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Electronics
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Non-destructive Testing by Ultrasounds
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Non-destructive Testing by Ultrasounds

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Circuit and Signal Processing".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 4761

Special Issue Editors

Prof. Dr. Jaime Batista dos Santos

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
Interests: non-destructive testing by ultrasound; composite inspection; biomedical ultrasound; development of NDE equipment; defect characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Mário João S. F. Santos

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
Interests: ultrasonic non-destructive characterization of materials; ultrasonic guided waves; composite inspection; biologic tissue characterization by ultrasounds
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue (SI) encourages researchers to present new scientific achievements related to non-destructive testing by ultrasounds, namely new theories and application methods. Ultrasound is an important technique in NDT being largely used in industry. Metal and composite materials used in critical applications, such as aerospace structures, require appropriate NDT to guarantee safety. Thus, contributions on the latest R&D achievements on ‘Non-Destructive Testing by Ultrasounds’, methodologies of testing, and evaluation, as well as on the development of new equipment, analyses, and approaches to non-destructive measurements are welcome.

Authors are encouraged to submit contributions in any of the following or related areas for NDT by ultrasounds:

  • Ultrasonic non-destructive testing / ultrasonic non-destructive evaluation;
  • Ultrasonic-based structural health monitoring and damage detection;
  • Material characterization;
  • NDT of composites
  • Ultrasound phased arrays;
  • Guided waves;
  • Process monitoring;
  • Ultrasound sensors, transducers, and sensor networks;
  • Instruments, devices, and systems for ultrasound research and applications;
  • Ultrasound in civil, aerospace, and geological materials.

Prof. Dr. Jaime Batista dos Santos
Prof. Dr. Mário João S. F. Santos
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ultrasonic NDT
  • ultrasonic NDE
  • ultrasonic-based SHM
  • material characterization
  • ultrasound phased arrays
  • guided waves
  • ultrasound transducers.

Published Papers (2 papers)

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Research

9 pages, 3449 KiB  
Article
Computational Simulation of Microflaw Detection in Carbon-Fiber-Reinforced Polymers
by Mário Santos, Jaime Santos and Lorena Petrella
Electronics 2022, 11(18), 2836; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics11182836 - 08 Sep 2022
Cited by 2 | Viewed by 1186
Abstract
The evaluation of microflaws in carbon-fiber-reinforced composite laminate (CFRP) via ultrasound requires the knowledge of some important factors in addition to its structural composition. Since the laminates are heterogeneous, the high-frequency requirements to acquire high-resolution signals have limitations due to the great scattering [...] Read more.
The evaluation of microflaws in carbon-fiber-reinforced composite laminate (CFRP) via ultrasound requires the knowledge of some important factors in addition to its structural composition. Since the laminates are heterogeneous, the high-frequency requirements to acquire high-resolution signals have limitations due to the great scattering that prevents good signal-to-noise ratios. Additionally, the ultrasonic probe’s spatial and lateral resolution characteristics are important parameters for determining the detectability level of microflaws. Modelling appears as a good approach to evaluating the abovementioned factors and the probability of detection of defects in the micron range because it makes it possible to reduce the time and cost associated with developments based on experimental tests. Concerning the subject of this work, simulation is the best way to evaluate the detectability level of the proposed defects since experimental samples are not available. In this work, the simulation was implemented using the Matlab k-Wave toolbox. A 2D matrix for mimicking a CFRP was constructed with 1 μm of resolution. Four different defect types in the micron range were created in the matrix. The simulated and experimental results presented good agreement. It was concluded that the highest frequency probe that could be used to detect the simulated defects without ambiguity was 25 MHz. Full article
(This article belongs to the Special Issue Non-destructive Testing by Ultrasounds)
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15 pages, 3291 KiB  
Article
Linear Ultrasound Transmitter Based on Transformer with Improved Saturation Performance
by Stefano Ricci and Dario Russo
Electronics 2021, 10(2), 107; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10020107 - 07 Jan 2021
Cited by 2 | Viewed by 2758
Abstract
Ultrasound methods are currently employed in a wide range of applications. They are integrated in complex electronics systems, like clinical echographs, but also in small and compact boards, like industrial sensors, embedded systems, and portable devices. Ultrasound waves are typically generated by energizing [...] Read more.
Ultrasound methods are currently employed in a wide range of applications. They are integrated in complex electronics systems, like clinical echographs, but also in small and compact boards, like industrial sensors, embedded systems, and portable devices. Ultrasound waves are typically generated by energizing a piezoelectric transducer through a high-voltage sequence of small sinusoidal bursts. Moreover, in several applications, the ultrasound board should work in a wide frequency range. This makes the transmitter, i.e., the electronics that drives the transducer, a key part of the circuit. The use of a small transformer simplifies the electronics and reduces the need of high-voltage power sources. Unfortunately, the transformer magnetic core, when subjected to the sequence of bursts employed in ultrasound, is particularly prone to saturation. This phenomenon limits the maximum voltage and/or the minimum frequency the transformer can be employed for. In this work, a transmitter based on a transformer is proposed. Inspired by the technique currently employed in the power network transformers, we added a prefluxing circuit, which improves the saturation performance 2-fold. The proposed transmitter was implemented in a test board and experimented with two commercial transformers at 80 Vpp. Measurements show that the proposed prefluxing circuit moves down the minimum usable frequency 2-fold: from 400 to 200 kHz for one of the two transformers, and from 2.4 to 1.2 MHz for the other. Full article
(This article belongs to the Special Issue Non-destructive Testing by Ultrasounds)
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