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Dr. V P N Nampoori >
Please use this identifier to cite or link to this item:
http://purl.org/purl/1771
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| Title: | A sensitive fibre optic pH sensor using multiple sol–gel coatings |
| Authors: | V P N Nampoori
Radhakrishnan, P
Girijavallabhan, C P
Thomas Lee, S
Jose, Gin
Unnikrishnan, N V |
| Keywords: | Fibre optics
optical fibre
evanescent wave
sensor
pH
sol–gel
absorption
multi-layer |
| Issue Date: | 12-Jul-2001 |
| Publisher: | Journal of Optics A: Pure and Applied Optics |
| Citation: | International School of Photonics, Cochin University of Science and Technology |
| Abstract: | The fabrication and characterization of a fibre optic pH sensor based on
evanescent wave absorption is presented. The unclad portion of a
multi-mode optical fibre is coated with a pH sensitive dye, which is
immobilized by the sol–gel route. The sensitivity of the device has been
found to increase when multiple sol–gel coatings are used as the sensing
region. The dynamic range and the temporal response of the sensor are
investigated for two different dyes, namely bromocresol purple and
bromocresol green. The performance of the device is evaluated in terms of
the results obtained during actual measurements. |
| URI: | http://dyuthi.cusat.ac.in/purl/1771 |
| Appears in Collections: | Dr. V P N Nampoori
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