Development of Circuits for Excitation and Reception in Ultrasonic Transducers for Generation of Guided Waves in Hollow Cylinders for Fouling Detection

Silva, J. Jo da; Wanzeller, M.G.; Farias, P. de Almeida; Neto, José Sérgio da Rocha

doi:10.1109/tim.2007.915480

Cited by 30 publications

(9 citation statements)

References 8 publications

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“…Crystals being focused in the center of a channel maintain their liquid mobility by preventing fouling to the surfaces. Fouling is a common showstopper in the pharmaceutical industry [30] as well as in XFEL injectors [31]. Typically, only a few minutes of data collection can be done before the injector must be removed and cleaned.…”

Section: Crystal Handling In Microfluidic Channelmentioning

confidence: 99%

Focusing of Microcrystals and Liquid Condensates in Acoustofluidics

et al. 2019

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Manipulation of high-density materials, such as crystals and liquid condensates, is of great importance for many applications, including serial crystallography, structural and molecular biology, chemistry, and medicine. In this work, we describe an acoustic technique to focus and harvest flowing crystals and liquid condensates. Moreover, we show, based on numerical simulations, that the acoustic waves can be used for size-based particle (crystals, droplets, etc.) separation. This is an essential technological step in biological research, medical applications, and industrial processes. The presented technology offers high precision, biocompatibility, ease of use and additionally, is non-invasive and inexpensive. With the recent advent of X-ray Free Electron Laser (XFEL) technology and the associated enormous importance of a thin jet of crystals, this technology might pave the way to a novel type of XFEL injector.

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Section: Crystal Handling In Microfluidic Channelmentioning

confidence: 99%

Focusing of Microcrystals and Liquid Condensates in Acoustofluidics

et al. 2019

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“…Compared with piezoelectric ultrasonic transducers, EMAT is more versatile and more accessible to be used in the field of NDE because it does not require a couplant [6]. [7]. Through different combinations of the coil and permanent magnets, EMAT could generate waves of different modes in the specimen: shear vertical (SV) body waves, shear horizontal (SH) guided waves, longitudinal waves, Rayleigh surface waves, and Lamb waves.…”

Section: Introductionmentioning

confidence: 99%

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Sun

Peng

Wang

et al. 2021

IEEE Trans. Instrum. Meas.

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To overcome the shortcomings of low energy conversion efficiency of electromagnetic acoustic transducers (EMATs), point-focusing shear horizontal (PFSH) wave EMAT is used to focus the wave energy into a specific area. Many factors will affect the capability of the focusing transducer, and in addition to considering the signal intensity, the detection accuracy is also required to be investigated. Specifically, to simplify the test process, we use the orthogonal test method to study the effect of different influence parameters on signal intensity and focal area dimensions. Seven factors are selected, and three results are determined in the test. Range analysis shows that for signal amplitude M, the top three impact factors are the coil width w, coil turns n, and focal length lF (equal to bandwidth factor ). Moreover, magnet number m and frequency fc dominate the effective focal length lfd, and aperture angle determines the effective focal width wfd. To enable higher signal intensity and smaller focal area dimensions, it is necessary to consider various factors on the PFSH-EMAT focusing performance. The test's signal intensity with optimized parameters' combination at the focal point is nearly 144.42% higher than the average of all the tests, lfd decreased by 37.84%, and wfd decreased by 50.59%. The experiment also verified that focusing EMAT with optimized parameters has a better focusing performance.

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“…ONDESTRUCTIVE testing (NDT) technology has been widely used in industrial online monitoring as a detection method that does not damage a specimen [1] - [6]. There are five primary methods to detect defects: ultrasonic, radiographic, magnetic leakage, penetrant, and eddy current testing [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Point-Focusing Shear-Horizontal Guided Wave EMAT Optimization Method Using Orthogonal Test Theory

et al. 2020

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As a class of devices used in sound detection, electromagnetic acoustic transducers (EMATs) have been widely used in the field of nondestructive testing (NDT) owing to their advantages such as contact-free operation, wide applicability, and high performance. However, their low energy-conversion efficiency is the main drawback that limits usage in industrial testing. In this work, we report the effect of different parameters of the point-focusing shear-horizontal EMAT (PFSH_EMAT) on the signal intensity of the receiving transducer. The impact factors of the focusing transducer are as follows: number of magnets in a row m, fan-shaped periodic permanent magnet (FPPM) remanence magnetization Br, coil width w, coil winding number n, aperture angle , focal length IF, life-off distance h1, excitation current frequency fc and current amplitude Ic. To improve the analysis efficiency, and L32(4 9) orthogonal table is used to investigate the nine different factors at four levels, which can be calculated through finite element simulations. The effect of each factor on the signal intensity is obtained by range analysis, and the influence degree of each factor is obtained, and the parameter combination is optimized by analyzing the test results to improve the PFSH-EMAT's performance. The experimental results show that the optimized PFSH-EMAT is 170% more efficient than the average of the top-three signal intensities in the orthogonal test, which proves the effectiveness of the proposed optimization method.

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Development of Circuits for Excitation and Reception in Ultrasonic Transducers for Generation of Guided Waves in Hollow Cylinders for Fouling Detection

Cited by 30 publications

References 8 publications

Focusing of Microcrystals and Liquid Condensates in Acoustofluidics

Focusing of Microcrystals and Liquid Condensates in Acoustofluidics

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Point-Focusing Shear-Horizontal Guided Wave EMAT Optimization Method Using Orthogonal Test Theory

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