Lamb wave pulse compression in airborne ultrasound excitation

Shimizu, Kyosuke; Osumi, Ayumu; Ito, Youichi

doi:10.1250/ast.44.141

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…By repeating this measurement while scanning the sound source over the entire measurement area, we obtain surface wave propagation images with pulse compression applied (with a short duration). 47)…”

Section: Application Of Pulse Compression Using Chirp Signal To Rayle...mentioning

confidence: 99%

Pulse compression of guided wave by airborne ultrasound excitation for improving defect detection accuracy in concrete

Shimizu

Osumi

Ito

2023

Jpn. J. Appl. Phys.

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Scanning airborne ultrasound source technique has been developed as a safe and simple non-contact non-destructive inspection method. This method enables non-contact excitation of guided waves by using high-intensity airborne ultrasonic waves. However, the airborne ultrasound source that can generate high intensity airborne ultrasounds use resonance drive, so the sound waves are emitted for a long time. As a result, the inspection results become complicated, and the inspection accuracy decreases. To solve this problem, we proposed a pulse compression using chirp signals of guided waves generated by airborne ultrasound. In this paper, we investigated the pulse compression of guided waves generated in mortar samples using an airborne ultrasound source driven by a chirp signal. As a result, it was confirmed that the visualization accuracy of defects was improved by pulse compression.

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Section: Application Of Pulse Compression Using Chirp Signal To Rayle...mentioning

confidence: 99%

Pulse compression of guided wave by airborne ultrasound excitation for improving defect detection accuracy in concrete

Shimizu

Osumi

Ito

2023

Jpn. J. Appl. Phys.

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“…However, this technique uses a focused airborne ultrasound source that is scanned mechanically, and thus there is an upper limit to the scanning speed, resulting in long measurement times. To decrease the measurement time, the use of an airborne ultrasound phased array (AUPA) [14,15], which performs electronically controlled wave source scanning, has been investigated [16][17][18][19][20][21][22][23]. An AUPA is a sound source in which multiple ultrasound emitters are arranged in a lattice.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive testing of metal plates by guided wave propagation image using scanning sound source technique and airborne ultrasound phased array with suppressed grating lobe generation

Shimizu,

Osumi,

Ito

2023

Acoust. Sci. & Tech.

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We have been investigating non-destructive testing using a scanning airborne ultrasound source and a nonlinear harmonic method, and we have examined using an airborne ultrasound phased array (AUPA) to achieve high-speed non-destructive testing by electronically controlled scanning of the sound source. However, AUPAs can generate unnecessary foci, such as grating lobes (GLs), in addition to the main lobe (ML) generated at the focal point. In non-destructive testing, artifacts occur in the results because the ML and GLs excite the measurement object simultaneously. The GL generation can be suppressed by adjusting the spacing of the AUPA ultrasound emitters, which can decrease the generation of artifacts. In this paper, suppression of GL generation by using an AUPA and the reduction of artifacts in non-destructive testing results were verified by an experiment examining. We imaged a pseudo-defect on a metal plate by visualizing guided wave propagation without using an acoustic window.

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“…Hoshi et al 20) have conducted research using acoustic radiation pressure for the study of virtual reality in the sense of touch and developed an ultrasonic phased array. Osumi et al [21][22][23] have also attempted to generate high-intensity airborne ultrasound for nondestructive testing by arranging 100 ultrasonic transducers in a grid pattern. Yamamoto and Okubo, 24) and Kondo and Okubo 25) have studied an acoustic picker with 80 ultrasonic transducers arranged on a hemispherical inner surface to pick up small objects.…”

Section: Introductionmentioning

confidence: 99%

Noncontact manipulation of particles in air by switching pulse drive of ultrasonic speakers arrayed on a semicylinder

Kozuka

Tani

Yasui

et al. 2021

Jpn. J. Appl. Phys.

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Noncontact micromanipulation techniques are necessary for micromachine technology, biotechnology, materials processing, and so on. By using a bolted Langevin transducer and a reflector, one can trap small objects in air at nodes of sound pressure in a standing wave field, but such a technique requires high-voltage drive and careful tuning to achieve resonance. In this study, a large number of small ultrasonic speakers were placed on the inner surface of a semicylinder to form a strong sound field in the focus line. We showed that the pressure node can be moved, and thus the small object, along the focus line simply by switching the driving ultrasonic speakers without using complex electronics. We also showed that the object can be trapped and manipulated even at a duty ratio of 50% in tone burst waves. The above results are discussed by showing the experimental and calculated sound pressure distributions.

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Lamb wave pulse compression in airborne ultrasound excitation

Cited by 3 publications

References 12 publications

Pulse compression of guided wave by airborne ultrasound excitation for improving defect detection accuracy in concrete

Pulse compression of guided wave by airborne ultrasound excitation for improving defect detection accuracy in concrete

Non-destructive testing of metal plates by guided wave propagation image using scanning sound source technique and airborne ultrasound phased array with suppressed grating lobe generation

Noncontact manipulation of particles in air by switching pulse drive of ultrasonic speakers arrayed on a semicylinder

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