defect characterisation
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scholarly journals Defect characterisation using pulse compression-based quadratic frequency modulated thermal wave imaging

2020 ◽  
Vol 14 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Shaik Subhani ◽  
Gampa V.P. Chandra Sekhar Yadav ◽  
Venkata Subbarao Ghali
Keyword(s):  
Thermal Wave ◽  
Pulse Compression ◽  
Wave Imaging ◽  
Defect Characterisation ◽  
Thermal Wave Imaging

scholarly journals Multiple Wavemode Scanning for Near and Far-Side Defect Characterisation

2020 ◽  
Vol 39 (1) ◽  
Author(s):  
L Xiang ◽  
R S Edwards
Keyword(s):  
Rayleigh Waves ◽  
Wave Amplitude ◽  
Single Mode ◽  
Bulk Wave ◽  
Electromagnetic Acoustic Transducer ◽  
Face Surface ◽  
Scanning Method ◽  
Acoustic Transducer ◽  
Full Picture ◽  
Defect Characterisation

AbstractThe combination of ultrasonic inspections using different wavemodes can give more information than is available with single mode inspection. In this work, the response of shear and Rayleigh waves to surface-breaking defects propagating on the near-side and far-side of a sample is investigated. The directivity of shear waves generated by a racetrack coil electromagnetic acoustic transducer (EMAT) is identified and used to set an ideal separation for a pair of transmit-receive EMATs. Defects are indicated by a reduction in the transmitted Rayleigh wave amplitude, and by blocking of the shear wave. Used together, these can identify features in the bulk wave behaviour which are due to near-face surface-breaking defects, and give a full picture of both surfaces. By using a combination of the two wavemodes, the angle of propagation and length of any near-side defects can additionally be identified. A scanning method for samples is proposed.

scholarly journals Defect characterisation in Cu2ZnSnSe4 kesterites via resonance Raman spectroscopy and the impact on optoelectronic solar cell properties

2019 ◽  
Vol 7 (21) ◽  
pp. 13293-13304 ◽  
Author(s):  
Mirjana Dimitrievska ◽  
Florian Oliva ◽  
Maxim Guc ◽  
Sergio Giraldo ◽  
Edgardo Saucedo ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solar Cell ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Effective Technique ◽  
Resonant Raman ◽  
The Impact ◽  
Non Destructive ◽  
Defect Characterisation

UV-based resonant Raman spectroscopy is an effective technique for a non-destructive assessment of defects in kesterite materials.

scholarly journals Assessment methodology for defect characterisation using ultrasonic arrays

2018 ◽  
Vol 94 ◽  
pp. 126-136 ◽  
Author(s):  
Ali Safari ◽  
Jie Zhang ◽  
Alexander Velichko ◽  
Bruce W. Drinkwater
Keyword(s):  
Assessment Methodology ◽  
Ultrasonic Arrays ◽  
Defect Characterisation

scholarly journals Ultrasonic defect characterisation—Use of amplitude, phase, and frequency information

2018 ◽  
Vol 143 (1) ◽  
pp. 349-360 ◽  
Author(s):  
Long Bai ◽  
Alexander Velichko ◽  
Bruce W. Drinkwater
Keyword(s):  
Frequency Information ◽  
Defect Characterisation

scholarly journals Crystal structure and anti-site boundary defect characterisation of Cu2ZnSnSe4

2018 ◽  
Vol 6 (1) ◽  
pp. 189-197 ◽  
Author(s):  
B. G. Mendis ◽  
K. P. McKenna ◽  
G. Gurieva ◽  
M. S. Rumsey ◽  
S. Schorr
Keyword(s):  
Crystal Structure ◽  
Disorder Transition ◽  
Boundary Defect ◽  
Defect Characterisation

The crystal structure and anti-site boundaries in Cu2ZnSnSe4 are analysed at the nanometre scale on either side of the order–disorder transition.

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