Nano-second Laser-induced Plasma Shock Wave in Air for Non-contact Vibration Tests

Hosoya, Naoki; Nagata, Masaki; Kajiwara, Itsuro; Umino, Ryosuke

doi:10.1007/s11340-016-0167-9

Cited by 24 publications

(14 citation statements)

References 41 publications

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“…41 The propagation velocity of the laser-induced plasma shock wave obtained by image analysis based on the Schlieren system and that calculated by theoretical analysis agreed with each other.…”

Section: Methodssupporting

confidence: 69%

“…LA has various applications, including plasma growth, 23 LA shockwave in air, 24 LA in water, 25 cavitation bubble, 26 laser propulsion, 27,28 laser micromachining, 29 laser deposition, 30 laser peening, 31 and vibration tests and acoustic tests using LA or laser-induced breakdown (LIB). [32][33][34][35][36][37][38][39][40][41] Although multiple stress waves in silica glass generated by femtosecond LA 20 have been visualized using the shadowgraph technique, using LA as an excitation force for gels has yet to be investigated.…”

Section: Introductionmentioning

confidence: 99%

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High spatial and temporal resolution measurement of mechanical properties in hydrogels by non-contact laser excitation

et al. 2016

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Gels have received increased attention as potential materials for biological materials because they can exhibit similar mechanical properties. One obstacle for using gels is that their mechanical properties are significantly altered by defects, such as an inhomogeneous crosslink density distribution. If these defects could be detected and the values and spatial distributions of mechanical properties in the gel could be determined, it would be possible to apply gels for several fields. To achieve the high spatial and temporal resolution measurement of mechanical properties in hydrogels, in our method, a conventional contact excitation device is replaced with a non-contact excitation using laser ablation for the input and magnetic resonance elastography to measure stress waves is replaced with the Schlieren method with a high-speed camera. Magnetic resonance elastography is a local measurement technique, and consequently, requires a lot of time to characterize a sample, as well as does not have sufficient spatial resolution to obtain a broad range of elasticity coefficients of gels. We use laser ablation to apply non-contact impulse excitations to gels to generate stress waves inside them. We can determine mechanical properties of gels using the stress waves’ propagation velocity.

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Section: Methodssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

High spatial and temporal resolution measurement of mechanical properties in hydrogels by non-contact laser excitation

et al. 2016

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“…This paper proposes a non-contact and non-destructive method to generate Lamb waves against a target structure using the impulse excitation force generated by laser-induced plasma (LIP) [54][55][56][57][58][59][60][61][62][63] . Generation of non-contact and non-destructive Lamb waves should contribute tremendously to the development of damage detection technologies for large structures.…”

Section: Introductionmentioning

confidence: 99%

“…We use these shock waves as the non-contact and non-destructive excitation force against a target structure. We show that the shock waves can be used to measure the frequency response functions [61] , to detect damages or to suppress vibrations in a membrane structure [58,62] and to evaluate the firmness of apples [63] .…”

Section: Introductionmentioning

confidence: 99%

“…This study demonstrates that, within a standoff distance range of 5-40 mm, Lamb waves suitable for damage detection can be produced. Previous research [54][55][56][57][58][59][60][61][62][63] has not employed LIP shock waves as the impulse excitation force to generate Lamb waves. Furthermore, the dynamic characteristics of the lamb waves generated by LIP shock waves have yet to be controlled by changing the standoff distances in the previous research [54][55][56][57][58][59][60][61][62][63] , even though it is expected that an amplitude, a frequency band and an excitation area of the impulse excitation force generated by LIP shock waves can be adjusted by changing the standoff distance.…”

Section: Introductionmentioning

confidence: 99%

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Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave

Hosoya

Yoshinaga

Kanda

et al. 2018

International Journal of Mechanical Sciences

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a b s t r a c tThis paper proposes a non-contact and non-destructive method to generate Lamb waves against a target structure using the impulse excitation force generated by laser-induced plasma (LIP). When a high power pulse laser is irradiated in air and its laser fluence exceeds 10 15 W/m 2 , a plasma is formed. While the plasma in air expands in high speed, shock waves on the spherical surface are generated and these shock waves become the impulse excitation force against a target structure, resulting in the non-contact and non-destructive approach. A 2024 aluminum alloy plate is used as the test piece in the experiment, and the dynamic characteristics of the Lamb waves generated from LIP shock waves are measured. Phase velocity and group velocity of generated Lamb waves were compared to the calculated values from Rayleigh-Lamb frequency equations and we found that maximum error was 5% and its frequency component included at least 400 kHz. Further, we investigated the relationship between the distance from the LIP shock wave-generating location to a test piece and the dynamic characteristics of the generated Lamb waves. This method can control the amplitude and the frequency components of generated Lamb waves by changing this distance.

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Assessment of Dynamic Young’s Modulus and Damping Ratio of Bamboo Fiber Reinforced Polymer Composites using Shock Wave

Yamamoto

Takasaki²,

Hosoya

2019

Advances in Mechanism and Machine Science

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Nano-second Laser-induced Plasma Shock Wave in Air for Non-contact Vibration Tests

Cited by 24 publications

References 41 publications

High spatial and temporal resolution measurement of mechanical properties in hydrogels by non-contact laser excitation

High spatial and temporal resolution measurement of mechanical properties in hydrogels by non-contact laser excitation

Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave

Assessment of Dynamic Young’s Modulus and Damping Ratio of Bamboo Fiber Reinforced Polymer Composites using Shock Wave

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