Precise measurements of bulk-wave ultrasonic velocity dispersion and attenuation in solid materials in the VHF range.
Precise measurements of bulk-wave ultrasonic velocity dispersion and attenuation in solid materials in the VHF range.
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在 VHF 范围内精确测量固体材料中的体波超声波速度色散和衰减。
DOI：
10.1121/1.1568756
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Arakawa
中科院分区：
文献类型：
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作者：
J. Kushibiki;R. Okabe;M. Arakawa
建立了一种利用复模测量法和衍射校正法精确测量甚高频（VHF）声损失固体试样的速度色散和衰减的通用方法。给出了实现该方法的实验步骤，并在50-230 MHz的频率范围内演示了该测量方法，使用硼硅玻璃（C-7740）作为色散样品，合成硅玻璃（C-7980）作为非色散标准样品。C-7980没有速度色散；速度为5929.14 +/- 0.03 m/s。C-7740表现出速度色散，从50 MHz时的5542.27 m/s到230 MHz时的5544.47 m/s，在测量频率范围内增加了约2 m/s。当衰减的频率依赖性表示为alpha = alpha(0)f（beta）时，结果如下：C-7980的alpha0 = 1.07 × 10(-16) s2/m和beta = 2， C-7740的alpha0 = 5.16 × 10(-9) s(1.25)/m和beta = 1.25。
A general method was established for precisely measuring velocity dispersion and attenuation in solid specimens with acoustic losses in the very high frequency (VHF) range, using the complex-mode measurement method and the diffraction correction method. Experimental procedures were presented for implementing such a method and demonstrated this measurement method in the frequency range of 50-230 MHz, using borosilicate glass (C-7740) as a dispersive specimen and synthetic silica glass (C-7980) as a nondispersive standard specimen. C-7980 exhibited no velocity dispersion; velocity was constant at 5929.14 +/- 0.03 m/s. C-7740 exhibited velocity dispersion, from 5542.27 m/s at 50 MHz to 5544.47 m/s at 230 MHz with an increase of about 2 m/s in the measured frequency range. When frequency dependence of attenuation was expressed as alpha = alpha(0)f(beta), the results were as follows: alpha0 = 1.07 x 10(-16) s2/m and beta = 2 for C-7980 and alpha0 = 5.16 x 10(-9) s(1.25)/m and beta = 1.25 for C-7740.
VHF/UHF范围生物超声波光谱系统和方法
DOI：
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发表时间：
2006
期刊：
影响因子：
--
作者：
N. Akashi;M. Arakawa;H. Odagawa;T. Sannomiya;J. Kushibiki;N. Chubachi,and F. Dunn
通讯作者：
N. Chubachi,and F. Dunn