A partial least squares and wavelet-transform hybrid model to analyze carbon content in coal using laser-induced breakdown spectroscopy

- We determined carbon content in coal using laser-induced breakdown spectroscopy.
- Wavelet transform method was applied for LIBS spectrum denoising.
- A partial least squares and wavelet-transform hybrid model was set up in the work.
- The hybrid model was applied in LIBS calibration model for the first time.
- The highest improvement of the calibration model was obtained in helium.