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Mid-Infrared Reflectance Spectroscopy Based on External Cavity Quantum Cascade Lasers for Mineral Characterization
Francis Vanier1, Anaïs Parrot1, Christian Padioleau1
1Energy, Mining and Environment, Ringgold:%206356National Research Council Canada, Boucherville, QC, Canada.
Applied Spectroscopy
|February 12, 2022
Summary
Tunable external cavity quantum cascade lasers enable effective mineral characterization via mid-infrared reflectance spectroscopy. This technique accurately identifies minerals and their mixtures, even under varying field conditions.
Area of Science:
- Geoscience
- Spectroscopy
- Laser Technology
Background:
- Mineral identification is crucial for geological surveys and resource exploration.
- Mid-infrared spectroscopy offers unique spectral fingerprints for mineral analysis.
- External cavity quantum cascade lasers (EC-QCLs) provide tunable mid-infrared light sources.
Purpose of the Study:
- To present mineral characterization using tunable EC-QCLs for mid-infrared reflectance spectroscopy.
- To demonstrate the technique's applicability to common minerals and their mixtures.
- To evaluate the method's performance under simulated field conditions.
Main Methods:
- Utilized tunable external cavity quantum cascade lasers (EC-QCLs).
- Acquired mid-infrared reflectance spectra of common minerals.
- Performed measurements at various incident angles.
- Analyzed spectra from mineral mixtures.
Main Results:
- Obtained distinct reflection spectra for common minerals, showing spectral variations.
- Demonstrated successful spectral acquisition at different incident angles, simulating field conditions.
- Successfully characterized mineral mixtures, assessing the technique's quality and usability.
Conclusions:
- Tunable EC-QCLs are effective for mineral characterization using mid-infrared reflectance spectroscopy.
- The technique is robust and applicable to diverse mineral samples, including mixtures.
- The method shows promise for in-situ geological applications.
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