High precision, accuracy, and resolution of 3D laser scanner employing pulsed time-of-flight measurement

2011 ◽  
Author(s):  
Martin Pfennigbauer ◽  
Andreas Ullrich ◽  
João Pereira do Carmo
Keyword(s):  
High Precision ◽  
Laser Scanner ◽  
Time Of Flight ◽  
Flight Measurement

scholarly journals Machine Learning Based Preprocessing to Ensure Validity of Cross-Correlated Ultrasound Signals for Time-of-Flight Measurements

2021 ◽  
Vol 40 (1) ◽  
Author(s):  
Simon Herter ◽  
Sargon Youssef ◽  
Michael M. Becker ◽  
Sarah C. L. Fischer
Keyword(s):  
Machine Learning ◽  
High Precision ◽  
Cross Correlation ◽  
Complex Structure ◽  
Time Of Flight ◽  
Industrial Applications ◽  
Ultrasonic Signals ◽  
Ultrasonic Time ◽  
Flight Measurement ◽  
Flight Measurements

AbstractHigh precision ultrasonic time-of-flight measurement is a well known part of non-destructive evaluation used in many scientific and industrial applications, for example stress evaluation or defect detection. Although ultrasonic time-of-flight measurements are widely used there are some limitations where high noise and distorted ultrasonic signals are conflicting with the demand for high precision measurements. Cross-correlation based time-of-flight measurement is one strategy to increase reliability but also exhibits some ambiguous correlation states yielding to wrong time-of-flight results. To improve the reliability of these measurements a new machine learning based approach is presented based on experimental data collected on tightened bolts. Due to the complex structure of the bolts the ultrasonic signal is influenced by boundary conditions of the geometry which lead to high number of the ambiguous cross-correlation results in practice. In this particular application, bolts are in practice evaluated discontinuously and without knowledge of the time-of-flight in the unloaded condition which prevents the use of all other available comparative preprocessing techniques to detect time-of-flight shifts. Three different preprocessing strategies were investigated based on variations in the bolting configurations to ensure a machine learning based model capable of predicting the state of the cross-correlation function for different bolting parameters. With this approach, we achieve up to 100% classification accuracy for both longitudinal and transversal ultrasonic signals under laboratory conditions. In the future the method should be extended to become more robust and be applicable in real-time for industrial applications.

Time-of-flight measurement with femtosecond pulses for high precision ranging lidar

2010 ◽  
Author(s):  
J. Lee ◽  
Y.-J. Kim ◽  
K. Lee ◽  
S. Lee ◽  
S.-W. Kim
Keyword(s):  
High Precision ◽  
Time Of Flight ◽  
Femtosecond Pulses ◽  
Flight Measurement

High precision laser ranging by time-of-flight measurement of femtosecond pulses

2012 ◽  
Vol 23 (6) ◽  
pp. 065203 ◽  
Author(s):  
Joohyung Lee ◽  
Keunwoo Lee ◽  
Sanghyun Lee ◽  
Seung-Woo Kim ◽  
Young-Jin Kim
Keyword(s):  
High Precision ◽  
Time Of Flight ◽  
Laser Ranging ◽  
Femtosecond Pulses ◽  
Flight Measurement

scholarly journals A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)

2018 ◽  
Vol 89 (10) ◽  
pp. 10I120 ◽  
Author(s):  
A. S. Moore ◽  
D. J. Schlossberg ◽  
E. P. Hartouni ◽  
D. Sayre ◽  
M. J. Eckart ◽  
...  
Keyword(s):  
High Precision ◽  
Time Of Flight ◽  
Fused Silica ◽  
Neutron Spectra ◽  
Flight Measurement ◽  
Precision Time

From long range to high precision: pushing the limits of pulsed-time-of-flight measurement

2010 ◽  
Author(s):  
Martin Pfennigbauer ◽  
Bettina Möbius ◽  
Andreas Ullrich ◽  
João Pereira do Carmo
Keyword(s):  
Long Range ◽  
High Precision ◽  
Time Of Flight ◽  
Flight Measurement

High precision time-of-flight measurements of neutron resonance energies in carbon and oxygen between 3 and 30 MeV

1980 ◽  
Vol 169 (1) ◽  
pp. 185-198 ◽  
Author(s):  
S. Cierjacks ◽  
F. Hinterberger ◽  
G. Schmalz ◽  
D. Erbe ◽  
P.v. Rossen ◽  
...  
Keyword(s):  
High Precision ◽  
Time Of Flight ◽  
Neutron Resonance ◽  
Resonance Energies ◽  
Precision Time ◽  
Flight Measurements

Time-of-flight measurement of the evaporation residues from fusion of 5.9 mev/u 84kr and 27al

1981 ◽  
Vol 371 (3) ◽  
pp. 493-509 ◽  
Author(s):  
W.F.W. Schneider ◽  
F. Pühlhofer ◽  
R.P. Chestnut ◽  
C. Volant ◽  
H. Freiesleben ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Flight Measurement ◽  
Evaporation Residues

Carrier Time-of-Flight Measurement Using a Probe Structure for Direct Evaluation of Carrier Transport in Multiple Quantum Well Solar Cells

2014 ◽  
Vol 4 (6) ◽  
pp. 1518-1525 ◽  
Author(s):  
Kasidit Toprasertpong ◽  
Naofumi Kasamatsu ◽  
Hiromasa Fujii ◽  
Tomoyuki Kada ◽  
Shigeo Asahi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Carrier Transport ◽  
Multiple Quantum Well ◽  
Time Of Flight ◽  
Multiple Quantum ◽  
Direct Evaluation ◽  
Flight Measurement
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