Validation of temperature imaging by H2O absorption spectroscopy using hyperspectral tomography in controlled...

Area of Science:

• Optical Engineering
• Thermodynamics
• Spectroscopy

Background:

• Accurate temperature measurement is crucial in various scientific and industrial applications.
• Traditional methods can be invasive or lack spatial resolution.
• Hyperspectral imaging offers potential for non-intrusive, high-fidelity measurements.

Purpose of the Study:

• To demonstrate and validate a novel temperature imaging technique using hyperspectral H2O absorption tomography.
• To assess the accuracy and sensitivity of the developed method in controlled experimental settings.
• To explore the potential of leveraging multispectral information for enhanced measurement fidelity.

Main Methods:

• Utilized hyperspectral H2O absorption tomography with 15 wavelengths across 30 laser beams.
• Reconstructed temperature images in a 381 mm × 381 mm plane containing a 102 mm × 102 mm internal zone with varying temperature.
• Employed controlled experiments to validate the technique's performance.

Main Results:

• Achieved average temperature image accuracies of 2.3% or better.
• Observed pixel-by-pixel standard deviations below 1%.
• Successfully detected a 4 K cooler internal zone with 98% statistical confidence.

Conclusions:

• Hyperspectral H2O absorption tomography is a viable technique for accurate temperature imaging.
• The method demonstrates high sensitivity and measurement fidelity, even for subtle temperature differences.
• This technique shows promise for non-intrusive thermal field characterization.