Extinction and backscatter cross sections of biological materials

M. E. Thomas; D. V. Hahn; A. K. Carr; D. Limsui; C. C. Carter; N. T. Boggs; J. Jackman

doi:10.1117/12.777650

21 April 2008 Extinction and backscatter cross sections of biological materials

M. E. Thomas, D. V. Hahn, A. K. Carr, D. Limsui, C. C. Carter, N. T. Boggs, J. Jackman

Proceedings Volume 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX; 69540Y (2008) https://doi.org/10.1117/12.777650
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

Aerosol backscatter and extinction cross-sections are required to model and evaluate the performance of both active and passive detection systems. A method has been developed that begins with laboratory measurements of thin films and suspensions of biological material to obtain the complex index refraction of the biological material from the UV to the LWIR. Using that result with particle size distribution and shape information as inputs to T-matrix or discrete dipole approximation (DDA) calculations yields the extinction cross-section and backscatter cross section as a function of wavelength. These are important inputs to the lidar equation. In a continuing effort to provide validated optical cross-sections, measurements have been made on a number of high purity biological species in the laboratory as well as measurements of material released at recent field tests. The resulting observed differences between laboratory and field measurements aid in distinguishing between intrinsic and extrinsic effects, which can affect the characteristic signatures of important biological aerosols. A variety of biological and test aerosols are examined, including Bacillus atrophaeus (BG), and Erwina, ovalbumin, silica and polystyrene.

Citation Download Citation

M. E. Thomas, D. V. Hahn, A. K. Carr, D. Limsui, C. C. Carter, N. T. Boggs, and J. Jackman "Extinction and backscatter cross sections of biological materials", Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 69540Y (21 April 2008); https://doi.org/10.1117/12.777650

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