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Optical temperature sensor using Eu3+-doped fluoride glass.

Y Ohishi1, S Takahashi

  • 1NTT Ibaraki Electrical Communication Laboratories, Tokai, Ibaraki 319-11, Japan.

Applied Optics
|March 1, 1986
PubMed
Summary

A novel thermooptical temperature sensor utilizes Europium (Eu3+)-doped fluoride glass for accurate low-temperature measurements. This sensor achieves a 0.5 K resolution between 77-150 K, with performance tunable by doping concentration.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Low-Temperature Physics

Background:

  • Accurate temperature sensing is critical in various scientific and industrial applications, especially at cryogenic temperatures.
  • Existing low-temperature sensors may face limitations in sensitivity, range, or material compatibility.
  • Thermooptical materials offer a promising alternative for temperature measurement through optical property changes.

Purpose of the Study:

  • To propose and validate a novel thermooptical temperature sensor.
  • To investigate the thermooptical properties of Europium (Eu3+)-doped fluoride glass for temperature sensing.
  • To determine the sensor's performance characteristics, including temperature resolution and applicable range.

Main Methods:

  • Utilizing Europium (Eu3+)-doped fluoride glass as a thermooptical transducer.

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  • Monitoring the optical absorption intensity of the Eu3+ (7)F1-(7)F6 transition (at 2.2 microm) as a function of temperature.
  • Employing a Eu3+-doped fluoride fiber to experimentally verify temperature-resolving power.

    • Main Results:

    • The optical absorption intensity of Eu3+ in fluoride glass is demonstrably modulated by temperature.
    • A temperature-resolving power of 0.5 K was achieved within the 77-150 K temperature range.
    • The sensor's applicable temperature range and resolving power can be adjusted by varying the Eu3+ doping concentration.

    Conclusions:

    • Eu3+-doped fluoride glass is a viable material for developing low-temperature thermooptical sensors.
    • The proposed sensor demonstrates excellent temperature resolution in the cryogenic regime.
    • The tunability of performance via doping concentration offers flexibility for diverse applications.