Fiber-optic high-temperature thermometer using sapphire fiber

Yizheng Zhu, Zhengyu Huang, Ming Han, Fabin Shen, Gary Pickrell, Anbo Wang

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Sapphire (single crystal alumina) has superior optical and mechanical properties. With a very high melting point of about 2050°C, sapphire fiber is an excellent candidate in optical fiber sensing area for high-temperature measurements. This paper presents a new type of sapphire-fiber-based extrinsic Fabry-Perot interferometric (EFPI) temperature sensor. The spectral interference pattern is generated by a sapphire diaphragm placed in front of the sapphire fiber. The sensing element is interrogated by a white-light source. Temperature is demodulated from the spectral change of interference pattern. Prototype sensor is tested at high temperature up to 1545°C. Both theoretical and experimental analysis are presented. Preliminary data shows the sensor is very promising for measuring ultra-high temperature.

Original languageEnglish (US)
Article number03
Pages (from-to)19-26
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
Externally publishedYes
EventSensors for Harsh Environments - Philadelphia, PA, United States
Duration: Oct 26 2004Oct 27 2004


  • Fiber optic sensor
  • Interferometric
  • Sapphire fiber
  • Temperature sensor
  • White-light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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