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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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InAsSb Photodiode Fibre Optic Thermometry for High-Speed, near-Ambient Temperature Measurements.

Emilios Leonidas1,2, Matthew J Hobbs2, Sabino Ayvar-Soberanis3

  • 1Department of Material Science & Engineering, University of Sheffield, Sheffield S1 3JD, UK.

Sensors (Basel, Switzerland)
|December 9, 2023
PubMed
Summary

A new infrared radiation thermometer (IRT) offers fast, reliable temperature measurements near room temperature. This advancement promises to replace traditional thermocouples in demanding applications.

Keywords:
InAsSbinfrared radiation thermometermeasurementmonitoringphotodiodepyrometerradiation thermometrytemperature

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Traditional thermocouples face limitations in responsiveness and calibration drift.
  • Accurate, rapid temperature measurement near ambient conditions remains a challenge for existing radiation thermometry.
  • Developing advanced sensors is crucial for monitoring dynamic processes in various industries.

Purpose of the Study:

  • To develop and evaluate a novel infrared radiation thermometer (IRT) for high-speed, near-ambient temperature measurements.
  • To address the limitations of current temperature sensing technologies in specific industrial applications.
  • To demonstrate the potential of a new IRT as a thermocouple replacement.

Main Methods:

  • Designed an IRT utilizing an uncooled indium arsenide antimony (InAsSb) photodiode sensitive to 3 μm–11 μm wavelengths.
  • Incorporated a transimpedance amplifier and a silver halide fiber optic cable for infrared transmission.
  • Calibrated the prototype IRT using Planck's law with a five-point calibration method.

Main Results:

  • The prototype IRT achieved temperature measurements between 35 °C–100 °C (5 ms integration) and 40 °C–100 °C (1 ms integration).
  • Demonstrated a root mean square (RMS) noise level below 0.5 °C.
  • Achieved a measurement uncertainty of ±1.5 °C within the tested temperature range.

Conclusions:

  • The developed IRT shows significant potential for replacing thermocouples in applications requiring fast, near-ambient temperature monitoring.
  • The technology is suitable for high-speed processes like electric motor monitoring, battery protection, and machining of polymers and composites.
  • Further development aims to enhance the IRT's capabilities for broader industrial adoption.