Abstract:
:The present work describes the fabrication and characterization of an optical fiber pH sensor using a sol–gel technique. The sensing head configuration is incorporated using a short section of no-core fiber, coated with tetraethyl orthosilicate and spliced at the end of a single mode fiber with a bulge. Different types of indicators (bromophenol blue, cresol red, and chlorophenol red) were used to achieve a wide pH range from 2 to 13. High sensitivities of the fabricated device were found to be 1.02 and ? 0.93 ?? nm / pH for acidic and alkaline solutions, respectively. From the characterization results, it was noted that there is an impact of ionic strength and an effect of the temperature of liquid on the response characteristic, which is an advantage of the existing device over the other pH sensors. The fabricated sensor exhibited good reflection spectrum, indicating a blueshift in resonance wavelength for alkaline solutions and a redshift for acidic solutions.
journal_name
J Biomed Optjournal_title
Journal of biomedical opticsauthors
Bhardwaj V,Pathak AK,Singh VKdoi
10.1117/1.JBO.22.5.057001subject
Has Abstractpub_date
2017-05-01 00:00:00pages
57001issue
5eissn
1083-3668issn
1560-2281pii
2626549journal_volume
22pub_type
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