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

Report Date:

2015-07-22

Pagination or Media Count:

7.0

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 pgcm3 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 f1.8 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.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Miscellaneous Detection and Detectors
  • Chemical, Biological and Radiological Warfare

Distribution Statement:

APPROVED FOR PUBLIC RELEASE