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A Novel Technique for Optical Fibre pH Sensing based on Methylene Blue Adsorption.

Deboux, B.J.-C. Lewis, E. Scully, P.J. Edwards, R

Journal of Lightwave Technology. 1995;Volume: 13 , Issue: 7:1407-1414.

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Abstract

A novel fiber optic pH sensor is reported. The sensor is based upon surfacic adsorption of methylene blue dye, producing absorption in the evanescent field surrounding the sensing fiber. The sensor is based upon a 200 μm diameter Plastic Clad Silica (PCS) fiber which has its cladding removed in order to expose its core. The linear range of operation is between pH 3 and pH 9 and its response time is considerably shorter than indicator based probes which measure spectral changes of pH sensitive chemicals. Effects of measurand ionic strength are shown to be negligible which is a further important advantage of this sensor over other optical fiber pH sensors. The sensor design is sufficiently flexible to allow it to be configured in probe (reflective) or in-line (transmissive) form. The latter allows the application of time domain reflectometry technique which may be used to achieve multipoint (distributed) sensing

Bibliographic metadata

Type of resource:
Content type:
Published date:
Publisher:
Volume:
Volume: 13 , Issue: 7
Start page:
1407
End page:
1414
Pagination:
1407 - 1414
Digital Object Identifier:
10.1109/50.400705
Related website(s):
  • Related website http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00400705
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:1a12284
Created:
6th August, 2009, 13:27:08
Last modified:
7th August, 2013, 18:51:35

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