Application of Air-Coupled Ultrasonic Arrays for Excitation of a Slow Antisymmetric Lamb Wave
Sensors, 2018 Air-coupled excitation and reception of ultrasonic guided waves is already used for non-destructive testing and evaluation (NDT & E). Usually for air-coupled NDT & E purposes the lowest zero-order antisymmetric Lamb wave mode A0 is used, because ...
Rymantas J. Kazys +2 more
doaj +1 more source
SensorsUltrasonic guided waves, which are often generated and detected by piezoelectric transducers, are well established to monitor engineering structures. Wireless solutions are sought to eliminate cumbersome wire installation. This work proposes a method for
Marilyne Philibert, Kui Yao
doaj +1 more source
Sparse-TFM Imaging of Lamb Waves for the Near-Distance Defects in Plate-Like Structures
Metals, 2019 The ultrasonic phased array total focusing method (TFM) has the advantages of high imaging resolution and high sensitivity to small defects. However, it has a long imaging time and cannot realize near-distance defect imaging, which limits its application
Haiyan Zhang +5 more
doaj +1 more source
An Ultrasonic analog for a laser
, 2005 We report measurements on ultrasonic systems analogous to random lasers. One system entails unstable ultrasonic feedback between distinct transducers, another involves a piezoelectric device that emits spontaneously and by stimulation.
Lobkis, Oleg I +2 more
core +1 more source
Non-contact ultrasonic stress measurement using lamb waves
NDT & E InternationalAbstract: Stress measurement is essential in many applications such as aerospace or construction, and ultrasonic stress measurement systems are removable and non-destructive. Using air-coupled ultrasound has the advantage of being non-contact. In other works, an air-coupled ultrasonic phased array is used to adjust the coupling angle and then measure ...
Christoph Haugwitz +10 more
openaire +2 more sources
Determination of plate wave velocities and diffuse field decay rates with braod-band acousto-ultrasonic signals [PDF]
Lowest symmetric and lowest antisymmetric plate wave modes were excited and identified in broad-band acousto-ultrasonic (AU) signals collected from various high temperature composite materials.
Kautz, Harold E.
core +1 more source
Experimental and numerical polar scans of several anisotropic materials using pulsed and harmonic ultrasonic beams [PDF]
, 2011 Ultrasonic non-destructive testing is a well known technique in present days, in which the C-scan is the most wide spread. Though, because of the inherent limitations of most methods to quantitatively characterize (damaged) composite materials, the quest
De Baere, Ives +6 more
core
Material Characterization of Fiber-Reinforced Composites Using Air Coupled Ultrasonic Polar Scans
Research and Review Journal of Nondestructive TestingThe widespread use of fiber-reinforced composites is partly due to their high weight-specific mechanical properties. Due to their complex structure, however, there are high demands on quality assurance.
Julian Würthner, Marc Kreutzbruck
doaj +1 more source
Effects of the pipe-joints on acoustic emission wave propagation velocity [PDF]
, 2008 In jointed-pipes, a variety of different acoustic emission (AE) waves can be generated by way of mode conversion, wave reflection and wave transmission from a joint. This can lead to interference waves as resulting complicated signals propagate along the
Au, YHJ, Wichaidit, W
core
Experimental evaluation of three leak detection and location concepts for space stations [PDF]
Three leak (or precursor damage modes) detection and location concepts for space station overboard leakage were evaluated experimentally. The techniques are: (1) static and dynamic seal leak detector sensing of moisture or all gases in space cabin ...
Kazokas, G. P. +4 more
core +1 more source