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

E. A.D. Austin; John P. Dakin

doi:10.1117/12.417423

1 March 2001 Recent measurements with Ru²⁺oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor

E. A.D. Austin, John P. Dakin

Author Affiliations +

Proceedings Volume 4204, Fiber Optic Sensor Technology II; (2001) https://doi.org/10.1117/12.417423
Event: Environmental and Industrial Sensing, 2000, Boston, MA, United States

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 Ru2+-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 Ru2+-chemical sensors.

Citation Download Citation

E. A.D. Austin and John P. Dakin "Recent measurements with Ru²⁺oxygen sensors using doped sapphire crystals both as a calibration aid and an integral temperature sensor", Proc. SPIE 4204, Fiber Optic Sensor Technology II, (1 March 2001); https://doi.org/10.1117/12.417423

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