通过脉冲受激热散射的差动外差探测法测定热弹性材料性能。

Determination of thermoelastic material properties by differential heterodyne detection of impulsive stimulated thermal scattering.

机构信息

Laboratory of Acoustics and Thermal Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium.

KU Leuven, Campus Brussels, Warmoesberg 26, B-1000 Brussels, Belgium.

出版信息

Photoacoustics. 2015 Jun 6;3(2):64-77. doi: 10.1016/j.pacs.2015.05.001. eCollection 2015 Jun.

DOI:10.1016/j.pacs.2015.05.001

PMID:26236643

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4519808/

Abstract

The underlying working principle of detecting impulsive stimulated scattering signals in a differential configuration of heterodyne diffraction detection is unraveled by involving optical scattering theory. The feasibility of the method for the thermoelastic characterization of coating-substrate systems is demonstrated on the basis of simulated data containing typical levels of noise. Besides the classical analysis of the photoacoustic part of the signals, which involves fitting surface acoustic wave dispersion curves, the photothermal part of the signals is analyzed by introducing thermal wave dispersion curves to represent and interpret their grating wavelength dependence. The intrinsic possibilities and limitations of both inverse problems are quantified by making use of least and most squares analysis.

摘要

通过涉及光学散射理论，揭示了在外差衍射检测的差分配置中检测脉冲受激散射信号的基本工作原理。基于包含典型噪声水平的模拟数据，证明了该方法在涂层-基底系统热弹特性表征方面的可行性。除了涉及拟合表面声波色散曲线的信号的光声部分的经典分析之外，还通过引入热波色散曲线来表示和解释它们的光栅波长依赖性，从而分析信号的光热部分。通过利用最小二乘和最大二乘分析，量化了这两个反问题的内在可能性和局限性。