Chemical Biological Center, Aberdeen, Maryland 21010-5425, USA.
authors.forename: F M
authors.initials: FM
authors.lastname: D'Amico
authors.affiliation: Edgewood Chemical Biological Center, Aberdeen, Maryland 21010-5425, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Emmons
authors.affiliation: Edgewood Chemical Biological Center, Aberdeen, Maryland 21010-5425, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Christesen
authors.affiliation: Edgewood Chemical Biological Center, Aberdeen, Maryland 21010-5425, USA.
authors.forename: R J
authors.identifier: 000000023633581X
authors.initials: RJ
authors.lastname: Kreis
authors.affiliation: Excet, Inc., Springfield, Virginia 22150, USA.
authors.forename: G K
authors.initials: GK
authors.lastname: Kilper