Mathematical treatment of heat flow in differential scanning calorimetry and differential thermal analysis instruments
Mathematical treatment of heat flow in differential scanning calorimetry and differential thermal analysis instruments
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差示扫描量热和差热分析仪器中热流的数学处理
DOI：
10.1063/1.1136933
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
S. Mraw
中科院分区：
文献类型：
--
作者：
S. Mraw
给出了与经典差示热分析、功率补偿差示扫描量热法和热流差示扫描量热法相关的一般数学处理。一个理想化的系统，代表几乎任何类型的差热仪器，提出，其中，不同于以前的治疗，包括两个单独的热阻。这种修改允许热通量d.s.c.在与其他技术的统一分析中考虑仪器。一般方面的理想化系统，和控制系统内的热流方程的开发。对于每一种单独的技术，将理想化系统的组件与物理仪器的实际组件相识别，并导出描述该技术的测量原理的特定方程。结果表明，一个类似类型的热阻控制样品的温度滞后的功率补偿和热补偿。
A general mathematical treatment is given which relates the techniques of classical differential thermal analysis, power‐compensated differential scanning calorimetry, and heat‐flux differential scanning calorimetry. An idealized system, representative of almost any type of differential thermal instrument, is presented, which, unlike those of previous treatments, incorporates two separate thermal resistances. This modification allows the heat‐flux d.s.c. instrument to be considered in a unified analysis with the other techniques. General aspects of the idealized system are presented, and the equations governing heat flow within the system are developed. For each separate technique, the components of the idealized system are identified with the actual components of the physical instrument, and the specific equations which describe the measuring principles of that technique are derived. It is shown that a similar type of thermal resistance governs sample‐temperature lag in both the power‐compensated and hea...