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Recent measurements with Ru2+ oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor

By E.A.D. Austin and J.P. Dakin

Abstract

Recent measurements are presented, using an improved, real-time, all-optical sensor for simultaneous measurement of dissolved oxygen and temperature. The sensor has a small Cr3+ - doped sapphire (ruby) thermal monitoring crystal mounted at the probe tip, to which is bonded a Ru3+-based oxygen-indicator membrane. The probe may be interrogated in real-time, using, for both temperature and oxygen monitoring, the same combination of blue LED, light source, optical filter set, photomultiplier detector and digital processor. The ruby crystal also provides a fluorescent intensity reference, for possible on-line self-testing of the interrogation hardware. By examining the relative intensities from ruby and the membrane, mechanical damage, detachment or photo-bleaching of the sensing membrane may also be recognised. Recent developments of our novel, Ti3+-doped sapphire fluorescence-lifetime calibration probe are reported. These confirm that the fluorescence lifetime of the probe can be thermally controlled-in a reliable manner. This calibration probe then allows multi-point calibration of Ru3+-chemical sensors

Topics: QC, TK
Year: 2000
OAI identifier: oai:eprints.soton.ac.uk:16899
Provided by: e-Prints Soton

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