研究目的
Investigating the decay kinetics of thermal radiation emitted by surface layers of carbon materials under pulsed laser excitation to understand the material's properties at high temperatures.
研究成果
The decay kinetics of thermal radiation from carbon materials under pulsed laser excitation can be described by two exponential components. The slow component's decay time is determined by the ratio of the laser radiation's penetration depth to the thermal-diffusion length, offering a method to estimate the temperature conductivity coefficient of the material's surface layer at high temperatures.
研究不足
The study did not account for temperature dependences of material parameters and the influence of surface roughness on the glow-decay curve, which may affect the accuracy of the results.
1：Experimental Design and Method Selection:
The study used a Q-switched YAG:Nd3+ laser for excitation and an H1949-51 photomultiplier for detection. The decay curves were approximated by a sum of two exponential components.
2：Sample Selection and Data Sources:
Samples were fabricated from spectroscopic-grade carbon electrodes, with surfaces prepared either by polishing or cleaving.
3：List of Experimental Equipment and Materials:
Q-switched YAG:Nd3+ laser, H1949-51 photomultiplier, SS-4 colored-glass filter, TDS-2022B digital oscilloscope.
4：Experimental Procedures and Operational Workflow:
Samples were irradiated by a sequence of laser pulses, and the afterglow was detected and analyzed.
5：Data Analysis Methods:
The decay curves were analyzed using a sum of two exponential components, and computer simulation was used to model the heat conduction and radiation processes.
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