Due to the wide use of laser systems in human activities, an accidental event of laser exposure may occur where the most susceptible part to injury is the eye. A typical invisible pulsed, far IR, CO2 laser beam was used as an intrabeam accidentally struck an eye leading to raise its temperature to a limit where a pain sensation was started followed by aversion response with a delay of 0.25 s. At this time, the laser beam was assumed to terminate with respect to the cornea. The finite element method (FEM) was used successfully to predict, numerically, the temperature distribution through the anterior part of the eye when subjected to the laser beam. The FEM program was written using Visual Basic 6 coding. The effects of laser parameters such as laser beam profile, pulse width, and repetition rate on the temperature distribution and the consequential thermal damage were studied. The efficiency of the constructed computer program of the present work was examined by the comparison of the predicted results with those obtained from previously published experimental and theoretical works. The comparison shows good agreements.

译文

:由于激光系统在人类活动中的广泛使用,在最容易受伤的部位是眼睛的地方,可能会发生激光暴露的意外事件。典型的不可见脉冲,远红外,CO2激光束被用作光束,意外地击中眼睛,导致其温度升高到极限值,在此极限处开始产生疼痛感,然后产生0.25 s的反感反应。此时,假设激光束相对于角膜终止。成功地使用了有限元方法(FEM),以数字方式预测了受到激光束照射时穿过眼睛前部的温度分布。 FEM程序是使用Visual Basic 6编码编写的。研究了激光参数(例如激光束轮廓,脉冲宽度和重复频率)对温度分布和随之而来的热损伤的影响。通过将预测结果与从先前发表的实验和理论著作中获得的预测结果进行比较,来检验所构建的计算机程序的效率。比较显示良好的协议。

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