Electrical resonance/antiresonance characterization of NDT transducer and possible optimization of impulse excitation signals width and their types

Franček, Petar; Petošić, Antonio; Budimir, Marko; Hrabar, Ivan

doi:10.1016/j.ndteint.2019.05.005

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…Electrical impedance of the probe is an indication of electromechanical coupling efficiency [ 20 ]. It is a simple technique, allowing for quick estimation of resonant frequencies and electrical matching efficiency [ 22 ]. Probe’s directivity is the most important property [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Svilainis

Chaziachmetovas

Kybartas

et al. 2020

Sensors

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Air-coupled ultrasonic probes require a special design approach and handling due to the significant mismatch to the air. Outer matching layers have to be soft so can be easily damaged and excitation voltages might cause the degradation of electrodes or bonding between the layers. Integrity inspection is desired during design, manufacturing, and exploitation. Spatial distribution of a transduction efficiency over piezoelement surface is proposed as a convenient means for the air-coupled probe integrity inspection. Focused transducer of similar center frequency is used to scan the surface of the inspected probe. However, such approach creates a challenge, i.e., area of the scanning beam is much smaller than the total receiving area of the inspected probe, therefore, contrast and imaging resolution are significantly degraded. Masking aperture made from cardboard and felt, placed at the focal point was proposed as solution. Far-range sidelobes were suppressed down to the noise floor (−50 dB) and the near-range sidelobes were reduced down to −17 dB. The proposed modification allows to use a similar frequency focused transducer. Probe integrity inspection can be carried out at significantly enhanced contrast and lateral resolution. Natural and artificial defects can be detected by the use of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Svilainis

Chaziachmetovas

Kybartas

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

Designing of a Laboratory Complex for Spectral Analysis of Measurement Data of Different Materials

Khamitov

Kolchurina²,

Kolchurina³

et al. 2021

Progress in Material Science and Engineering

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Laboratory complex for studying the quality of materials using spectral analysis of signals

Khamitov

Kolchurina

et al. 2021

J. Phys.: Conf. Ser.

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The article describes the process of development and testing of a laboratory complex for spectral analysis of measured data, which is based on a signal processing method based on measuring the frequency and amplitude of the signal (spectral method) with further evaluation using fast Fourier transform. The described laboratory complex consists of a spectrum analyzer connected to a personal computer with special software installed on it, a loudspeaker and a laser sensor. The paper substantiates the relevance of the development, due to the fairly wide use of spectral analysis methods in science, technology and production, the advantages of using a laboratory complex in comparison with analogues were shown. There is a description of the experiments to measure the speed of objects, control their location, vibration measurement. The procedure of verification and calibration is performed with the use of this complex, as well as the use of the system of automatic regulation and stabilization of production processes and the training of laboratory works for students of different directions of training in technical and economic specialties.

show abstract

Electrical resonance/antiresonance characterization of NDT transducer and possible optimization of impulse excitation signals width and their types

Cited by 5 publications

References 12 publications

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Designing of a Laboratory Complex for Spectral Analysis of Measurement Data of Different Materials

Laboratory complex for studying the quality of materials using spectral analysis of signals

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