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Short-range supercontinuum-based lidar for temperature profiling.

Abba Saleh, Antti Aalto, Piotr Ryczkowski

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    Summary
    This summary is machine-generated.

    This study introduces a novel light detection and ranging system for remote flue gas analysis. The system accurately measures temperature and concentration in combustion power plants using a supercontinuum source.

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    Area of Science:

    • Combustion diagnostics
    • Optical sensing technologies
    • Spectroscopy

    Background:

    • Accurate monitoring of flue gas parameters like temperature and concentration is crucial for optimizing combustion power plant efficiency and safety.
    • Traditional methods often require multiple access points or are limited in harsh environments.
    • Remote sensing offers a non-intrusive approach for in-situ measurements.

    Purpose of the Study:

    • To develop and demonstrate a short-range light detection and ranging (LiDAR) system for remote flue gas analysis.
    • To enable accurate measurement of temperature and concentration in combustion units with limited access.
    • To utilize a spectrally tailored supercontinuum source for differential absorption measurements.

    Main Methods:

    • A supercontinuum (SC) laser source was spectrally tailored to match ro-vibrational transition energies of flue gas components.
    • The system exploits differential absorption across specific wavelength bands within the SC spectrum.
    • Backscattered temporal intensity of SC pulses was analyzed to determine wavelength transmittance.
    • Water vapor temperature was measured in a laboratory furnace (400°C-900°C) using two wavelength bands.

    Main Results:

    • Demonstrated accurate remote measurement of water vapor temperature in a laboratory furnace.
    • The technique requires only a single inspection window, suitable for restricted access combustion units.
    • The system's capability for simultaneous temperature and concentration measurement was highlighted with multi-wavelength extension.
    • Potential for 3D profiling by varying the incident beam direction was shown.

    Conclusions:

    • The developed LiDAR system offers a robust and versatile solution for remote flue gas diagnostics.
    • The technique's ability to perform measurements with limited access and potential for multi-component analysis is significant for combustion power plant monitoring.
    • Further development can extend this method for comprehensive 3D mapping of gas parameters in industrial settings.