Noncontacting ultrasonic and electromagnetic HTS tape NDE

Telschow, K. L.; Bruneel, F.; Walter, John B.; Koo, L.S.

doi:10.1109/77.620768

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…The high peak optical powers associated with pulsed laser systems (e.g. Nd:YAG) can be utilised to provide a short rise-time and spatially localised expansion source in samples, which in turn serves as a source of broadband elastic stress waves [59]. High power laser energy focussed over a small area leads to two phenomena: thermoeleastic expansion (incident power below 10 7 W/cm 2 ) and ablation (incident power above 10 7 Wjcm 2 ; the source works in plasma regime), as explained in [51].The former is nondestructive; ultrasound is generated due to constrained local rapid expansion.…”

Section: Non-contact Techniquesmentioning

confidence: 99%

Structural Health Monitoring Using Guided Ultrasonic Waves

Staszewski

2004

Advances in Smart Technologies in Structural Engineering

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Section: Non-contact Techniquesmentioning

confidence: 99%

Structural Health Monitoring Using Guided Ultrasonic Waves

Staszewski

2004

Advances in Smart Technologies in Structural Engineering

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“…The high peak optical powers associated with pulsed laser systems (e.g. Nd:YAG) can be utilized to provide a short rise-time and spatially localized expansion source in samples, which in turn serves as a source of broadband elastic stress waves [21]. High power laser energy focused over a small area leads to two phenomena: thermoelastic expansion (nondestructive) and ablation (destructive).…”

Section: Introductionmentioning

confidence: 99%

Structural health monitoring using scanning laser vibrometry: I. Lamb wave sensing

Staszewski

Mallet

et al. 2004

Smart Mater. Struct.

271

161

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Structural health monitoring using Lamb waves is based on guided waves introduced to a structure at one point and sensed at a different location. Actuation and sensing can be accomplished using various types of transducer. The paper demonstrates a non-contact method for low-frequency Lamb wave sensing. The technique utilizes a laser Doppler velocimeter. Lamb wave responses are enhanced using data smoothing and filtering procedures. The results are validated using classical piezoceramic-based sensing and numerical simulations. The study shows the potential of laser vibrometry for Lamb wave sensing.

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Photoacoustic determination of tension in magnetic tape

Imaino

2004

Microsystem Technologies

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A non-contact method, using photoacoustically generated antisymmetric Lamb waves detected with a laser Doppler technique, is used for determining tension in magnetic tape. For the tape samples used in this study, the bending stiffness contributes as much to the overall stiffness as a 1 Newton tension force, so an accurate determination of the tension must also necessarily include an independent measurement of the bending stiffness. Our data shows that the flexural velocity normal to the direction of the applied tension provides a determination of the bending stiffness independent of tension. The dependence of the wavespeed on tension is measured, showing the expected tension dependence and demonstrating the utility of this approach.

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Noncontacting ultrasonic and electromagnetic HTS tape NDE

Abstract: Abstract--Two noncontacting nondestructive evaluation techniques, one electromagnetic the other ultrasonic, for inspection of high temperature superconducting tapes are described. Results for Ag-clad BSCCO tapes are given.

Cited by 3 publications

References 7 publications

Structural Health Monitoring Using Guided Ultrasonic Waves

Structural Health Monitoring Using Guided Ultrasonic Waves

Structural health monitoring using scanning laser vibrometry: I. Lamb wave sensing

Photoacoustic determination of tension in magnetic tape

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