Backscatter and depolarization measurements of aerosolized biological simulants using a chamber LIDAR system

David M. Brown, Evan P. Thrush, Michael E. Thomas, Josh Santarpia, Jason Quizon, Christopher C. Carter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To ensure agent optical cross sections are well understood from the UV to the LWIR, volume integrated measurements of aerosolized agent material at a few key wavelengths is required to validate existing simulations. Ultimately these simulations will be used to assess the detection performance of various classes of lidar technology spanning the entire range of the optical spectrum. The present work demonstrates an optical measurement architecture based on lidar allowing the measurement of backscatter and depolarization ratio from biological aerosols released in a refereed, 1-m cubic chamber. During 2009, various upgrades have been made to the chamber LIDAR system, which operates at 1.064 μm with sub nanosecond pulses at a 120 Hz repetition rate. The first build of the system demonstrated a sensitivity of aerosolized Bacillus atrophaeus (BG) on the order of 5×105 ppl with 1 GHz InGaAs detectors. To increase the sensitivity and reduce noise, the InGaAs detectors were replaced with larger-area silicon avalanche photodiodes for the second build of the system. In addition, computer controlled step variable neutral density filters are now incorporated to facilitate calibrating the system for absolute back-scatter measurements. Calibrated hard target measurements will be combined with data from the ground truth instruments for cross-section determination of the material aerosolized in the chamber. Measured results are compared to theoretical simulations of cross-sections.

Original languageEnglish (US)
Title of host publicationChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI
DOIs
StatePublished - 2010
EventChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI - Orlando, FL, United States
Duration: Apr 6 2010Apr 8 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7665
ISSN (Print)0277-786X

Other

OtherChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI
CountryUnited States
CityOrlando, FL
Period4/6/104/8/10

Keywords

  • LIDAR
  • biological simulants
  • depolarization
  • simulant cross sections

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Brown, D. M., Thrush, E. P., Thomas, M. E., Santarpia, J., Quizon, J., & Carter, C. C. (2010). Backscatter and depolarization measurements of aerosolized biological simulants using a chamber LIDAR system. In Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI [766506] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7665). https://doi.org/10.1117/12.850361