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Research Papers

Light scattering of semitransparent sintered polytetrafluoroethylene films

[+] Author Affiliations
Qinghe Li, Bong Jae Lee, Zhuomin M. Zhang

Georgia Institute of Technology, George W. Woodruff School of Mechanical Engineering, Atlanta, Georgia 30332

David W. Allen

National Institute of Standards and Technology, Optical Technology Division, Gaithersburg, Maryland 20899

J. Biomed. Opt. 13(5), 054064 (October 06, 2008). doi:10.1117/1.2992485
History: Received March 06, 2008; Revised June 11, 2008; Accepted August 11, 2008; Published October 06, 2008
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Polytetrafluoroethylene (PTFE) is a strongly scattering material and has been regarded to have optical properties similar to biological tissues. In the present study, the bidirectional reflectance distribution function (BRDF) and the bidirectional transmittance distribution function (BTDF) of several PTFE films, with thicknesses from 0.11to10mm, are measured using a laser scatterometer at the wavelength of 635nm. The directional-hemispherical reflectance (R) and transmittance (T) were obtained by integrating BRDF and BTDF for normal incidence. Comparison of the ratio of the measured R and T with that calculated from the adding-doubling method allows the determination of the reduced scattering coefficient. Furthermore, the effect of surface scattering is investigated by measuring the polarization-dependent BRDF and BTDF at oblique incidence. By analyzing the measurement uncertainty of BTDF in the near-normal observation angles at normal incidence, the present authors found that the scattering coefficient of PTFE should exceed 1200cm1, which is much greater than that of biological tissues. On the other hand, the absorption coefficient of PTFE must be less than 0.01cm1, much smaller than that of biological tissues, a necessary condition to achieve R0.98 with a 10-mm-thick slab.

Figures in this Article
© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Qinghe Li ; Bong Jae Lee ; Zhuomin M. Zhang and David W. Allen
"Light scattering of semitransparent sintered polytetrafluoroethylene films", J. Biomed. Opt. 13(5), 054064 (October 06, 2008). ; http://dx.doi.org/10.1117/1.2992485


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