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Optical pH sensor for the alkaline region

Optical pH sensor for the alkaline region

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An optical sensor incorporating near infrared optical electronics which measures pH in the alkaline region is reported. Contaminants within the aqueous solutions whose pH is being measured interfered with the evanescent wave sensing technique and a method to overcome this problem is demonstrated.

Inspec keywords: chemical sensors; fibre optic sensors; pH measurement

Other keywords: alkaline region; optical pH sensor; near infrared opto-electronics; evanescent wave sensing technique

Subjects: Fibre optic sensors; fibre gyros; Chemical variables measurement; Fibre optic sensors; Chemical sensors

References

    1. 1)
      • J. Livage , C. Sanchez . Sol-gel chemistry. J. Non-Cryst. Solids , 11 - 19
    2. 2)
      • O.S. Wolfbeis . (1991) Fiber optic chemical sensors and biosensors.
    3. 3)
      • Haruvy, Y., Heller, A., Webber, S.E.: `Supported sol-gel thin-film glasses embodying laser dyes II: Three-layeredwaveguide assemblies', Proc. SPIE 1590, 1991, p. 59–70.
    4. 4)
      • R. Blue , G. Stewart . Fibre optic evanescent wave pH sensing with dye doped sol-gel films. Int. J. Optoelectron. , 3 , 211 - 222
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