City Research Online

Abstract

Even though many different designs for currently available, fluorescence-based fiber optic sensors for measuring pH and oxygen concentration (O2) are well known (and often commercially available), they often are limited by their response time and drift. This can cause problems in the important applications of fiber optic sensors of this type, evident for example in physiology and other fields. Research by a number of groups has discussed the various new designs of fiber optical sensors which have been developed: key features of such probes are, for example, tip shape and coating layer thickness. This research reported here has concerned the performance of several new fiber optic-based sensors where fast response has been the priority: achieving response times of < 5 second for pH sensing and < 0.4 second for oxygen (O2) sensors. The performance of a group of sensors of this type have been analyzed, examining sensor accuracy, mechanical stability and overall long term stability, as well as any cross-sensitivity to any temperature changes which may be experienced.

Publication Type:	Article
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering

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