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Scanning Acoustic Microscope(SAM)
超声波扫描显微镜
Scanning Acoustic Microscope(SAM)超声波扫描显微镜H.S. Jang
2What is Ultrasonics ?什么是超声波What is Ultrasonics ?什么是超声波•Sound waves which have a frequency over 20kHz. 频率超过20Khz 的声波 (Audible frequency: 16Hz -20kHz) (人耳能人耳能听听到的声音频率为:16Hz-20kHz)•The sound waves which can not be heard by the human ear .超声波是人耳波是人耳听听不到的16Hz -20,000Hz
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Types of Ultrasonic Waves 超声波的波形
Types of Ultrasonic Waves 超声波的波形1. Shear Wave(横波)
1)The vibration direction and propagation direction are
什么是lomo八下英语作业本答案浙教版perpendicular .
振幅方向和传播方向是垂直的
2)Transmission in liquid or air is impossible.
2011考研英语真题在液在液体体和空气中无法传播
Vibration Propagation
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Types of Ultrasonic Waves 超声波的波形
Types of Ultrasonic Waves 超声波的波形2. Longitude Wave (纵波)
1)The vibration direction and propagation direction are same .
振幅方向和传播方向是一致的
2)Transmission in liquid is possible.
可以在液可以在液体体中传播
Propagation
Vibration
5Characteristics of Ultrasonics 超声波的特性
Characteristics of Ultrasonics 超声波的特性1.100% reflection when it meets air(delamination)怎样做到心无旁骛
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碰到空气(分层或离层)100%反射
2.Reflects at interfaces
在任何界面会反射
nba季后赛主题曲3. Travels straight as light becau of the very short wavelength.
吸血鬼日记播出时间由于它的波长非常短, 所以和光线一样直线传播
50%
50%Air
100%
Die EMC
