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Surface-mount sapphire interferometric temperature sensor.

Yizheng Zhu1, Anbo Wang

  • 1Department of Electrical and Computer Engineering, Center for Photonics Technology, Virginia Polytechnic Institute and Satae University, Blacksburg, 24061, USA. yizhul@vt.edu

Applied Optics
|August 8, 2006
PubMed
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A novel fiber-optic sensor using sapphire demonstrates high-temperature measurement capabilities up to 1,170°C. This innovative sensor achieves a resolution of 0.4°C, showing great promise for demanding industrial applications.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Accurate high-temperature measurement is critical in various industrial processes.
  • Existing sensors often face limitations in extreme temperature environments.
  • Sapphire's unique properties make it suitable for high-temperature sensing applications.

Purpose of the Study:

  • To demonstrate a novel fiber-optic sensor for high-temperature measurement.
  • To investigate the performance and characteristics of a sapphire-based sensor.
  • To achieve adhesive-free coupling for enhanced sensor durability.

Main Methods:

  • A 45°-polished single-crystal sapphire fiber was bonded to a sapphire wafer.
  • White-light interferometry was employed to measure the temperature-dependent optical thickness.

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  • Fusion splicing was used to create an adhesive-free coupling between silica and sapphire fibers.
  • The sensor's interference signal was analyzed for angular alignment dependence.

    • Main Results:

    • A prototype sensor was successfully tested up to 1,170°C.
    • The sensor achieved a temperature resolution of 0.4°C.
    • An adhesive-free coupling method was successfully implemented and characterized.
    • The dependence of the interference signal on angular alignment was investigated.

    Conclusions:

    • The developed fiber-optic sensor shows excellent potential for high-temperature measurement.
    • The sapphire-based design offers robustness and high performance in extreme conditions.
    • The novel coupling technique enhances sensor reliability for industrial use.