Quantitative Time-of-Flight (TOF) Imaging for Nondestructive Evaluation by Computerized Ultrasonic Tomography

1982 ◽  
pp. 729-733 ◽  
Author(s):  
J. W. Eberhard
Keyword(s):  
Nondestructive Evaluation ◽  
Time Of Flight ◽  
Ultrasonic Tomography

scholarly journals Zernike ultrasonic tomography for fluid velocity imaging based on pipeline intrusive time-of-flight measurements

2014 ◽  
Vol 61 (11) ◽  
pp. 1846-1855 ◽  
Author(s):  
Nikola Besic ◽  
Gabriel Vasile ◽  
Andrei Anghel ◽  
Teodor-Ion Petrut ◽  
Cornel Ioana ◽  
...  
Keyword(s):  
Fluid Velocity ◽  
Time Of Flight ◽  
Ultrasonic Tomography ◽  
Velocity Imaging ◽  
Flight Measurements

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.

Two-dimensional ultrasonic tomography in nondestructive evaluation by using area functions

1990 ◽  
Vol 37 (3) ◽  
pp. 148-158 ◽  
Author(s):  
L.S. Koo ◽  
H.R. Shafiee ◽  
D.K. Hsu ◽  
S.J. Wormley ◽  
D.O. Thompson
Keyword(s):  
Nondestructive Evaluation ◽  
Ultrasonic Tomography ◽  
Two Dimensional

Nondestructive Evaluation of Non-Strand Defects in Stay Cable Specimens

2018 ◽  
Vol 2672 (41) ◽  
pp. 101-112 ◽  
Author(s):  
Madhu M. Karthik ◽  
Tevfik Terzioglu ◽  
Casey Jones ◽  
Stefan Hurlebaus ◽  
Mary Beth D. Hueste
Keyword(s):  
Nondestructive Evaluation ◽  
Low Frequency ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Water Infiltration ◽  
Ultrasonic Tomography ◽  
Stay Cable ◽  
Visual Testing ◽  
Cable Stayed Bridges

Stay cable systems are used extensively for the construction of long-span bridges owing to their inherent advantages. In most cable-stayed bridges the steel strands within the main tension elements (MTEs) are grouted to provide a corrosion protection system. However, there could be segregated grout, voids, and water accumulation/infiltration within these voids in the ducts due to poor quality of the grouting material and grouting techniques. These locations may act as initiators for the corrosion of steel strands within the ducts, which can have serious implications on the load carrying capacity and safety of cable-stayed bridges. In this investigation, several nondestructive evaluation (NDE) techniques are evaluated to determine their ability to detect grout defects within the anchorage regions, end caps, and MTEs of the stay cable system. Four stay cable specimen mock-ups with known grout defects and voids were fabricated. NDE methods that were part of this investigation included ground penetrating radar, infrared thermography, electrical capacitance tomography, impact echo, sounding, ultrasonic tomography, ultrasonic pulse velocity, low frequency ultrasound, visual testing, and borescope. While a few NDE methods could identify voids and water infiltration defects within the high-density polyethylene (HDPE) MTEs, it is evident that there is still a need for a method that is effective in detecting grout defects within the metal ducts embedded in the anchorage region and metal MTEs. Although visual testing and borescope methods are effective in identifying the defects, prior information about the location of the defects is generally required.

Applications of Time-OF-Flight Secondary Ion Mass Spectrometry (TOF-SIMS)

1990 ◽  
Vol 48 (2) ◽  
pp. 308-309
Author(s):  
Bruno Schueler ◽  
Robert W. Odom
Keyword(s):  
Mass Spectrometry ◽  
Secondary Ion Mass Spectrometry ◽  
Structural Information ◽  
Time Of Flight ◽  
Biological Tissues ◽  
Polymer Surfaces ◽  
Tof Sims ◽  
Secondary Ions ◽  
Ion Mass Spectrometry ◽  
Secondary Ion

Time-of-flight secondary ion mass spectrometry (TOF-SIMS) provides unique capabilities for elemental and molecular compositional analysis of a wide variety of surfaces. This relatively new technique is finding increasing applications in analyses concerned with determining the chemical composition of various polymer surfaces, identifying the composition of organic and inorganic residues on surfaces and the localization of molecular or structurally significant secondary ions signals from biological tissues. TOF-SIMS analyses are typically performed under low primary ion dose (static SIMS) conditions and hence the secondary ions formed often contain significant structural information.This paper will present an overview of current TOF-SIMS instrumentation with particular emphasis on the stigmatic imaging ion microscope developed in the authors’ laboratory. This discussion will be followed by a presentation of several useful applications of the technique for the characterization of polymer surfaces and biological tissues specimens. Particular attention in these applications will focus on how the analytical problem impacts the performance requirements of the mass spectrometer and vice-versa.

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