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Thin-filament pyrometry with a digital still camera.

Jignesh D Maun1, Peter B Sunderland, David L Urban

  • 1Department of Fire Protection Engineering, University of Maryland, College Park, MD 20742, USA.

Applied Optics
|January 19, 2007
PubMed
Summary

A new thin-filament pyrometer uses a digital camera for accurate gas temperature measurements in flames. This method offers high resolution and reduced soot interference compared to traditional thermocouples.

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Area of Science:

  • Combustion science
  • Optical diagnostics
  • Materials science

Background:

  • Accurate gas temperature measurement is crucial for understanding combustion processes.
  • Traditional methods like thermocouples face limitations in harsh environments due to soot deposition and response time.
  • Novel pyrometry techniques are needed to overcome these challenges.

Purpose of the Study:

  • To develop and validate a novel thin-filament pyrometer for high-resolution gas temperature measurements.
  • To assess the performance of the pyrometer in a methane-air diffusion flame.
  • To compare the pyrometer's effectiveness against traditional thermocouple measurements.

Main Methods:

  • A consumer-grade, 6-megapixel digital camera with 12 bits per color plane was utilized.

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  • Uniform silicon carbide (SiC) fibers with a 13.9 µm diameter were employed as the sensing element.
  • Measurements were conducted in a methane-air coflowing laminar jet diffusion flame.
  • Calibration was performed using B-type thermocouples.

    • Main Results:

    • The pyrometer achieved gas temperatures ranging from 1400-2200 K with an uncertainty of ±60 K.
    • High temperature resolution (±0.215 K), spatial resolution (42 µm), and temporal resolution (0.66 ms) were demonstrated.
    • Fiber aging for 10 minutes did not impact measurement accuracy.
    • The pyrometer exhibited less susceptibility to soot deposition compared to thermocouples.

    Conclusions:

    • The developed thin-filament pyrometer offers a viable, high-performance alternative for gas temperature measurements in combustion.
    • Its high resolution and robustness against soot make it suitable for challenging flame environments.
    • This technique advances optical diagnostic capabilities in combustion research.