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Single diode laser sensor for wide-range H2O temperature measurements.

Mohammadreza Gharavi1, Steven G Buckley

  • 1Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA.

Applied Spectroscopy
|December 5, 2006
PubMed
Summary

A new diode laser sensor measures temperature and water vapor simultaneously. This technology is ideal for combustion systems, offering sensitive measurements across a wide temperature range.

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Area of Science:

  • Spectroscopy
  • Laser-based sensing
  • Combustion diagnostics

Background:

  • Accurate temperature and H2O concentration measurements are crucial for understanding and controlling combustion processes.
  • Existing methods may have limitations in sensitivity or applicability across wide temperature ranges.

Purpose of the Study:

  • To develop and validate a single diode laser absorption sensor for simultaneous temperature and H2O concentration measurements.
  • To assess the suitability of specific H2O absorption transitions for sensitive temperature measurements in combustion environments.

Main Methods:

  • Utilized a diode laser sensor tuned near 1477 nm to probe three H2O absorption transitions.
  • Performed high-resolution absorption measurements in a heated static cell over a temperature range of 468–977 K.

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  • Analyzed absorption line ratios to determine temperature sensitivity.

    • Main Results:

    • The developed sensor successfully performed simultaneous temperature and H2O concentration measurements.
    • Selected H2O transitions demonstrated high sensitivity for temperature determination.
    • Measured line strengths were compared with HITRAN 96 database, showing good agreement and confirming suitability for temperatures from 450–2000 K.

    Conclusions:

    • The single diode laser absorption sensor is a viable tool for simultaneous temperature and H2O measurements.
    • The selected H2O transitions are well-suited for sensitive temperature monitoring in atmospheric pressure combustion systems.
    • The sensor's wide temperature applicability (450–2000 K) makes it valuable for combustion research and diagnostics.