Security and non destructive evaluation application of high speed time domain terahertz imaging

2006 ◽  
Author(s):  
David Zimdars ◽  
Jeffrey S. White ◽  
G. Stuk ◽  
A. Chernovsky ◽  
G. Fichter ◽  
...  
Keyword(s):  
Time Domain ◽  
High Speed ◽  
Terahertz Imaging ◽  
Non Destructive Evaluation ◽  
Non Destructive

scholarly journals Non-Destructive Characterization of Railway Materials and Components with Infrared Thermography Technique

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4077 ◽  
Author(s):  
Jeongguk Kim
Keyword(s):  
Infrared Thermography ◽  
Thermal Imaging ◽  
High Speed ◽  
Hot Spot ◽  
Imaging Techniques ◽  
Brake Disc ◽  
Ir Thermography ◽  
Contact Mode ◽  
Non Destructive Evaluation ◽  
Non Destructive

Infrared (IR) thermography technology is one of the leading non-destructive evaluation (NDE) techniques based on infrared detection. Infrared thermography, in particular, has the advantage of not only being used in non-contact mode but also provides full images, real-time inspection, and relatively fast results. These advantages make it possible to perform thermal imaging analysis of railway materials and/or components, such as brake disc simulation, monitoring of abnormal heat generation, and monitoring of temperature changes, during mechanical tests. This study introduces the current state of research on railway materials and/or components using IR thermography technology. An attempt was made to characterize the deterioration of electrical equipment of diesel electric locomotives using infrared thermal imaging techniques. In addition, surface temperature monitoring was performed during tensile testing of railway steels using a high-speed infrared camera. Damage evolution due to the hot spot generation of railway brake discs was successfully monitored using high-speed IR cameras. In this paper, IR thermal imaging technology, used as a non-destructive evaluation analysis in the railway field, was introduced, and the results of recent research are presented.

2D and 3D non-destructive evaluation of a wooden panel painting using shearography and terahertz imaging

2009 ◽  
Vol 42 (6) ◽  
pp. 543-549 ◽  
Author(s):  
R.M. Groves ◽  
B. Pradarutti ◽  
E. Kouloumpi ◽  
W. Osten ◽  
G. Notni
Keyword(s):  
Terahertz Imaging ◽  
Non Destructive Evaluation ◽  
Panel Painting ◽  
2D And 3D ◽  
Non Destructive ◽  
Wooden Panel

scholarly journals Comparison of Time Domain and Frequency-Wavenumber Domain Ultrasonic Array Imaging Algorithms for Non-Destructive Evaluation

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4951 ◽  
Author(s):  
Zeyu Zhuang ◽  
Jie Zhang ◽  
Guoxuan Lian ◽  
Bruce W. Drinkwater
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Low Noise ◽  
Wavenumber Domain ◽  
Imaging Parameters ◽  
Non Destructive Evaluation ◽  
Ultrasonic Array ◽  
Imaging Algorithms ◽  
Array Imaging ◽  
Non Destructive

Ultrasonic array imaging algorithms have been widely developed and used for non-destructive evaluation (NDE) in the last two decades. In this paper two widely used time domain algorithms are compared with two emerging frequency domain algorithms in terms of imaging performance and computational speed. The time domain algorithms explored here are the total focusing method (TFM) and plane wave imaging (PWI) and the frequency domain algorithms are the wavenumber algorithm and Lu’s frequency-wavenumber domain implementation of PWI. In order to make a fair comparison, each algorithm was first investigated to choose imaging parameters leading to overall good imaging resolution and signal-to-noise-ratio. To reflect the diversity of samples encountered in NDE, the comparison is made using both a low noise material (aluminium) and a high noise material (copper). It is shown that whilst wavenumber and frequency domain PWI imaging algorithms can lead to fast imaging, they require careful selection of imaging parameters.

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