A novel technique for dynamic alignment of ultrasonic transducers in real-time non-destructive testing

2004 ◽  
Author(s):  
G.P.P. Gunarathne ◽  
Y. Qureshi
Keyword(s):  
Real Time ◽  
Ultrasonic Transducers ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Novel Technique ◽  
Non Destructive ◽  
Dynamic Alignment

Optical coherence tomography for non-destructive testing

2020 ◽  
Vol 87 (6) ◽  
pp. 404-413
Author(s):  
Fabian Zechel ◽  
Rouwen Kunze ◽  
Niels König ◽  
Robert Heinrich Schmitt
Keyword(s):  
Optical Coherence Tomography ◽  
Real Time ◽  
Optical Method ◽  
Review Paper ◽  
Optical Coherence ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Time Evaluation ◽  
Penetration Depths

AbstractIn this review paper, conventional non-destructive testing (NDT) methods are briefly introduced and compared with selected examples for applications of optical coherence tomography (OCT) for NDT. The contactless, non-destructive and purely optical method enables multi-dimensional imaging for tomographic real-time evaluation in various fields of application. Depending on the material, penetration depths of several millimeters can be achieved, thus providing an attractive solution that can be used both as a stand-alone and as a process-integrated solution.

scholarly journals A Versatile Illumination System for Real-Time Terahertz Imaging

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3993
Author(s):  
Jean-Baptiste Perraud ◽  
Adrien Chopard ◽  
Jean-Paul Guillet ◽  
Pierre Gellie ◽  
Antoine Vuillot ◽  
...  
Keyword(s):  
Real Time ◽  
Signal To Noise Ratio ◽  
Beam Steering ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Full Field ◽  
Illumination System ◽  
Optimized Distribution ◽  
Non Destructive ◽  
Field Imaging

Terahertz technologies are attracting strong interest from high-end industrial fields, and particularly for non-destructive-testing purposes. Currently lacking compactness, integrability as well as adaptability for those implementations, the development and commercialisation of more efficient sources and detectors progressively ensure the transition toward applicative implementations, especially for real-time full-field imaging. In this work, a flexible illumination system, based on fast beam steering has been developed and characterized. Its primary goal is to suppress interferences induced by the coherence length of certain terahertz sources, spoiling terahertz images. The second goal is to ensure an enhanced signal-to-noise ratio on the detector side by the full use and optimized distribution of the available power. This system provides a homogeneous and adjustable illumination through a simplified setup to guarantee optimum real-time imaging capabilities, tailored to the sample under inspection. Working toward industrial implementations, different illumination process are conveniently assessed as a result of the versatility of this method.

scholarly journals Insights into Acoustically Induced PiezoLuminescence: The Visualization of Ultrasonic Beam Patterns

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 491
Author(s):  
Simon Michels ◽  
Mathias Kersemans ◽  
Guillaume Lajoinie ◽  
Michel Versluis ◽  
Philippe F. Smet
Keyword(s):  
Ultrasonic Transducers ◽  
Non Destructive Testing ◽  
Ultrasonic Beam ◽  
Destructive Testing ◽  
Full Field ◽  
Ultrasound Field ◽  
Non Destructive ◽  
Beam Patterns ◽  
Ultrasonic Investigation

Ultrasonic transducers are used in many fields of application, including medical imaging/treatment, non-destructive testing and material characterization. To assure the quality of the ultrasonic investigation transducers require regular checks for possible deterioration and accurate calibration. Current methods rely on point-by-point scanning of the ultrasound field with a needle hydrophone, which is expensive and time consuming. Recently, we have developed a new concept, in which a fast full-field visualization of the radiation field is achieved through Acoustically induced PiezoLuminescence (APL). Here, we report on an improved ultrasonic beam visualization and provide further insights into the mechanism underlying APL and mechanoluminescence.

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