Subharmonic Phased Array for Crack Evaluation (SPACE)

Ohara, Yoshikazu; Mihara, Tsuyoshi; Yamanaka, Kazushi

doi:10.1007/978-3-319-94476-0_10

Cited by 2 publications

(1 citation statement)

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“…[22][23][24]. Based on that, some studies demonstrated accurate monitoring of fatigue crack growth in metallic samples using nonlinear phased array methods relying on the measurement of the second harmonic [25], the sub-harmonics [26][27][28][29] and the diffuse field energy [30,31]. However, higher harmonic and sub-harmonic generation can be partially or totally related to system/instrumentation nonlinearities, and the acquisition of the diffused field of all array elements is time consuming and requires advanced signal processing [31,32].…”

Section: Introductionmentioning

confidence: 99%

A nonlinear ultrasonic modulation approach for the detection and localisation of contact defects

Andreades

Fierro

Meo

2022

Mechanical Systems and Signal Processing

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Section: Introductionmentioning

confidence: 99%

A nonlinear ultrasonic modulation approach for the detection and localisation of contact defects

Andreades

Fierro

Meo

2022

Mechanical Systems and Signal Processing

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Toward an ultra-high resolution phased-array system for 3D ultrasonic imaging of solids

Ohara

Remillieux

Onuma

et al. 2020

Applied Physics Letters

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Ultrasonic phased-array (PA) systems have been widely adopted in the field of nondestructive evaluation for material characterization and imaging of internal defects. Whereas many defects exhibit complex three-dimensional structures, most PA systems provide only two-dimensional images. In this Letter, we demonstrate the ability to create high-resolution 3D images of internal defects using a PA system based on a piezoelectric and laser ultrasonic system (PLUS). The PLUS combines a piezoelectric transmitter to insonify the structure to be inspected with a laser Doppler vibrometer to create a matrix array of receiver points without contact. The small size of the laser beam results in an ultra-multiple number of elements on the order of thousands, which is impossible to achieve with a conventional piezoelectric matrix array transducer. An emission from a piezoelectric transmitter compensates for the intrinsically low sensitivity of a laser Doppler vibrometer. After formulating the 3D imaging algorithm of the PLUS, we demonstrate that the PLUS with 4096 receiving points (i.e., 64 × 64 points) achieves high-resolution 3D imaging in a specimen with a flat bottom hole. We also visualize the complex structure of stress corrosion cracking. We believe that the 3D imaging capability of the PLUS may open up new avenues to the accurate evaluation of material strength, the identification of the types of defects, and the elucidation of the mechanisms of defect initiation.

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Subharmonic Phased Array for Crack Evaluation (SPACE)

Cited by 2 publications

References 43 publications

A nonlinear ultrasonic modulation approach for the detection and localisation of contact defects

A nonlinear ultrasonic modulation approach for the detection and localisation of contact defects

Toward an ultra-high resolution phased-array system for 3D ultrasonic imaging of solids

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