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Title: Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air

Abstract

Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. However, the reflectance of PTFE is a function of its thickness. In this work, we investigate this dependence in air for light of wavelengths 260 nm and 450 nm using two complementary methods. We find that PTFE reflectance for thicknesses from 5 mm to 10 mm ranges from 92.5% to 94.5% at 450 nm, and from 90.0% to 92.0% at 260 nm. We also see that the reflectance of PTFE of a given thickness can vary by as much as 2.7% within the same piece of material. Finally, we show that placing a specular reflector behind the PTFE can recover the loss of reflectance in the visible without introducing a specular component in the reflectance.

Authors:
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
NEXT
OSTI Identifier:
1647060
Report Number(s):
FERMILAB-PUB-20-385-ND-SCD; arXiv:2007.06626
oai:inspirehep.net:1806865
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Ghosh, S., and et al. Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air. United States: N. p., 2020. Web.
Ghosh, S., & et al. Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air. United States.
Ghosh, S., and et al. Mon . "Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air". United States. https://www.osti.gov/servlets/purl/1647060.
@article{osti_1647060,
title = {Dependence of polytetrafluoroethylene reflectance on thickness at visible and ultraviolet wavelengths in air},
author = {Ghosh, S. and et al.},
abstractNote = {Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. However, the reflectance of PTFE is a function of its thickness. In this work, we investigate this dependence in air for light of wavelengths 260 nm and 450 nm using two complementary methods. We find that PTFE reflectance for thicknesses from 5 mm to 10 mm ranges from 92.5% to 94.5% at 450 nm, and from 90.0% to 92.0% at 260 nm. We also see that the reflectance of PTFE of a given thickness can vary by as much as 2.7% within the same piece of material. Finally, we show that placing a specular reflector behind the PTFE can recover the loss of reflectance in the visible without introducing a specular component in the reflectance.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {7}
}