Fiber Optic Sensor for Simultaneous Measurement of pH and Dissolved Oxygen

The work describes the constructions of optical fiber based minimal invasive sensing system to measure pH and dissolved oxygen using sol-gel membranes which are attached internally in any transparent container. The disposable sensing membranes are very thin size and prepared as fluorescent dye doped...

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Bibliographic Details
Published in:Applied Mechanics and Materials Vol. 573; no. Advancements in Automation and Control Technologies; pp. 842 - 847
Main Authors: Deepa, N., Ganesh, A. Balaji
Format: Journal Article
Language:English
Published: Zurich Trans Tech Publications Ltd 01.01.2014
Subjects:
Detection
Dissolution
Fiber optics
Mathematical analysis
Optical fibers
Response time
Sensors
pH
Simultaneous Measurement
Fiber Optic Sensor
Dissolved Oxygen (DO)
Embedded Programming
ISBN:9783038351245, 3038351245
ISSN:1660-9336, 1662-7482, 1662-7482
Online Access:Get full text
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Summary:The work describes the constructions of optical fiber based minimal invasive sensing system to measure pH and dissolved oxygen using sol-gel membranes which are attached internally in any transparent container. The disposable sensing membranes are very thin size and prepared as fluorescent dye doped in silica film using simple procedures. The sensor characteristics such as response time, linearity, repeatability and reversibility are evaluated and the performance of the sensor also compared with commercial meters. The experiments such as, chemical stability and photo stability are also carried out. The detection limit of pH sensor is found between 3 pH and 10 pH, however good sensitivity is obtained for the ranges from 4 pH and 9 pH with the response time of 7 seconds. Non-linear response is obtained for dissolved oxygen sensor and it is made linear by applying Stern-Volmer equation. The oxygen sensor shows good sensitivity in the ranges from 2 mg/L to 8 mg/L.
Bibliography:Selected, peer reviewed papers from the 2014 International Conference on Advancements in Automation and Control (ICAAC 2014), April 11-12, 2014, Ramanathapuram, Tamilnadu, India
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ISBN:9783038351245
3038351245
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/www.scientific.net/AMM.573.842