Quick search Find article
Quick search
Find article

A sensitive fibre optic pH sensor using multiple sol-gel coatings

S Thomas Lee1, Jose Gin2, V P N Nampoori1, C P G Vallabhan1, N V Unnikrishnan2 and P Radhakrishnan1

Show affiliations


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.


PACS

42.81.Pa Sensors, gyros

42.81.Bm Fabrication, cladding, and splicing

82.80.Yc Rutherford backscattering (RBS), and other methods of chemical analysis

81.20.Fw Sol-gel processing, precipitation

Subjects

Optics, quantum optics and lasers

Condensed matter: structural, mechanical & thermal

Chemical physics and physical chemistry

Dates

Issue 5 (September 2001)

Received 16 March 2001, in final form 29 May 2001

Published 12 July 2001



  1. A sensitive fibre optic pH sensor using multiple sol-gel coatings

    S Thomas Lee et al 2001 J. Opt. A: Pure Appl. Opt. 3 355

  2. Local field distributions in spin glasses

    Stefan Boettcher et al 2008 J. Phys. A: Math. Theor. 41 324007

  3. Quiescent Isolation: The Extremely Extended H I Halo of the Optically Compact Dwarf Galaxy ADBS 113845+2008

    John M. Cannon et al. 2009 ApJ 696 2104

  4. The quest for very low-mass planets

    M Mayor and S Udry 2008 Phys. Scr. 2008 014010

  5. Hysteretic optimization for spin glasses

    B Gonçalves and S Boettcher J. Stat. Mech. (2008) P01003

  6. Sensors and actuators based on surface acoustic waves propagating along solid–liquid interfaces

    Gerhard Lindner 2008 J. Phys. D: Appl. Phys. 41 123002

  7. The development of electrical treeing in LDPE and its nanocomposites with spherical silica and fibrous and laminar silicates

    Pilar Tiemblo et al 2008 J. Phys. D: Appl. Phys. 41 125208

  8. Al/WO3/Au as the interconnecting layer for efficient tandem white organic light-emitting diodes

    Hongmei Zhang et al 2008 J. Phys. D: Appl. Phys. 41 102006

  9. Plasmonic properties of vapour-deposited polymer composites containing Ag nanoparticles and their changes upon annealing

    H Takele et al 2008 J. Phys. D: Appl. Phys. 41 125409

  10. Organic thin film transistors and polymer light-emitting diodes patterned by polymer inking and stamping

    Dawen Li and L Jay Guo 2008 J. Phys. D: Appl. Phys. 41 105115

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.