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The step-change cooling performance of miniature thermoelectric module for pulse laser

机译：微型激光脉冲热电模块的阶跃冷却性能

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摘要

This article investigates a miniature thermoelectric module (MTEM) for pulse laser cooling. A step-changed cooling model is developed to predict the thermal performance of the MTEM. Interfacial effects of the MTEM are analyzed by considering the thermal non-equilibrium between electrons and phonons adjacent to thermoelectric/metal interface. Parametric studies were performed to analyze the effect of the pulse-width of laser, thermal resistance of hot-end heat exchanger, cooling load and the step-changed voltage on the system cooling performance. Particular attention is paid to the influence of scaling effect and supercooling effect on enhancing the miniature thermoelectric cooling (MTEC) performance. At a specific cooling load, the effects of pulse-changed and step-changed voltage on MTEC are numerically and experimentally studied. The MTEM can deal with not only the low cooling load of continuous laser, but also high cooling load of pulse laser which surpasses its' maximum cooling capacity. The transient response of cold-end temperature experiences an underdamped oscillation and finally reaching a steady-state value. A curve fitting equation for cold-end temperature is used to provide more accurate temperature and understand the temperature control strategy for pulse laser. The numerical result shows that the prediction by the model agrees well with the performance curve of datasheet and experimental data. It is also found that the voltage for achieving the maximum cooling capacity experiences step decrease with the increase of thermal resistance of hot-end heat exchanger.
机译：本文研究了用于脉冲激光冷却的微型热电模块（MTEM）。开发了逐步更改的冷却模型以预测MTEM的热性能。通过考虑与热电/金属界面相邻的电子和声子之间的热不平衡，分析了MTEM的界面效应。进行了参数研究，以分析激光的脉冲宽度，热端热交换器的热阻，冷却负载和阶跃变化电压对系统冷却性能的影响。要特别注意缩放效应和过冷效应对增强微型热电冷却（MTEC）性能的影响。在特定的冷却负载下，通过数值和实验研究了脉冲变化和阶跃变化的电压对MTEC的影响。 MTEM不仅可以处理连续激光器的低冷却负荷，而且可以处理超过其最大冷却能力的脉冲激光器的高冷却负荷。冷端温度的瞬态响应经历了阻尼不足的振荡，并最终达到稳态值。使用冷端温度曲线拟合方程式可提供更准确的温度并了解脉冲激光的温度控制策略。数值结果表明，该模型的预测结果与数据表和实验数据的性能曲线吻合良好。还发现，随着热端热交换器的热阻的增加，用于实现最大冷却能力的电压经历阶跃减小。

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