Study on Time of Flight Measurement for Ultrasonic Tomography

2015 ◽  
Vol 742 ◽  
pp. 80-85
Author(s):  
Si Yuan Ren ◽  
Shi Liu ◽  
Can Song
Keyword(s):  
Measurement System ◽  
Signal Analysis ◽  
Low Cost ◽  
Experimental Studies ◽  
Time Of Flight ◽  
Ultrasonic Tomography ◽  
Threshold Method ◽  
Non Invasive ◽  
Flight Measurement ◽  
Data Acquisition Card

Owing to the distinct advantages, including non-invasive sensing, high safety and low cost, ultrasonic tomography (UT) method is considered as a promising visualization measurement method, in which acquiring high-precision the time of flight (TOF) is crucial for real applications. In this paper, a TOF measurement system is proposed for the UT measurement. The signal analysis is applied for the threshold method to confirm the TOF measurement. The Data acquisition card and the software of Libview are used for the signals acquirement. Experimental studies are implemented to validate the feasibilities of the proposed TOF measurement system, and the experimental results confirm that the TOF measurement system is successful for the TOF measurement.

Construction of a time-of-flight measurement system to study the low energy positronium production

1999 ◽  
Vol 149 (1-4) ◽  
pp. 269-275 ◽  
Author(s):  
N.N Mondal ◽  
R Hamatsu ◽  
T Hirose ◽  
H Iijima ◽  
M Irako ◽  
...  
Keyword(s):  
Measurement System ◽  
Time Of Flight ◽  
Low Energy ◽  
Flight Measurement

Concordia Transform-Based Current Analysis for Induction Motor Diagnosis

2013 ◽  
Vol 569-570 ◽  
pp. 481-488
Author(s):  
Jin Jiang Wang ◽  
Robert X. Gao ◽  
Ru Qiang Yan
Keyword(s):  
Induction Motor ◽  
Instantaneous Frequency ◽  
Low Cost ◽  
Experimental Studies ◽  
Current Analysis ◽  
New Approach ◽  
Non Invasive ◽  
Bearing Defects ◽  
Bearing Defect ◽  
Three Phase

This paper presents a new approach for bearing defect diagnosis in induction motor by taking advantage of three-phase stator current analysis based on Concordia transform. The current signature caused by bearing defect is firstly analyzed using an analytic model. Concordia transform is performed to extract the instantaneous frequency based on phase demodulation. The bearing defect feature is then identified via spectrum analysis of the variation of current instantaneous frequency. Both simulation and experimental studies are performed to demonstrate the effectiveness of proposed method in identifying bearing defects. The method is inherently low cost, non-invasive, and computational efficient, making it a good candidate for various applications.

A time-of-flight measurement system for the HADES wide-aperture dielectron spectrometer

2000 ◽  
Vol 43 (4) ◽  
pp. 435-452
Author(s):  
N. V. Rabin ◽  
D. A. Vasil'ev ◽  
S. V. Vladimirov ◽  
A. G. Nekhaev ◽  
V. T. Smolyankin ◽  
...  
Keyword(s):  
Measurement System ◽  
Time Of Flight ◽  
Wide Aperture ◽  
Flight Measurement
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