连续激光清除杂草马齿苋的理论与实验研究

Theoretical and Experimental Studies on Continuous Laser Removal of the Weed Amaranthus vulgaris

摘要: 针对受激光辐照的杂草茎部区域，结合多孔介质传热理论与Stefan条件，建立了激光与杂草相互作用的理论模型。对受到激光辐照后的杂草茎部的凹陷深度与温度开展了实验与仿真研究。结果表明：在连续激光辐照下，杂草茎部的凹陷深度随着功率密度的增加近似线性增长，且随着激光功率密度的增加，杂草中心区域的最高温度能更快的达到平台期。该模型能够模拟激光辐照杂草过程中杂草的最高温度与损伤程度，为研究激光与杂草的相互作用提供了一定的理论基础。

Abstract: A theoretical model of laser-weed interaction was developed by combining the theory of heat transfer through porous media and the Stefan condition for the region of weed stems irradiated by the laser. Experimental and simulation studies have been carried out to investigate the depression depth and temperature of weed stems after laser irradiation. The results show that under continuous laser irradiation, the depression depth of weed stems increases approximately linearly with the increase in power density, and the maximum temperature in the central region of the weed can reach the plateau more quickly with the increase in laser power density. The model can simulate the maximum temperature and damage degree of weeds during laser irradiation of weeds, which provides a certain theoretical basis for the study of the interaction between laser and weeds.