Results 141 to 150 of about 1,309 (186)
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Excitation of ultrasonic Lamb waves in composite membranes
1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium, 2002The excitation of ultrasonic Lamb waves by an interdigital transducer in a composite plate consisting of a piezoelectric thin film deposited on a nonpiezoelectric membrane is analyzed using the Green's function method. The amplitudes of the generated waves are obtained in terms of the charge density on transducer electrodes.
S.G. Joshi, Y. Jin
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Silicon-based ultrasonic Lamb-wave multisensors
IEEE Technical Digest on Solid-State Sensor and Actuator Workshop, 2003Initial experimental, analytical, and numerical evaluations are described of a microsensor that uses ultrasonic Lamb wave propagating in a thin plate supported by a silicon die. Because it is sensitive to many measurands, the device could operate as a microphone, biosensor, chemical vapor or gas detector, scale, pressure sensor, densitometer ...
S.W. Wenzel, R.M. White
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Excitation of ultrasonic Lamb waves in piezoelectric plates
Journal of Applied Physics, 1991The excitation of ultrasonic Lamb waves by an interdigital transducer (IDT) deposited on a piezoelectric plate is analyzed using the Green’s-function method. The amplitudes of the generated Lamb waves are obtained in terms of the charge density on transducer electrodes.
S. G. Joshi, Y. Jin
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A multisensor employing an ultrasonic Lamb-wave oscillator
IEEE Transactions on Electron Devices, 1988Initial experimental, analytical, and numerical evaluations of a microsensor that uses ultrasonic Lamb waves propagating in a thin plate supported by a silicon die are presented. Changes of oscillator frequency indicate magnitudes of the variables sensed.
S.W. Wenzel, R.M. White
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Mixing of ultrasonic Lamb waves in thin plates with quadratic nonlinearity
Ultrasonics, 2018This paper investigates the propagation of Lamb waves in thin plates with quadratic nonlinearity by one-way mixing method using numerical simulations. It is shown that an A0-mode wave can be generated by a pair of S0 and A0 mode waves only when mixing condition is satisfied, and mixing wave signals are capable of locating the damage zone. Additionally,
Feilong, Li +3 more
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Theory of acoustic streaming generated by ultrasonic Lamb waves
Journal of the Acoustical Society of America, 1998A theory on acoustic streaming generated by Lamb waves propagating in a thin composite membrane was developed. Using this theory, the mass-transport velocity in water, which is loaded on a 4-μm-thick membrane, due to Lamb waves at 4.7 MHz was calculated. The results are in good agreement with the experimental values measured by Moroney et al.
Junru Wu, Xiaoliang Zhao
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Laser-ultrasonic generation of Lamb waves in the reaction force range
Ultrasonics, 2003The Laser-ultrasonic generation of Lamb waves in an elastic plate is investigated theoretically and experimentally for a laser source whose intensity is high enough to create reaction forces (normal tractions) on the illuminated surface of the specimen.
Yijun, Shi, Shi-Chang, Wooh, Mark, Orwat
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Leaky Lamb Waves for the Ultrasonic Nondestructive Evaluation of Adhesive Bonds
Journal of Engineering Materials and Technology, 1990The critical role played by interface zones in the fracture and failure of composites and other bonded materials is well known. However, the existing nondestructive evaluation methods are not capable of yielding useful quantitative information on either elastic or strength related properties of the interface.
A.K. Mal, P.-C. Xu, Y. Bar-Cohen
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Design and characterization of an ultrasonic lamb-wave power delivery system
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2013In this paper, a novel design for an ultrasonic power transmission system designed for use in aircraft structural monitoring systems is described. The prototype system uses ultrasonic Lamb waves to carry energy along plates, such as those used in aircraft structures, and commercially available piezoelectric patch transducers as the transmitter and ...
Aleksander, Kural +6 more
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Reflection of ultrasonic Lamb waves produced by thin conducting strips
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1999The reflection of ultrasonic Lamb waves produced by a periodic array of thin conducting strips deposited on a piezoelectric plate was investigated both theoretically and experimentally. A repetitively mismatched transmission line model was used to analyze the performance of the reflector.
B D, Zaitsev, S G, Joshi
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