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Title: Temperature effects on a fiber-optic evanescent wave absorption sensor

Abstract

A coiled fiber-optic chemical sensor has proven to be effective for the remote detection of volatile organic compounds, such as trichloroethylene (TCE), 1,1-dichloroethylene (DCE), and gasoline, in aqueous solutions. The analyte diffuses into the hydrophobic cladding and evanescent wave absorption spectra are measured in the near-infrared (1600-1850 nm) without the presence of the water absorption bands. In order for fiber-optic chemical sensors to operate effectively in remote environments, the influence of temperature on the sensor response must be known. The C-H bonds of the polysiloxane cladding material also have absorption bands in the near-infrared (NIR). Changes in temperature will change the density (i.e., concentration of C-H bonds) and refractive index of the cladding. Due to these effects, a temperature change of only 3[degree]C from the reference has been shown to significantly alter the background absorbance. The temperature-dependent background absorption is found to be linear with the slope, and the values are proportional to the absorption coefficient of the cladding material. The intercept of the absorbance vs. temperature plot is found to follow the first derivative of the fiber sensor transmission spectrum. Evanescent wave absorption spectra of TCE solutions have been corrected for temperature.

Authors:
 [1]; ;  [2];  [3];  [1]
  1. Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
  2. Kernforschungszentrum, Institute for Radiochemistry, 76021 Karlsruhe (Germany)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
7004998
DOE Contract Number:  
W-7405-ENG-48; AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Applied Spectroscopy; (United States)
Additional Journal Information:
Journal Volume: 48:3; Journal ID: ISSN 0003-7028
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; TEMPERATURE DEPENDENCE; FIBER OPTICS; AQUEOUS SOLUTIONS; NOISE; DISPERSIONS; MIXTURES; SOLUTIONS; SPECTRA; 360606* - Other Materials- Physical Properties- (1992-)

Citation Formats

Klunder, G L, Buerck, J, Ache, H, Silva, R J, and Russo, R E. Temperature effects on a fiber-optic evanescent wave absorption sensor. United States: N. p., 1994. Web. doi:10.1366/0003702944028344.
Klunder, G L, Buerck, J, Ache, H, Silva, R J, & Russo, R E. Temperature effects on a fiber-optic evanescent wave absorption sensor. United States. doi:10.1366/0003702944028344.
Klunder, G L, Buerck, J, Ache, H, Silva, R J, and Russo, R E. Tue . "Temperature effects on a fiber-optic evanescent wave absorption sensor". United States. doi:10.1366/0003702944028344.
@article{osti_7004998,
title = {Temperature effects on a fiber-optic evanescent wave absorption sensor},
author = {Klunder, G L and Buerck, J and Ache, H and Silva, R J and Russo, R E},
abstractNote = {A coiled fiber-optic chemical sensor has proven to be effective for the remote detection of volatile organic compounds, such as trichloroethylene (TCE), 1,1-dichloroethylene (DCE), and gasoline, in aqueous solutions. The analyte diffuses into the hydrophobic cladding and evanescent wave absorption spectra are measured in the near-infrared (1600-1850 nm) without the presence of the water absorption bands. In order for fiber-optic chemical sensors to operate effectively in remote environments, the influence of temperature on the sensor response must be known. The C-H bonds of the polysiloxane cladding material also have absorption bands in the near-infrared (NIR). Changes in temperature will change the density (i.e., concentration of C-H bonds) and refractive index of the cladding. Due to these effects, a temperature change of only 3[degree]C from the reference has been shown to significantly alter the background absorbance. The temperature-dependent background absorption is found to be linear with the slope, and the values are proportional to the absorption coefficient of the cladding material. The intercept of the absorbance vs. temperature plot is found to follow the first derivative of the fiber sensor transmission spectrum. Evanescent wave absorption spectra of TCE solutions have been corrected for temperature.},
doi = {10.1366/0003702944028344},
journal = {Applied Spectroscopy; (United States)},
issn = {0003-7028},
number = ,
volume = 48:3,
place = {United States},
year = {1994},
month = {3}
}