Journal ArticleDOI
An innovative application of the Hilbert transform to time delay estimation of overlapped ultrasonic echoes
Bertrand Audoin,J. Roux +1 more
Reads0
Chats0
TLDR
In this article, an innovative process based on using the Hilbert transform of the impulse response evaluated from the two signals is proposed to estimate the time delay between two received signals, where a pure delay is transformed in a hyperbola whose vertical asymptote is located at a time yielding to the unknown shift in time.About:
This article is published in Ultrasonics.The article was published on 1996-03-01. It has received 30 citations till now. The article focuses on the topics: Group delay and phase delay & Impulse response.read more
Citations
More filters
Journal ArticleDOI
Optimal recovery of the elasticity tensor of general anisotropic materials from ultrasonic velocity data
TL;DR: In this paper, an ultrasonic wave approach is presented for the optimal identification of the 21 independent elasticity constants of the most general linear homogeneous anisotropic elastic solid from wave speed measurements of obliquely incident ultrasonic bulk waves.
Journal ArticleDOI
Inelastic behaviour of ceramic-matrix composites
TL;DR: In this paper, a methodology for the formulation and identification of the constitutive laws of ceramic-matrix composites is presented, which relies on an anisotropic damage evaluation that accurately separates the effects of the various damage mechanisms on the non-linear behaviour.
Journal ArticleDOI
Damage induced anisotropy and stiffness reduction evaluation in composite materials using ultrasonic wave transmission
TL;DR: In this article, an approach focused on ultrasonic immersion measurements is proposed to extract the effective stiffness tensors for composites having different level of anisotropic mechanical behavior, and the developed approach has been experimentally validated through several examples of undamaged and damaged materials.
Journal ArticleDOI
Accurate and Fast Demodulation Algorithm for Multipeak FBG Reflection Spectra Using a Combination of Cross Correlation and Hilbert Transformation
TL;DR: In this paper, a combined cross correlation and Hilbert transform-based demodulation algorithm for tracking the wavelength shifts of fiber Bragg gratings (FBGs) having a multiple peak reflection spectrum is presented.
Journal ArticleDOI
Estimating ultrasonic time-of-flight through echo signal envelope and modified Gauss Newton method
TL;DR: In this paper, a novel method for ultrasonic time-of-flight (TOF) estimation through envelope is proposed, where wavelet denoising technique is applied to the noisy echo to improve the estimation accuracy.
References
More filters
Book
Acoustic Fields and Waves in Solids
TL;DR: In this article, the authors apply the material developed in the Volume One to various boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides and resonators).
Journal ArticleDOI
On the Theory of Dispersion of X-Rays
TL;DR: In this article, a general formula for the index of refraction in terms of the atomic absorption coefficient α and the critical frequencies is given, from the condition, experimentally verified, that the electrons in the atom for impressed frequencies, large compared to their natural frequencies, shall act like free electrons as far as the index is concerned, a relation is obtained for α.
Journal ArticleDOI
Kramers–Kronig relationship between ultrasonic attenuation and phase velocity
TL;DR: In this paper, Kramers-Kronig relations linking attenuation and dispersion are presented for a linear acoustic system and approximate, nearly local expressions relating the ultrasonic attenuation at a specific frequency to the local frequency derivative of the phase velocity are derived.
Méthodes et techniques de traitement du signal et application aux mesures physiques. Tome 2
TL;DR: The densite reference record was created on 2005-11-18, modified on 2016-08-08 as discussed by the authors, and it was used for densite correlation analysis and correlation analysis.
Journal ArticleDOI
Measurement of the elastic constants of fibre composites by ultrasonics
TL;DR: In this article, a method of measuring the elastic constants of fiber reinforced composites using ultrasonic pulse techniques is described, which enables measurement of both longitudinal and shear wave velocities over a wide range of direction.
Related Papers (5)
Ultrasonic Evaluation of Stiffness Tensor Changes and Associated Anisotropic Damage in a Ceramic Matrix Composite
B. Audoin,S. Baste +1 more
Model-based estimation of ultrasonic echoes. Part I: Analysis and algorithms
Ramazan Demirli,Jafar Saniie +1 more
Double through‐transmission bulk wave method for ultrasonic phase velocity measurement and determination of elastic constants of composite materials
Stanislav I. Rokhlin,W. Wang +1 more