Ogi H, Nakamura N, Hirao M, Ledbetter H
Graduate School of Engineering Science, Osaka University, Machikaneyama 1-3, Toyonaka, Osaka 560-8531, Japan.
Ultrasonics. 2004 Apr;42(1-9):183-7. doi: 10.1016/j.ultras.2004.01.007.
We describe an advanced methodology to determine all the independent elastic-stiffness coefficients Cijkl, the associated internal frictions Qijkl(-1), and piezoelectric coefficients eijk of piezoelectric materials from a single monocrystal specimen using resonant-ultrasound spectroscopy with laser-Doppler interferometry. The mechanical-resonance frequencies of a piezoelectric solid depend on all of the elastic and piezoelectric coefficients, and their accurate measurement allows one to determine the elastic and piezoelectric coefficients simultaneously. Resonance-peak-width measurements yield the internal-friction tensor. Successful determination requires correct vibration-mode identification for the observed resonance frequencies. This is achieved unambiguously by measuring deformation distributions on the vibrating-specimen surface with laser-Doppler interferometry and comparing them with calculated displacement distributions. The methodology is applied to lithium niobate (LiNbO3) and langasite (La3Ga5SiO14) crystals.
我们描述了一种先进的方法，该方法利用共振超声光谱结合激光多普勒干涉测量技术，从单个单晶样品中确定压电材料的所有独立弹性刚度系数Cijkl、相关的内耗Qijkl(-1)以及压电系数eijk。压电固体的机械共振频率取决于所有弹性和压电系数，对其进行精确测量可使人们同时确定弹性和压电系数。共振峰宽测量可得到内耗张量。成功的测定需要对观测到的共振频率进行正确的振动模式识别。通过用激光多普勒干涉测量法测量振动样品表面的变形分布并将其与计算出的位移分布进行比较，可明确实现这一点。该方法应用于铌酸锂（LiNbO3）和硅酸镧镓（La3Ga5SiO14）晶体。
