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

doi:10.1117/12.850361

5 May 2010 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

Proceedings Volume 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI; 766506 (2010) https://doi.org/10.1117/12.850361
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

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.

Citation Download Citation

David M. Brown, Evan P. Thrush, Michael E. Thomas, Josh Santarpia, Jason Quizon, and Christopher C. Carter "Backscatter and depolarization measurements of aerosolized biological simulants using a chamber lidar system", Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 766506 (5 May 2010); https://doi.org/10.1117/12.850361

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

LIDAR

Aerosols

Calibration

Backscatter

Atmospheric modeling

Sensors

Atmospheric particles

Show All Keywords

Keywords/Phrases

Search In:

Publication Years