Surface Roughness Characterization through the Use of Diffuse Component of Scattered Air-Coupled Ultrasound

Sukmana, Deden Dian; Ihara, Ikuo

doi:10.1143/jjap.45.4534

Cited by 24 publications

(18 citation statements)

References 35 publications

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“…Sukamana and Ihara [2] measured the reflection from surfaces of different roughness using air-coupled single element transducers. They find that the dependence on angle decreases when the roughness increases, as was also found in the present study.…”

Section: Discussionmentioning

confidence: 99%

Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Sjøj

Blanco

Wilhjelm³

et al. 2012

AIP Conference Proceedings

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Optimal filter bandwidth for pulse oximetry Rev. Sci. Instrum. 83, 104708 (2012) Optical transduction of E. Coli O157:H7 concentration by using the enhanced Goos-Hänchen shift J. Appl. Phys. 112, 083104 (2012) Detection of virus-like nanoparticles via scattering using a chip-scale optical biosensor Appl. Phys. Lett. 101, 161111 (2012) Role of electropores on membrane blebbing-A model energy-based analysis J. Appl. Phys. 112, 064703 (2012) Additional information on AIP Conf. Proc. Abstract. The echo from planar surfaces with rms roughness, R q , in the range from 0-155 µm was measured with a clinical linear array transducer at different angles of incidence at 6 MHz and 12 MHz. The echo-pulse from the surfaces was isolated with an equal sized window and the power of the echo-pulse was calculated. The power of the echo from the smooth surface (R q = 0) is highly angle-dependent due to a high degree of specular reflection. Within the angular range considered here, -10 • to 10 • , the variation spans a range of 18 dB at both 6 MHz and 12 MHz. When roughness increases, the angle-dependence decreases, as the echo process gradually changes from pure reflection to being predominantly governed by backscattering. The power of the echoes from the two roughest surfaces (R q = 115 µm and 155 µm) are largely independent of angle at both 6 MHz and 12 MHz with a variation of 2 dB in the angular range from -10 • to 10 • . The least rough surfaces (R q = 32 µm and 89 µm) have responses in between with a higher degree of angle-dependence at 6 MHz than at 12 MHz.

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Section: Discussionmentioning

confidence: 99%

Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Sjøj

Blanco

Wilhjelm³

et al. 2012

AIP Conference Proceedings

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“…The air-coupled acoustic transducer uses air as the medium to detect the defect in aerospace composites, foods, drugs, etc. [ 1 , 2 ], in which the coupling agent is prohibited or caution used. An air-coupled acoustic transducer commonly uses the piezoelectric composite as the acoustic wave source.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Modeling of Matching System for Air-Coupled Transducer

2022

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The tremendous acoustic impedance difference between the piezoelectric composite and air prevents the ultrasonic transition, resulting in low amplitude for the received signal for the composite defect detection using an air-coupled transducer. The matching system, which includes the matching layers and bonding layers attached to the piezoelectric composite, can reduce the acoustic impedance difference and benefit the acoustic transition. In this paper, the fabrication method and modeling for the matching layers are proposed to optimize the transducer performance. The effects of bonding layer material on the transducer performance are also discussed. Experiments were conducted for modeling validation. The proposed model can predict the matching layer acoustic properties with an error of less than 11%. The bonding layer using the same material as the first matching layer can help to increase the sensitivity by about 33% compared to the traditional epoxy bonding. The optimized air-coupled ultrasonic transducer, based on the results of this study, has a 1283 mV amplitude in the air, which is 56% higher than commercially available transducers, and can identify the defects in two typical non-metallic composite materials easily.

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“…Acoustic sensing in air has potential applications for obtaining various types of information about the surrounding object such as its position, shape, material and movement [1][2][3][4][5][6][7][8][9][10]. We reported results of the position detection of small objects with a size comparable to the signal wavelength, using an M-sequence-modulated signal [11,12].…”

Section: Introductionmentioning

confidence: 99%

Measurement of ultrasonic transmission attenuation characteristics of canvas fabric

Hoshiba

Hirata

Hachiya

2015

Acoust. Sci. & Tech.

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Surface Roughness Characterization through the Use of Diffuse Component of Scattered Air-Coupled Ultrasound

Cited by 24 publications

References 35 publications

Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Fabrication and Modeling of Matching System for Air-Coupled Transducer

Measurement of ultrasonic transmission attenuation characteristics of canvas fabric

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