Comparison between beamforming and super resolution imaging algorithms for non-destructive evaluation

2014 ◽  
Author(s):  
Chengguang Fan ◽  
Bruce W. Drinkwater
Keyword(s):  
Super Resolution ◽  
Non Destructive Evaluation ◽  
Resolution Imaging ◽  
Imaging Algorithms ◽  
Non Destructive

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.

Studies on Novel Hyperlens Concept for Ultrasonic Non Destructive Evaluation

2021 ◽  
Author(s):  
Pradeep Kumar ◽  
Mohamed Subair Syed Akbar Ali ◽  
Prabhu Rajagopal
Keyword(s):  
Near Field ◽  
Ultrasonic Imaging ◽  
Super Resolution ◽  
Cost Effective ◽  
Medical Diagnostics ◽  
Evanescent Waves ◽  
Far Field ◽  
Resolution Limit ◽  
Non Destructive Evaluation ◽  
Non Destructive

Abstract Ultrasonic imaging is widely preferred in the field of non-destructive evaluation, medical diagnostics, and underwater inspection because it offers various advantages such as safety and versatility. However, conventional ultrasonic imaging methods suffer from the poor resolution limit imposed by the loss of information on fine features within the near-field. Metamaterial concepts have attracted much research interest in recent years, yielding extraordinary benefits such as super-resolution imaging, vibration damping, and cloaking. In the context of imaging, Metalenses allow the successful transfer of the information carried by the evanescent waves to far-field by amplifying them and hence help in overcoming the resolution limit. Hyperlenses enable subwavelength resolution along with spatial magnification by transforming evanescent waves scattered past a material artifact into propagating waves at the far-field ‘imaging’ end of the medium. This paper discusses novel radially symmetric ultrasonic hyperlens for imaging defects in the context of non-destructive evaluation, a topic that has not been studied much. The effect of parameters such as defect extent and distance between the lens on the subwavelength imaging of the hyperlens is studied using numerical simulations. This study investigates the magnification achievable using the proposed hyperlens and the effectiveness of this approach for nondestructive evaluation using cost-effective ‘everyday’ transducers.

Axial super-resolution in ultrasound imaging with application to non-destructive evaluation

Ultrasonics ◽  
2020 ◽  
Vol 108 ◽  
pp. 106183
Author(s):  
Saurav K. Shastri ◽  
Sunil Rudresh ◽  
Ramkumar Anand ◽  
Sudarshan Nagesh ◽  
Chandra Sekhar Seelamantula ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
Super Resolution ◽  
Non Destructive Evaluation ◽  
Non Destructive
Sign in / Sign up

Export Citation Format

Share Document