论文标题
使用瞬态光谱光谱法对热扩散率和表面声波速度的非连接，非破坏性映射
Non-contact, non-destructive mapping of thermal diffusivity and surface acoustic wave speed using transient grating spectroscopy
论文作者
论文摘要
我们提出了激光诱导的瞬时光光谱（TGS）技术的新发展，该技术可以测量大面积的2D热扩散率和表面声波速度。其他功能包括有针对性的测量以及可容纳表面粗糙度增加的样品的能力。通过记录大量的氘植入钨，线性摩擦焊接航空合金和具有各种晶粒尺寸的高熵合金的TGS图，可以证明这些新功能。结果说明了在弹性各向异性样品中查看晶粒微观结构的能力，并在样品中检测出异常的能力，例如由于照射和先前的测量值。他们还指出了使用TGS量化多晶材料表面的晶粒尺寸的可能性。
We present new developments of the laser-induced transient grating spectroscopy (TGS) technique that enable the measurement of large area 2D maps of thermal diffusivity and surface acoustic wave speed. Additional capabilities include targeted measurements and the ability to accommodate samples with increased surface roughness. These new capabilities are demonstrated by recording large TGS maps of deuterium implanted tungsten, linear friction welded aerospace alloys and high entropy alloys with a range of grain sizes. The results illustrate the ability to view grain microstructure in elastically anisotropic samples, and to detect anomalies in samples, for example due to irradiation and previous measurements. They also point to the possibility of using TGS to quantify grain size at the surface of polycrystalline materials.
