1. According to the M1L-STD-883C standard of thermal cycle loading, the delamination propagation rates at the interface between chip and underfill were studied experimentally by using C-mode scanning acoustic microscope (C-SAM) for two types of flip chip packages with different states of solder joint.
1. According to the M1L-STD-883C standard of thermal cycle loading, the delamination propagation rates at the interface between chip and underfill were studied experimentally by using C-mode scanning acoustic microscope (C-SAM) for two types of flip chip packages with different states of solder joint.
Presented a system architecture of 200 MHz high-speed data acquisition card based on PCI bus,which can be used in the industrial 20 MHz ultrasonic microscope.
This article describes some important applications of ultrasonic microscope to metallic/nonmetallic materials. Observations were made on surface and subsurface structures and defects,then determinethe values of elasticity and fracture toughness,etc . on the basis of observation results.
The results show that acoustic microscopy can clearly image the structure of normal aortic wall and atheroma plaques. The Vs of F was significantly smaller than N(P<0 001),while the Vs of FS and CA were significantly larger than N(P<0 001).
The properties of GaInAsSb epilayers were characterized by the X-ray double crystal diffraetion, the photoluminescence, the infrared absorption and scanning electron acoustic microscopy. The spectral responses of p+-GaInAsSb/p-GaInAsSb /n-GaSb detectors showed wavelength cutting off at 2. 4μm and detectivity D*=1×109cm Hz(1/2)/W.
A concept of a scanning acoustic microscope with a harmonic sounding signal for measuring the parameters of local homogeneous regions of flat samples is proposed.
A concept of a scanning acoustic microscope with a harmonic sounding signal for measuring the parameters of local homogeneous regions of flat samples is proposed.
A 27 MHz transducer, mounted on an ultrasonic microscope, was used to quantify the dependence of backscatter power on the angle of incidence of arterial vessels.
The elastic properties of C60 fullerite samples synthesized under pressure P=13.0 GPa at high temperatures were investigated using acoustic microscopy.
The feasibility of applying atomic-force acoustic microscopy to measure the elastic properties of thin-film coatings and their thickness in the range from several to several hundreds of nanometers is studied.
Numerical simulation is used to evaluate the thickness and indentation modulus of a coating from contact stiffness kcont measured by atomic-force acoustic microscopy.
In this paper,the operating principle of scanning laser acoustic microscope andthe application of this technique to detecting defects in ceramics are presented.On thebasis of acoustic images of defects,the method of determining the size,location andcharacter of the defects is discussed.The experimental results of detecting defects invarious ceramics show that high frequency ultrasonic (100 MHz) can be used to de-tect the defects smaller than 100μm.
ZnO thin film transducers have been developed for nondestructive testing ofceramic materials.In this case,bulk wave transducers seem to be more significant.The basic aim of this work lies in extending the ultrasonic pulse echo measurementup to the frequencies of 150-400 MHz.By means of this method,the defects assmall as 100 μm in fine ceramics,such as SiC,Si_3N_4 and ZrO_2,can be easily dete-cted.Furthermore,the position and shape of the defects in ceramics can be deter-mined accurately.It appears to be sup...
本文主要研究 ZnO 薄膜换能器在无损评价中的应用。ZnO 薄膜的体波换能器已经研制成功。本工作的目的是把超声脉冲回波测量技术用到150～400MHz 的高频范围。用这种测量技术可以测定精细陶瓷(如 SiC、Si_3N_4、ZrO_2)中100μm 的缺陷,并可定量地确定缺陷的位置和形状。与 X 射线及激光扫描超声显微镜相比有其独特的优点。
超声显微镜
acoustic microscope
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