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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Measurement of acoustic reflection coefficients by an ultrasonicmicrospectrometer
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Measurement of acoustic reflection coefficients by an ultrasonicmicrospectrometer

机译：超声波光谱仪测量声反射系数

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An ultrasonic microspectrometer (UMSM) was developed in order tonevaluate the elastic properties of a solid specimen at a small spot onnits surface. In this system, spherical-planar-pair (SPP) lenses werenused, by which the acoustic reflection coefficient of a liquid/solidninterface was measured as a function of the incident angle in thenfrequency range from 20 to 140 MHz. Using a specimen of fused quartznwhose material constants were well known, the measurement accuracy wasnexamined. The phase velocity of a leaky Rayleigh wave was obtained fromnthe phase change of the reflection coefficient with 0.4% accuracy innthis frequency range. For a specimen of steel with a large acousticnattenuation, bulk attenuation factors and their frequency dependencenwere successfully estimated by computer-fitting of the reflectionncoefficient. As an example of anisotropic materials, the reflectionncoefficient of X-cut quartz was also measured. Measured phase of thenreflection coefficient was in good agreement with numerical calculation
机译：开发了超声显微光谱仪（UMSM），以便在固体表面上的一个小斑点上评估固体样品的弹性性能。在该系统中，使用球面平面（SPP）透镜，通过该透镜测量了液/固界面的声反射系数，该入射角是入射角在20至140 MHz频率范围内的函数。使用熔融石英的样品，其材料常数是众所周知的，其测量精度是耐克沙明。根据该频率范围内反射系数的相位变化，以0.4％的精度获得泄漏的瑞利波的相速度。对于具有较大声衰减的钢样品，通过计算机拟合反射系数成功地估算了体积衰减因子及其频率依赖性。作为各向异性材料的一个例子，还测量了X切石英的反射系数。反射系数实测相位与数值计算吻合良好

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