Bolt looseness detection based on ultrasonic wavefield energy analysis using an Nd:YAG pulsed laser scanning system

2020 ◽  
Vol 27 (9) ◽  
Author(s):  
Kassahun Demissie Tola ◽  
Changgil Lee ◽  
Jooyoung Park ◽  
Ju‐Won Kim ◽  
Seunghee Park
Keyword(s):  
Laser Scanning ◽  
Energy Analysis ◽  
Pulsed Laser ◽  
Scanning System ◽  
Laser Scanning System

scholarly journals Determination of Plate Corrosion Dimension Using Nd:YAG Pulsed Laser-generated Wavefield and Experimental Dispersion Curves

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1436
Author(s):  
Kassahun Demissie Tola ◽  
Dai Quoc Tran ◽  
Byoungjoon Yu ◽  
Seunghee Park
Keyword(s):  
Laser Scanning ◽  
Pulsed Laser ◽  
Corrosion Damage ◽  
Dispersion Curves ◽  
Scanning System ◽  
Post Processing ◽  
Host Structure ◽  
Laser Scanning System ◽  
Experimental Dispersion

Corrosion detection using a pulsed laser scanning system can be performed via ultrasonic wave propagation imaging. This method outputs illustrations of the wave field within the host structure; thus, it can depict wave–corrosion area interactions. Additionally, post-processing can be performed to enhance the visualization of corroded areas. The wavefield energy computed using RMS (Root Mean Square) is a validated post-processing tool capable of displaying the location and area of corrosion-damaged regions. Nonetheless, to characterize corrosion, it is necessary to determine its depth. The measurement of depth in conjunction with that of the corroded area via the RMS distribution enables the determination of all dimensions of corrosion damage. Thereafter, the flaw severity can be evaluated. This study employed a wavefield within a plate on which corrosion was developed artificially to generate frequency–wavenumber dispersion curves. The curves were compared with their counterparts from a corrosion-free plate. Alternatively, they could be compared with dispersion curves drawn using the depth and material properties of a pristine plate via a computer program. Frequency–wavenumber pairs were extracted from the dispersion curves produced using the portion of the wavefield within the corroded area. These were inserted into the Rayleigh–Lamb equation, from which depths were calculated and averaged.

DEFECT DETECTION AND QUALITY ASSESSMENT OF HARDWOOD LOGS:PART 2—COMBINED ACOUSTIC AND LASER SCANNING SYSTEM

2018 ◽  
Vol 50 (3) ◽  
pp. 310-322 ◽  
Author(s):  
Xiping Wang ◽  
Ed Thomas ◽  
Feng Xu ◽  
Yunfei Liu ◽  
Brian K Brashaw ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Defect Detection ◽  
Laser Scanning ◽  
Scanning System ◽  
Laser Scanning System

Underwater laser scanning system

1991 ◽  
Author(s):  
Roswell W. Austin ◽  
Seibert Q. Duntley ◽  
Richard L. Ensminger ◽  
Theodore J. Petzold ◽  
Raymond C. Smith
Keyword(s):  
Laser Scanning ◽  
Scanning System ◽  
Underwater Laser ◽  
Laser Scanning System

1255 poster PATIENT MONITORING DURING TREATMENT USING SENTINEL LASER SCANNING SYSTEM

2011 ◽  
Vol 99 ◽  
pp. S467
Author(s):  
C. Thornberg ◽  
M. Krantz ◽  
F. Nordström ◽  
R. Ljungqvist ◽  
S. Bäck
Keyword(s):  
Laser Scanning ◽  
Patient Monitoring ◽  
Scanning System ◽  
Laser Scanning System
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