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

Recent measurements with Ru2+ oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor
Recent measurements with Ru2+ oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor
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.
Austin, E.A.D.
49244605-390e-4a67-a184-58434ba30e7c
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Austin, E.A.D.
49244605-390e-4a67-a184-58434ba30e7c
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Austin, E.A.D. and Dakin, J.P. (2000) Recent measurements with Ru2+ oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor. SPIE: Fiber Optic Sensor Technology II, Boston, United States. 05 - 08 Nov 2000. (doi:10.1117/12.417423).

Record type: Conference or Workshop Item (Paper)

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.

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More information

Published date: 2000
Additional Information: 4204A-44 (Invited)
Venue - Dates: SPIE: Fiber Optic Sensor Technology II, Boston, United States, 2000-11-05 - 2000-11-08

Identifiers

Local EPrints ID: 16899
URI: https://eprints.soton.ac.uk/id/eprint/16899
PURE UUID: d917c5df-16a1-4732-9e43-a398ff58aedd

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Date deposited: 17 Aug 2005
Last modified: 05 Jun 2018 16:30

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