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Thermal behavior of materials in laser-assisted extreme manufacturing: Raman-based novel characterization
International Journal of Extreme Manufacturing ( IF 14.7 ) Pub Date : 2020-08-04 , DOI: 10.1088/2631-7990/aba17c
Ridong Wang 1 , Shen Xu 2 , Yanan Yue 3 , Xinwei Wang 4
Affiliation  

Laser-assisted manufacturing (LAM) is a technique that performs machining of materials using a laser heating process. During the process, temperatures can rise above over 2000 C. As a result, it is crucial to explore the thermal behavior of materials under such high temperatures to understand the physics behind LAM and provide feedback for manufacturing optimization. Raman spectroscopy, which is widely used for structure characterization, can provide a novel way to measure temperature during LAM. In this review, we discuss the mechanism of Raman-based temperature probing, its calibration, and sources of uncertainty/error, and how to control them. We critically review the Raman-based temperature measurement considering the spatial resolution under near-field optical heating and surface structure-induced asymmetries. As another critical aspect of Raman-based temperature measurement, temporal resolution is also reviewed to cover various ways of realizing ultrafast thermal probing. We conclude with a detailed outlook on Raman-based temperature probing in LAM and issues that need special attention.



中文翻译:

激光辅助极端制造中材料的热行为:基于拉曼的新颖表征

激光辅助制造(LAM)是一种使用激光加热工艺对材料进行机加工的技术。在此过程中,温度可能会升高到2000 C以上。因此,至关重要的是探索这种高温下材料的热行为,以了解LAM背后的物理原理并为制造优化提供反馈。拉曼光谱被广泛用于结构表征,可以提供一种在LAM期间测量温度的新颖方法。在这篇综述中,我们讨论了基于拉曼的温度探测机制,其校准,不确定性/误差源以及如何控制它们。考虑到近场光学加热下的空间分辨率和表面结构引起的不对称性,我们严格审查了基于拉曼的温度测量。作为基于拉曼的温度测量的另一个关键方面,还对时间分辨率进行了综述,以涵盖实现超快速热探测的各种方法。最后,我们对LAM中基于拉曼的温度探测以及需要特别注意的问题作了详细的展望。

更新日期:2020-08-04
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