scholarly journals Nondestructive characterization of polycrystalline 3D microstructure with time-domain Brillouin scattering

2019 ◽  
Vol 166 ◽  
pp. 34-38 ◽  
Author(s):  
Yuzhou Wang ◽  
David H. Hurley ◽  
Zilong Hua ◽  
Gaofeng Sha ◽  
Samuel Raetz ◽  
...  
Keyword(s):  
Time Domain ◽  
Brillouin Scattering ◽  
3D Microstructure ◽  
Nondestructive Characterization

scholarly journals 3D characterization of individual grains of coexisting high-pressure H2O ice phases by time-domain Brillouin scattering

2021 ◽  
Vol 130 (5) ◽  
pp. 053104
Author(s):  
Sathyan Sandeep ◽  
Théo Thréard ◽  
Elton De Lima Savi ◽  
Nikolay Chigarev ◽  
Alain Bulou ◽  
...  
Keyword(s):  
High Pressure ◽  
Time Domain ◽  
Brillouin Scattering ◽  
Individual Grains

scholarly journals Terahertz time-domain ellipsometry with high precision for the evaluation of GaN crystals with carrier densities up to 1020 cm−3

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Verdad C. Agulto ◽  
Toshiyuki Iwamoto ◽  
Hideaki Kitahara ◽  
Kazuhiro Toya ◽  
Valynn Katrine Mag-usara ◽  
...  
Keyword(s):  
Electrical Properties ◽  
High Voltage ◽  
Time Domain ◽  
High Frequency ◽  
Carrier Density ◽  
Power Devices ◽  
Reflection Configuration ◽  
Nondestructive Characterization ◽  
Thz Waves

AbstractGallium nitride (GaN) is one of the most technologically important semiconductors and a fundamental component in many optoelectronic and power devices. Low-resistivity GaN wafers are in demand and actively being developed to improve the performance of vertical GaN power devices necessary for high-voltage and high-frequency applications. For the development of GaN devices, nondestructive characterization of electrical properties particularly for carrier densities in the order of 1019 cm−3 or higher is highly favorable. In this study, we investigated GaN single crystals with different carrier densities of up to 1020 cm−3 using THz time-domain ellipsometry in reflection configuration. The p- and s-polarized THz waves reflected off the GaN samples are measured and then corrected based on the analysis of multiple waveforms measured with a rotating analyzer. We show that performing such analysis leads to a ten times higher precision than by merely measuring the polarization components. As a result, the carrier density and mobility parameters can be unambiguously determined even at high conductivities.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

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