Surface Wave Technique at Millimeter Waveband for Semiconductor Testing by Photoexcitation

2019 ◽  
Author(s):  
Alexey Vertiy ◽  
Sergey Mizrakhy ◽  
Alexander Uzlenkov ◽  
Peter Ersland ◽  
Sam Mil'shtein
Keyword(s):  
Surface Wave ◽  
Millimeter Waveband ◽  
Wave Technique

Quantitative assessment of scleroderma by surface wave technique

2011 ◽  
Vol 33 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Xiaoming Zhang ◽  
Thomas G. Osborn ◽  
Mark R. Pittelkow ◽  
Bo Qiang ◽  
Randall R. Kinnick ◽  
...  
Keyword(s):  
Surface Wave ◽  
Quantitative Assessment ◽  
Wave Technique

Quality Monitoring of Thermally Degraded Stationary Gas Turbine Blade Material by Surface Wave Technique

2005 ◽  
Vol 297-300 ◽  
pp. 1998-2003
Author(s):  
Jai Won Byeon ◽  
C.S. Kim ◽  
J.H. Song ◽  
S.I. Kwun
Keyword(s):  
Surface Wave ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Wave Velocity ◽  
Quality Monitoring ◽  
Near Surface ◽  
Surface Wave Velocity ◽  
Surface Damages ◽  
Wave Technique ◽  
Degradation Time

For the quality monitoring and reliable application of stationary gas turbine blade (vane), near surface damages in the isothermally degraded vein material (i.e., cobalt based superalloy) were characterized by ultrasonic surface wave technique. Surface wave velocity and attenuation were measured for the artificially degraded specimens at 1100°C, together with microstructural analysis and micro-hardness measurement. Surface wave velocity increased with thermal degradation time, which was attributed to the increasing depletion of solute chromium near the surface. Strong frequency dependence of surface wave velocity was observed in the specimens with surface depletion layer. Attenuation coefficient of surface wave increased with increasing degradation time. The potential of ultrasonic surface wave technique to assess near surface damages in vein material was discussed with an emphasis on the relationship between the microstructural damage and the governing principles of ultrasonic response.

scholarly journals Seismic Surface Wave Testing for Investigating the Shallow Soil Profile

2015 ◽  
Vol 773-774 ◽  
pp. 1565-1568 ◽  
Author(s):  
Zainudin Siti Zuraidah ◽  
Aziman Madun ◽  
Joret Ariffuddin ◽  
L.A. Mohammad Faiz
Keyword(s):  
Surface Wave ◽  
Soil Profile ◽  
Shear Test ◽  
Seismic Velocity ◽  
Seismic Energy ◽  
Testing System ◽  
Wave System ◽  
Shallow Soil ◽  
Vane Shear Test ◽  
Wave Technique

This research explores the use of the seismic surface wave technique which is called as a spectral analysis of surface wave (SASW) for investigating the shallow soil profile. The testing was conducted on soft ground located at Universiti Tun Hussein Onn Malaysia (UTHM). The testing was conducted using a new developed in-house seismic surface wave testing system. An impact source using 5 kg hammer is used to generate seismic energy and four differencesarrangement of the source to receiver distances to produce soil profile. The profile of phase velocity was obtained at a depth of 0.15 m to 1.8 m were between 68 m/s and 95 m/s. The results were calibrated with the hand vane shear test which is used to obtain the undrained shear strength and thus converted empirically to seismic velocity at 45 m/s and 95 m/s. The result shows good agreement between velocity obtained from the surface wave testing system and hand vane shear test. Therefore, the new developed in-house seismic surface wave system has been proven can be used to determine the seismic velocity at shallow depth.

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