不同脉冲激光功率下生物组织温度场数值仿真研究

激光以其优异的性能广泛应用于医学和军事领域。为有效防护激光过度损伤,需研究激光与生物组织的热作用机理。本文分析了激光与生物组织作用的热传递数学模型,讨论了组织的边界条件,建立了皮肤生物组织的三层有限元网格模型,给出了采用ANSYS软件进行组织温度场求解的流程,数值仿真研究了不同功率脉冲激光在皮肤组织内部产生的温度场特性,得出了组织内部不同径向长度、轴向深度在不同时刻下的温度场变化趋势。结果表明,激光功率几何倍增时,组织内部的最大温升呈几何倍增趋势;条件一定时,组织温升区域不随激光功率变化而变化。随着激光功率增加,生物组织表层温度变化的剧烈程度增大,而内部温度变化的剧烈程度较小,且随着轴向深度增加,组织内部温度逐渐呈线性趋势。

Numerical Simulation Study of Temperature Distribution in Bio-tissue Generated by Different Power Pulse Laser

Laser is widely applied in military and medicine fields because of its excellent capability. In order to effectively defend excess damage by laser, the thermal processing theory of skin tissue generated by laser should be carried out. The mathematics model of bio-tissue heat transfer that is irradiated by laser is analyzed. And boundary conditions of bio-tissue are discussed. Three layer FEM grid model of bio-tissue is established. The solving flow of temperature in tissue is given by adopting ANSYS software. The temperature distribution characteristic of skin tissue generated by different power pulse laser is numerical simulated. The different times temperature change trend in different radial length and axis depth skin tissue is educed. The results show that the biggest temperature ascend in bio-tissue is increasing geometry doubly with the laser power increase geometry doubly. When the conditions are the same, the area of temperature ascend in bio-tissue doesn＇t change with laser power changing. The acuity degree of temperature change on the surface layer bio-tissue increase with laser power increasing. But the acuity degree of temperature change inner bio-tissue is less. The temperature in bio-tissue assume linearity trend with axis depth increasing.