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Evanescent-wave spectroscopic fiber optic pH sensor

by: C. Egami, K. Takeda, M. Isai, and M. Ogita

In: Opt. Commun., Vol. 122, Nr. 4-6 (January 1996) , p. 122-126.

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URL:	http://www.sciencedirect.com/science/article/B6TVF-3VS8H5T-5/2/30dd4c043535573cf17337ebe6a02361

We demonstrate a new type of fiber optic pH sensor, which is the application of evanescent-wave spectroscopic technique. A methyl red MR-doped-polymethyl methacrylate PMMA film that coated as part of cladding does function as a pH sensor probe. In this system MR doped in PMMA is used as indicator dye for pH measurement. The absorption spectrum shift in wavelength of indicator dye enables us to get the pH value. The sensor probe is immersed in water solution containing a small proportion of acetic acid over the wide pH range of 5.0 to 7.0. The chemical interaction between MR in sensor probe and hydrogen ion in the water solution causes a change in the dipole moment of MR, that is, the absorption spectrum macroscopically. The evanescent-wave spectroscopic technique provides the measurement of the absorption spectrum shift over a broad range of visible wavelength. The result of experiment was that MR absorption spectrum shifted by 40 nm every increase of 1.0 in pH. The small change in the pH value can be sensed as a large wavelength shift of pH indicator absorption spectrum.

BibTeX record

@article{Egami1996,
  abstract = {We demonstrate a new type of fiber optic pH sensor, which is the application of evanescent-wave spectroscopic technique. A methyl red (MR)-doped-poly(methyl methacrylate) (PMMA) film that coated as part of cladding does function as a pH sensor probe. In this system MR doped in PMMA is used as indicator dye for pH measurement. The absorption spectrum shift in wavelength of indicator dye enables us to get the pH value. The sensor probe is immersed in water solution containing a small proportion of acetic acid over the wide pH range of 5.0 to 7.0. The chemical interaction between MR in sensor probe and hydrogen ion in the water solution causes a change in the dipole moment of MR, that is, the absorption spectrum macroscopically. The evanescent-wave spectroscopic technique provides the measurement of the absorption spectrum shift over a broad range of visible wavelength. The result of experiment was that MR absorption spectrum shifted by 40 nm every increase of 1.0 in pH. The small change in the pH value can be sensed as a large wavelength shift of pH indicator absorption spectrum.},
  added-at = {2010-03-09T22:06:09.000+0100},
  author = {Egami, C. and Takeda, K. and Isai, M. and Ogita, M.},
  biburl = {http://www.bibsonomy.org/bibtex/27b7ba02f1e38b7ce22e0a1b766338223/afcallender},
  file = {Egami1996.pdf:indexed\\Egami1996.pdf:PDF},
  interhash = {5abf70d096676df9d326ea6e1fcec637},
  intrahash = {7b7ba02f1e38b7ce22e0a1b766338223},
  journal = {Opt. Commun.},
  keywords = {absorbance fiber-optic sensor},
  month = {January},
  number = {4-6},
  pages = {122-126},
  timestamp = {2010-03-09T22:06:09.000+0100},
  title = {Evanescent-wave spectroscopic fiber optic pH sensor},
  url = {http://www.sciencedirect.com/science/article/B6TVF-3VS8H5T-5/2/30dd4c043535573cf17337ebe6a02361},
  volume = 122,
  year = 1996
}

Endnote record

%0 Journal Article
%1 Egami1996
%A Egami, C.
%A Takeda, K.
%A Isai, M.
%A Ogita, M.
%D 1996
%J Opt. Commun.
%K 
%N 4-6
%P 122-126
%T Evanescent-wave spectroscopic fiber optic pH sensor
%U http://www.sciencedirect.com/science/article/B6TVF-3VS8H5T-5/2/30dd4c043535573cf17337ebe6a02361
%V 122
%X We demonstrate a new type of fiber optic pH sensor, which is the application of evanescent-wave spectroscopic technique. A methyl red (MR)-doped-poly(methyl methacrylate) (PMMA) film that coated as part of cladding does function as a pH sensor probe. In this system MR doped in PMMA is used as indicator dye for pH measurement. The absorption spectrum shift in wavelength of indicator dye enables us to get the pH value. The sensor probe is immersed in water solution containing a small proportion of acetic acid over the wide pH range of 5.0 to 7.0. The chemical interaction between MR in sensor probe and hydrogen ion in the water solution causes a change in the dipole moment of MR, that is, the absorption spectrum macroscopically. The evanescent-wave spectroscopic technique provides the measurement of the absorption spectrum shift over a broad range of visible wavelength. The result of experiment was that MR absorption spectrum shifted by 40 nm every increase of 1.0 in pH. The small change in the pH value can be sensed as a large wavelength shift of pH indicator absorption spectrum.

BibSonomy :: publication ::

Evanescent-wave spectroscopic fiber optic pH sensor

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