ACOUSTIC MICROSCOPE OPERATING AT 100 MHZ
ACOUSTIC MICROSCOPE OPERATING AT 100 MHZ
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DOI：
10.1038/232110a0
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发表时间：
1971-01-01
期刊：
影响因子：
64.8
通讯作者：
PALERMO, PR
中科院分区：
文献类型：
--
作者：
KORPEL, A;KESSLER, LW;PALERMO, PR
声学显微镜的概念并不新鲜，但建造工作装置的方法现在才变得可行2，3。由于声学显微镜依靠的是机械振动，而不是电磁辐射，所以有可能观察到用传统方法无法检测到的样品的特征。在所有已知的材料中，声音的传播速度比光的传播速度低，导致在给定的激励频率下，波长相应地减小。声学显微镜在理论上可达到的分辨率受到角度孔径和波长的限制，其方式完全类似于光学情况。目前的超声波技术将可达到的上限频率限制在10 GHz左右，这相当于大多数固体的波长为3000-6000？，而大多数液体的波长为1000-2000？
THE concept of acoustic microscopy is not new1, but the means for constructing a working device are only now becoming available2,3. As acoustic microscopy relies on mechanical vibration, rather than electromagnetic radiation, it may be possible to visualize features of a specimen which go undetected by conventional methods. The lower propagation velocity of sound compared with that of light, in all known materials, results in a corresponding reduction in wavelength for a given frequency of excitation. The theoretically attainable resolution with acoustic microscopy is limited by the angular aperture and the wavelength in a manner entirely analogous to the optical situation. Present ultrasonic technology limits the upper frequency attainable to about 10 GHz which corresponds to a wavelength of 3000–6000 Å in most solids and 1000–2000 Å in most liquids.