Journal ArticleDOI
Laser generation and detection of ultrasound in concrete
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TLDR
In this paper, the authors examined the scattering of ultrasonic waves in undamaged concrete and established the fundamentals for the application of laser ultrasonics for the material characterization and nondestructive evaluation of concrete.Abstract:
Laser ultrasonic techniques are used to examine the propagation of ultrasonic waves in concrete. This optical methodology provides a repeatable, broad band generation source and an absolute detection system that does not interfere with the process being monitored. The presence of aggregate, in addition to voids and flaws, can cause wave scattering in concrete. Fast Fourier Transform techniques are used to determine the effect of aggregate size and propagation distance on the frequency content of both surface and body waves. This paper examines the scattering of ultrasonic waves in undamaged concrete and establishes the fundamentals for the application of laser ultrasonics for the material characterization and nondestructive evaluation of concrete.read more
Citations
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Journal ArticleDOI
High-Temperature Piezoelectric Sensing
TL;DR: An overview of high-temperature piezoelectric sensing techniques including accelerometer, surface acoustic wave sensor, ultrasound transducer, acoustic emission sensor, gas sensor, and pressure sensor for temperatures up to 1,250 °C are presented.
Journal ArticleDOI
Effect of Aggregate Size on Attenuation of Rayleigh Surface Waves in Cement-Based Materials
TL;DR: In this article, the effect of aggregate size on the attenuation of Rayleigh surface waves in cement-based materials was investigated using a dual-probe heterodyne interferometer.
Journal ArticleDOI
Acoustic Emission Source Location Using Lamb Wave Modes
TL;DR: In this article, the dispersive nature of Lamb wave propagation in plates makes it possible to perform a linear source location of AE events based on the arrival of different frequency components (Lamb wave modes) of an AE event at a single transducer.
Journal ArticleDOI
Analysis of coherent surface wave dispersion and attenuation for non-destructive testing of concrete.
TL;DR: Adapted signal processing technique are presented to evaluate the coherent phase and group velocities and also the coherent attenuation parameter, and the sensitivity of these three parameters with the properties of concrete is discussed, as well as the necessity to use coherent waves to obtain accurate results.
Journal ArticleDOI
Point and line source laser generation of ultrasound for inspection of internal and surface flaws in rail and structural materials
TL;DR: In this paper, laser-based ultrasound and air-coupled ultrasound test methods were used for the inspection of flowed rail, internal, and surface-breaking cracks in railroad tracks.
References
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Wave propagation in elastic solids
TL;DR: In this article, the linearized theory of elasticity was introduced and the elasticity of a one-dimensional motion of an elastic continuum was modeled as an unbound elastic continuum.
Journal ArticleDOI
The behaviour of ultrasonic pulses in concrete
TL;DR: In this article, the role of compositeness, dispersion, and a feature-based computer system is discussed among others, and the practical consequences of these findings are pointed out.
Journal ArticleDOI
Detecting Delaminations in Concrete Slabs With and Without Overlays Using the Impact-Echo Method
TL;DR: In this paper, the authors demonstrate the feasibility of detecting delaminations in reinforced concrete slabs using the impact-echo method, a non-destructive testing technique based on transient stress wave propagation.
Journal ArticleDOI
Some applications of laser ultrasound
TL;DR: In this paper, the authors discuss some potential industrial applications for laser ultrasound, illustrated by examples of recent laboratory demonstrations of its potential for nondestructive testing and materials characterization, where laser ultrasonic techniques are only likely to find industrial application where they answer a need that cannot be met by conventional transducers.