High sensitivity non-contact method for dynamic quantification of elastic waves and strains in transparent media
High sensitivity non-contact method for dynamic quantification of elastic waves and strains in transparent media
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DOI：
10.1016/j.measurement.2014.04.038
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发表时间：
2014-09
期刊：
影响因子：
5.6
通讯作者：
R. Malkin;D. Robert
中科院分区：
文献类型：
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作者：
R. Malkin;D. Robert
本文提出了固体介质中弹性应力波的时间分辨定量评价，采用了一种完善的激光多普勒振动测量方法。我们表明，在透明介质中引入弹性应力波会引起折射率的可检测和可量化的变化，折射率与应力成正比。该方法在丙烯酸棒中进行了频率为10至25 kHz的机械激励测试。这种折射定量可以测量低至1 × 10−11的内部应变。此外，还进行了有限元分析，以衡量结果的有效性。在本作品中使用了丙烯酸棒，但这种方法应该适用于任何透明固体。
This paper presents time resolved quantitative evaluation of elastic stress waves in solid media by utilising an adaptation of the well-established laser Doppler vibrometry method. We show that the introduction of elastic stress waves in a transparent medium gives rise to detectable and quantifiable changes in the refractive index, which is proportional to stress. The method is tested for mechanical excitation at frequencies from 10 to 25 kHz in an acrylic bar. This refractometric quantification can measure internal strains as low as 1 × 10−11. Additionally, finite element analysis is conducted to gauge the validity of the results. In the presented work an acrylic bar is used, this method however should be applicable to any transparent solid.