Lightweight, broadband Rayleigh wave transducer

1985 ◽  
Vol 77 (2) ◽  
pp. 776-776
Author(s):  
Mark B. Moffett
Keyword(s):  
Rayleigh Wave ◽  
Wave Transducer

An Ultrasonic Rayleigh Wave Transducer and its Application to Nondestructive Pressure Measurement

2015 ◽  
Vol 742 ◽  
pp. 11-16 ◽  
Author(s):  
Zhang Wei Ling ◽  
Wei Yong Cai ◽  
Chao Li ◽  
Wei Can Guo
Keyword(s):  
Time Delay ◽  
Rayleigh Wave ◽  
Pressure Measurement ◽  
Engineering Application ◽  
Measurement Model ◽  
Ultrasonic Waves ◽  
Effect Of Temperature ◽  
Maximum Absolute Error ◽  
Piezoelectric Elements ◽  
Wave Transducer

An ultrasonic Rayleigh wave transducer was designed for nondestructive pressure measurement in vessels. Using polyimide resin as the wedge material, the Rayleigh wave transducer had two piezoelectric elements which were placed in the same wedge with a certain distance. Variations in pressure and temperature of vessels can affect the velocity of ultrasonic waves, which will affect variations in time delay in receiving of the same Rayleigh wave with the two piezoelectric elements of the designed transducer. Based on the acoustoelasticity principle and considered the effect of temperature, a practical correlation model between the time delay and both the pressure and temperature of vessels was developed. Using an air vessel as a specimen, Rayleigh wave transducers were arranged in the axial direction of the vessel. The results of temperature experiments show that effect of changes in temperature on time delay agree with the theoretical results. With the calculation temperature compensation in pressure experiment, the relationship between the variations in the time delay caused by changes of pressure and the pressure is established. The pressure measurement results show that the measurement model is effective and the maximum absolute error is 0.09 MPa, which could be acceptable in engineering application.

The surface barrier Rayleigh wave transducer

1979 ◽  
Vol 50 (8) ◽  
pp. 5307 ◽  
Author(s):  
L. Bjerkan ◽  
J. O. Fossum ◽  
K. Fossheim
Keyword(s):  
Rayleigh Wave ◽  
Surface Barrier ◽  
Wave Transducer

A Flexible Rayleigh Wave Transducer for Surface Cracks Detection on Heterogeneous Composite Explosives

2021 ◽  
Vol 64 (3) ◽  
pp. 420-426
Author(s):  
Zuguang Zhang ◽  
Bin Wu ◽  
Zhanfeng Yang ◽  
Pan Xiao ◽  
Weibin Zhang ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Surface Cracks ◽  
Composite Explosives ◽  
Wave Transducer

Rayleigh Wave in a Rotating Magneto-Thermo-Elastic Half-Plane

2012 ◽  
Vol 42 (4) ◽  
Author(s):  
Baljeet Singh ◽  
Sangeeta Kumari ◽  
Jagdish Singh
Keyword(s):  
Rayleigh Wave ◽  
Half Plane

OBSERVATION AND SIMULATION OF TSUNAMIS INDUCED BY THE 2003 TOKACHI-OKI EARTHQUAKE (M 8.0)

2015 ◽  
Vol 2 (3) ◽  
Author(s):  
Tatsuo Ohmachi ◽  
Shusaku Inoue ◽  
Tetsuji Imai
Keyword(s):  
Rayleigh Wave ◽  
Water Pressure ◽  
Near Field ◽  
Source Region ◽  
Tsunami Source ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Tsunami Simulation ◽  
Sea Bed ◽  
Band Pass

The 2003 Tokachi-oki earthquake (MJ 8.0) occurred off the southeastern coast of Tokachi, Japan, and generated a large tsunami which arrived at Tokachi Harbor at 04:56 with a wave height of 4.3 m. Japan Marine Science and Technology Center (JAMSTEC) recovered records of water pressure and sea-bed acceleration at the bottom of the tsunami source region. These records are first introduced with some findings from Fourier analysis and band-pass filter analysis. Water pressure disturbance lasted for over 30 minutes and the duration was longer than those of accelerations. Predominant periods of the pressure looked like those excited by Rayleigh waves. Next, numerical simulation was conducted using the dynamic tsunami simulation technique able to represent generation and propagation of Rayleigh wave and tsunami, with a satisfactory result showing validity and usefulness of this technique. Keywords: Earthquake, Rayleigh wave, tsunami, near-field

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