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Equipments Used to Measure Body Temperature01:13

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High-temperature multiparameter sensor based on sapphire fiber Bragg gratings.

Stephen J Mihailov1, Dan Grobnic, Christopher W Smelser

  • 1Communications Research Centre Canada, 3701 Carling Avenue, P.O. Box 11490, Station H, Ottawa, Ontario K2H 8S2, Canada. stephen.mihailov@crc.gc.ca

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This study introduces a novel dual strain/temperature sapphire fiber Bragg grating sensor. It effectively distinguishes between temperature and strain effects using blackbody radiation measurements above 650°C.

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Area of Science:

  • Fiber optic sensing
  • Materials science
  • Optical engineering

Background:

  • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
  • Sapphire FBGs offer high-temperature resistance.
  • Simultaneous strain and temperature measurement presents a challenge due to wavelength shift overlap.

Purpose of the Study:

  • To develop and characterize a novel dual strain/temperature sensor using a sapphire fiber Bragg grating.
  • To evaluate the temperature and strain coefficients of the developed sensor.
  • To demonstrate a method for decoupling strain and temperature-induced wavelength shifts.

Main Methods:

  • Fabrication of a sapphire fiber Bragg grating sensor.
  • Experimental evaluation of the sensor's response to applied strain and temperature.
  • Analysis of wavelength shifts under varying conditions.
  • Utilizing blackbody radiation measurements above 650°C for temperature decoupling.

Main Results:

  • The sensor demonstrated dual-mode operation for strain and temperature.
  • Temperature and strain coefficients were successfully evaluated.
  • A novel method for decoupling temperature and strain effects was validated using blackbody radiation.

Conclusions:

  • The developed sapphire fiber Bragg grating sensor enables simultaneous and accurate measurement of strain and temperature.
  • The blackbody radiation method provides an effective means to resolve wavelength ambiguities in high-temperature FBG sensing.
  • This technology holds promise for harsh environment monitoring applications.