Accession Number : AD1033572

Title :   Sensitive Detection and Identification of Isovanillin Aerosol Particles at the pg/cm3 Mass Concentration Level using Raman Spectroscopy

Descriptive Note : Journal Article - Open Access

Corporate Author : MIT Lincoln Laboratory Lexington United States

Personal Author(s) : Aggarwal,Roshan L ; Di Cecca,Salvatore ; Farrar,Lewis W ; Shabshelowitz,Adam ; Jeys,Thomas H

Full Text :

Report Date : 22 Jul 2015

Pagination or Media Count : 7

Abstract : A compact Raman spectroscopy system with high sensitivity to chemical aerosols has been developed. This system has been used to detect isovanillin aerosols with mass concentration of 12 pg/cm3 in a 15 s signal integration period with a signaltonoise ratio of32. We believe this represents the lowest chemical aerosol concentration and signal integration period product ever reported for a Raman spectroscopy system. The Raman system includes (i) a 10 W, 532nm cw laser, (ii) an aerosol flow cell, (iii) a 60x aerosol concentrator, (iv) an f/1.8 Raman spectrometer with a spectral range of 4001400 cm1 and a resolution of 4 cm1, and (v) a lownoise CCD camera (1340x400 pixels). The collection efficiency of the Raman system has been determined to be 2.8%. Except for the laser cooling subsystem, the Raman system fits in a 0.61 m x 0.61 m x 0.61 m box.

Descriptors :   detection , raman spectroscopy , particles , AEROSOLS , CHEMICAL AGENT DETECTION , laser cooling , transmittance

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Miscellaneous Detection and Detectors
      Chemical, Biological and Radiological Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE