Simultaneous retrieval of temperature-dependent absorption coefficient and conductivity of participating media
Simultaneous retrieval of temperature-dependent absorption coefficient and conductivity of participating media
复制标题
同时检索参与介质的温度相关吸收系数和电导率
DOI：
10.1038/srep21998
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发表时间：
2016-02-25
影响因子：
4.6
通讯作者：
Tan, Heping
中科院分区：
文献类型：
--
作者：
Ren, Yatao;Qi, Hong;Tan, Heping
提出了二次优化技术来估计与温度相关的热导率和吸收系数。在所提出的方法中，应用随机粒子群优化来求解反问题。耦合辐射和传导问题在暴露于脉冲激光的一维吸收、发射但非散射平板中得到解决。研究发现，在辐射和传导耦合问题中，温度响应对电导率高度敏感，但对光学特性稍敏感。相反，辐射强度对光学性质高度敏感，但对热导率稍敏感。因此，在反演问题中应同时考虑光信号和热信号，以估计透明介质的温度相关特性。在此基础上，通过测量随时间变化的温度和板边界的辐射响应，可以准确估计随温度变化的热导率和吸收系数。
A secondary optimization technique was proposed to estimate the temperature-dependent thermal conductivity and absorption coefficient. In the proposed method, the stochastic particle swarm optimization was applied to solve the inverse problem. The coupled radiation and conduction problem was solved in a 1D absorbing, emitting, but non-scattering slab exposed to a pulse laser. It is found that in the coupled radiation and conduction problem, the temperature response is highly sensitive to conductivity but slightly sensitive to the optical properties. On the contrary, the radiative intensity is highly sensitive to optical properties but slightly sensitive to thermal conductivity. Therefore, the optical and thermal signals should both be considered in the inverse problem to estimate the temperature-dependent properties of the transparent media. On this basis, the temperature-dependent thermal conductivity and absorption coefficient were both estimated accurately by measuring the time-dependent temperature, and radiative response at the boundary of the slab.