超声波显微镜sonscan

STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
Βιβλιοθήκη Baidu SKLMS 机械制造系统工程国家重点实验室
Ultrasound at Interfaces (界面处的超声波)
Reflected wave (反射波) Reflection Coefficient (R) (反射系数R) Transmitted wave (穿透波) Transmission Coefficient (T) (穿透系数T)
• The pressures generated at the focal spot are in the micro Joule range and are not harmful to even moderately delicate samples. • The pulse in the acoustic microscope has very low energy in comparison.
• Ultrasound is an elastic disturbance that propagates through materials (mainly solids and liquids) at frequencies above 20 KHz.
(超声波的频率在20KHz以上，人不能听到)
SKLMS 机械制造系统工程国家重点实验室
1. 超声波基础知识
2.超声波扫描微成像工作原理
3. 超声检测设备的参数和软件介绍
4. 超声波成像应用举例
5.超声波检测和X射线检测
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
(C-SAM使用的超声波的频率和能量不会对人体和样品有害。)
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
SKLMS 机械制造系统工程国家重点实验室
Ultrasound at Interfaces (界面处的超声波)
• When an ultrasound pulse impinges on an interface, part of the energy is reflected and part transmitted.
R (%) -100 -82 -87
T (%) 0 18 13
2Z 2 T Z 2 Z1
SKLMS 机械制造系统工程国家重点实验室
Acoustic Impedance of Materials (声阻抗值)
• Acoustic Impedance (Z) - is the product of a materials density times its ultrasonic velocity Z = V • In practical terms - Acoustic Impedance is a materials characteristic property that determines the amount of reflected and transmitted energy that occurs when an ultrasonic wave encounters a boundary or interface between two materials.
SKLMS 机械制造系统工程国家重点实验室
1、超声波基础知识
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
SKLMS 机械制造系统工程国家重点实验室
Basics of Ultrasound (超声波基础)
SOUND
ULF <20 Hz Audible 20 Hz – 20 KHz Ultrasound 20 KHz >
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
超声的应用：清洗, 焊接, 治疗, 成像和传感 超声波清洗和焊接：20KHz~40KHz
超声波成像：>5MHz
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
SKLMS 机械制造系统工程国家重点实验室
Basics of Ultrasound (超声波基础)
Z 2 Z1 R Z 2 Z1
11 Z
Material 1 Material 2 Plastic Air Ceramic Plastic Copper Plastic
Material 2 Z2
STATE KEY LABORATORY FOR MANUFACTURING SYSTEMS ENGINEERING
(在界面处超声波反射和穿过的相对强度是由界面两边物质的声阻抗决定的。)
• Acoustic Impedance (Z) - the product of the density of the material and the velocity of ultrasound (Z =V).
(声阻抗是物质的密度和超声波在该物质中的传播速度的乘积。)
• An ultrasonic wave cannot propagate through a vacuum at any frequency or through air at frequencies above 10 MHz.
(任何频率超声波都不能穿透真空。当超声波频率大于10MHz时，也不能穿透空气)
(在界面处的超声波，有些会被反射，有些会穿过该界面。)
• The relative strength of the transmitted (T) and reflected (R) ultrasound at an interface is governed by the acoustic impedance of the materials on each side of the interface.