研究目的
Investigating the spatial molecular AlO temperature distributions in laser-induced plasma using spatially resolved, line-of-sight measurements of aluminum monoxide emission spectra with Abel inversion techniques.
研究成果
Asymmetric Abel deconvolutional methods can be applied to obtain spatial information of molecular spectra in laser ablation plasma plumes. The impact that the propagating shockwave has on the plasma state in both radial and axial directions was demonstrated, showing multiple temperature gradients corresponding to the leading/following edges of the plasma blast wave.
研究不足
The largest source of error in the deconvolution procedure results from considering too small of a radius or applying the deconvolution to too small of an axial region. Edge effects and noisy nature of the deconvolution procedure are also limitations.
1：Experimental Design and Method Selection:
The experiment involved laser ablation plasma initiated in ambient laboratory air using a Quantel Ultra Light Q-switched Nd:YAG laser. Spectra were collected and analyzed using Abel inversion techniques to extract radial plasma temperatures.
2：Sample Selection and Data Sources:
The ablation target was the narrow edge of a 5 cm square aluminum alloy 6061 sheet. Spectra were the result of 100 accumulations on a single ablation site.
3：List of Experimental Equipment and Materials:
- Quantel Ultra Light Q-switched Nd:YAG laser
4：Experimental Procedures and Operational Workflow:
Spectra were imaged onto the slit of the spectrometer, and spatially and temporally resolved spectral images were recorded using the ICCD. The system was calibrated for wavelength and intensity response.
5：Data Analysis Methods:
Temperatures were determined by fitting simulated AlO spectra to the line-of-sight measurements and radially deconvolved spectra using a Trust-Region fitting routine.
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