远距离光热爆炸物探测系统中的Laser粒子加热过程
Laser Particle Heating Process in a Stand-off Photo-thermal Explosive Detection System
摘要：
最近的出版物描述了一种使用共振红外光热成像对爆炸物进行远距离光学检测的方法。这种技术使用调谐激光器来选择性地加热位于基底表面上的炸药小颗粒。然后使用热红外成像检测这些加热颗粒的存在。虽然该方法已被实验证明，没有足够的理论分析的激光加热和随后的粒子冷却已经开发。本文提供了这些过程的分析描述，这是必要的了解和优化的爆炸物检测系统的操作参数。粒子和衬底温度的微分方程推导和解决拉普拉斯变换域。结果被用来描述在实验过程中测量的无法解释的冷却现象。一个极限粒子温度导出作为实验参数的函数。辐射和自然对流冷却的粒子和不均匀的粒子温度的影响进行了检查，发现是可以忽略不计的。使用的分析模型的计算与实验测量进行比较。在附录中包括了对基板的热接触加热的分析。
英文摘要：
Recent publications have described a method for stand-off optical detection of explosives using resonant infra-red photothermal imaging. This technique uses tuned lasers to selectively heat small particles of explosive lying on a substrate surface. The presence of these heated particles is then detected using thermal infra-red imagery. Although the method has been experimentally demonstrated, no adequate theoretical analysis of the laser heating and subsequent particle cooling has been developed. This paper provides the analytical description of these processes that is necessary to understand and optimize the operational parameters of the explosive detection system. The differential equations for particle and substrate temperatures are derived and solved in the Laplace transform domain. The results are used to describe unexplained cooling phenomena measured during the experiments. A limiting particle temperature is derived as a function of experimental parameters. The effects of radiative and natural convection cooling of the particle and of non-uniform particle temperature are examined and found to be negligible. Calculations using the analytical model are compared with experimental measurements. An analysis of thermal contact heating of the substrate is included in the appendix.
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