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• Zhang, Y
• Pickrell, GR.
• Qi, B
• Safaai-Jazi, A
• Wang, A
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• Zhang, Y
• Pickrell, GR.
• Qi, B
• Safaai-Jazi, A
• Wang, A
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• Pickrell, GR.
• Qi, B
• Safaai-Jazi, A
• Wang, A

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Sensors 2006, 6(8), 823-834; doi:10.3390/s6080823

Article

Single-crystal Sapphire Based Optical Polarimetric Sensor for High Temperature Measurement

Yibing Zhang ¹ , Gary R. Pickrell ² , Bing Qi ³ , Ahmad Safaai-Jazi ²  and Anbo Wang ^2,*

¹ Johns Hopkins University, Biomedical Engineering Department, Cardiac Bioelectric System Laboratory, Baltimore MD 21205, U.S.A ² Virginia Polytechnic Institute and State University, Bradley Department of Electrical and Computer Engineering, Center for Photonics Technology, Blacksburg, Virginia 24061, U.S.A ³ Center for Quantum Information and Quantum Control, Department of Physics, University of Toronto, Toronto, Ontario, M5S, 1A7, Canada

* Author to whom correspondence should be addressed.

Received: 19 December 2005 / Accepted: 12 February 2006 / Published: 21 August 2006

(This article belongs to the Special Issue Photonic Sensors for Chemical, Biological, and Nuclear Agent Detection)

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Abstract: Optical sensors have been investigated and widely deployed in industrial andscientific measurement and control processes, mainly due to their accuracy, high sensitivityand immunity to electromagnetic interference and other unique characteristics. They areespecially suited for harsh environments applications, where no commercial electricalsensors are available for long-term stable operations. This paper reports a novel contactoptical high temperature sensor targeting at harsh environments. Utilizing birefringentsingle crystal sapphire as the sensing element and white light interferometric signalprocessing techniques, an optical birefringence based temperature sensor was developed.With a simple mechanically structured sensing probe, and an optical spectrum-codedinterferometric signal processor, it has been tested to measure temperature up to 1600 °Cwith high accuracy, high resolution, and long-term measurement stability.

Keywords: optical sensor; high temperature measurement; polarimetry; birefringence; whitelight interefrometry

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