scholarly journals Application of Phase-Reversal Fresnel Zone Plates for Improving The Elevation Resolution in Ultrasonic Testing with Phased Arrays

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5080
Author(s):  
Dmitry O. Dolmatov ◽  
Daniel Tarrazó-Serrano ◽  
German A. Filippov ◽  
Igor V. Minin ◽  
Oleg V. Minin ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Ultrasonic Testing ◽  
Phased Arrays ◽  
Fresnel Zone ◽  
Ultrasonic Nondestructive Testing ◽  
Fresnel Zone Plates ◽  
Phase Reversal ◽  
Zone Plates

Currently, phased arrays have found wide application in ultrasonic nondestructive testing. Volumetric results provided by the

scholarly journals Application of Phase-Reversal Fresnel Zone Plates for High-Resolution Robotic Ultrasonic Non-Destructive Evaluation

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7792
Author(s):  
Dmitry O. Dolmatov ◽  
Daniel Tarrazó-Serrano ◽  
German A. Filippov ◽  
Antonio Uris ◽  
Dmitry A. Sednev
Keyword(s):  
High Resolution ◽  
Fresnel Zone ◽  
Signal To Noise Ratio ◽  
Size Estimation ◽  
Signal To Noise ◽  
Fresnel Zone Plates ◽  
Phase Reversal ◽  
Zone Plates ◽  
Noise Ratio ◽  
Non Destructive

Nowadays the development of automated inspection systems based on six degrees of freedom robotic manipulators is a highly relevant topic in ultrasonic non-destructive testing. One of the issues associated with such development is the problem of acquiring high-resolution results. In this article, the application Phase-Reversal Fresnel Zone Plates is considered for solving this problem. Such acoustic lenses can solve the task of high-resolution results acquisition by using a single unfocused transducer. Furthermore, Phase-Reversal Fresnel Zone Plates can provide the desired focusing depth with the fixed thickness of the coupling layer. It is important in the case of application of devices which provide localized coupling. In this paper a proper design of Phase-Reversal Fresnel Zone Plate was determined according to the conditions of planned experiments. Its efficiency was verified via the Finite Element Method modeling. In all performed experiments the relative error of flaws size estimation did not exceed 6% whereas the signal-to-noise ratio was not lower than 17.1 dB. Thus, experimental results demonstrate that the application of Phase-Reversal Fresnel Zone Plates allowed to obtain results with high lateral resolution and signal-to-noise ratio. These results demonstrate the reasonability of the development of devices that provide localized coupling and use Phase-Reversal Fresnel Zone Plates.

scholarly journals Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5066
Author(s):  
José Miguel Fuster ◽  
Sergio Pérez-López ◽  
Francisco Belmar ◽  
Pilar Candelas
Keyword(s):  
Intensity Distribution ◽  
Fresnel Zone ◽  
Focal Depth ◽  
Acoustic Intensity ◽  
Fresnel Zone Plates ◽  
Therapeutic Applications ◽  
Zone Plates ◽  
Ultrasound Applications

In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or decreasing the width of some of the FZP Fresnel rings by a certain amount. We investigate how the magnitude of the predistortion, as well as the number and location of the predistorted rings, influences the lens focusing profile. This focusing profile can be affected in different ways depending on the area of the lens where the predistortion is applied. It is shown that when the inner area of the lens, closer to its center, is predistorted, this technique allows the control of the focal depth at the main focus. However, when the predistortion is applied to an area farther from the center of the lens, the acoustic intensity distribution among the main focus and the closest adjacent secondary foci can be tailored at a certain degree. This predistortion technique shows great potential and can be used to control, modify and shape the FZP focusing profile in both industrial and therapeutic applications.

APD-based x-ray imaging telescope using Fresnel zone plates for extremely high spatial resolution

2005 ◽  
Author(s):  
Michael R. Squillante ◽  
Richard A. Myers ◽  
Mitchell Woodring ◽  
James F. Christian ◽  
Frank Robertson ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
X Ray ◽  
Zone Plates ◽  
X Ray Imaging ◽  
Imaging Telescope

Fresnel zone plates for two wavelengths

1995 ◽  
Author(s):  
Eugene O. Curatu ◽  
Roxana N. Radvan ◽  
Roxana Savastru
Keyword(s):  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
Zone Plates

Diffraction phenomena inside thick Fresnel zone plates

Radio Science ◽  
1996 ◽  
Vol 31 (6) ◽  
pp. 1815-1822 ◽  
Author(s):  
Yuri V. Kopylov ◽  
Alexei V. Popov ◽  
Alexander V. Vinogradov
Keyword(s):  
Fresnel Zone ◽  
Fresnel Zone Plates ◽  
Zone Plates

Investigation on the Preparation of High Precision Multilayer X-ray Fresnel Zone Plates Based on Atomic Layer Deposition Technology

2021 ◽  
Vol 50 (1) ◽  
pp. 156-164
Author(s):  
吴鹿杰 Lujie WU ◽  
文庆涛 Qingtao WEN ◽  
高雅增 Yazeng GAO ◽  
卢维尔 Weier LU ◽  
夏洋 Yang XIA ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
High Precision ◽  
Fresnel Zone ◽  
Atomic Layer ◽  
Fresnel Zone Plates ◽  
X Ray ◽  
Zone Plates ◽  
Layer Deposition ◽  
Deposition Technology
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