Interaction of pulse ultrasonic signals with reflectors of different types

Перов, Д. В.; Ринкевич, А. Б.; Nemytova, Olga V.

doi:10.1134/s1061830907060034

Cited by 6 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let there be some analyzed signal s(t) that depends on time t. Complex analytic signalż(t) corresponding to the said analyzed signal can be obtained with the use of Hilbert transform H[s(t)] [7,8]:…”

Section: Algorithms For Determining the Instantaneous Frequencymentioning

confidence: 99%

“…Note that some papers (e.g., [5,6]) point to the fact that the aforementioned procedures for determining the frequency are not always adequate for practical situations and the results obtained through them may be different from each other. In our opinion, the techniques currently employed to determine the vibration frequencies during ultrasonic NDT do not adequately take into account the peculiarities of real echo pulses reflected by [7,8]. Because the practical application of this approach is limited by its very low noise immunity, we have proposed a modified version of this technique based on regularization of the procedure for determining the instantaneous signal frequency with the use of the wavelet transform.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Frequency Features of Pulse Echoes from Different Reflectors

Ринкевич

Nemytova

Перов

2011

ISRN Mechanical Engineering

View full text Add to dashboard Cite

Correspondence should be addressed to Dmitry V. Perov, peroff@imp.uran.ru The analysis of interaction of ultrasonic pulses with different reflectors which are located in elastic media is carried out. A parameter which allows estimating the form of reflector is instantaneous frequency of pulse-echo. This parameter is an unsteady pulse echo characteristic. Instantaneous frequency determination algorithm is to use wavelet transformation which has increased noise immunity. It is shown that the instantaneous frequency value for a pulse echo is often shifted from a rated frequency of piezoelectric transducer. Difference between the frequencies extensively depends on the reflector form.

show abstract

Section: Algorithms For Determining the Instantaneous Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Frequency Features of Pulse Echoes from Different Reflectors

Ринкевич

Nemytova

Перов

2011

ISRN Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Finally, all materials tend to act to some degree as a low pass filter, attenuating or scattering the higher frequency components of a broadband wave more than the lower frequency components. Thus, analysis of changes in the remaining frequency content of a selected broadband pulse that has passed through the test material can keep track of the combined effects of attenuation and scattering as previously described [17][18][19].…”

Section: Generalities On Acoustic Methodsmentioning

confidence: 99%

Non-Destructive Testing of Stone Masonry using Acoustic Attenuation Tomography Imaging

Concu¹,

Nicolo²,

Piga³

et al.

Civil-Comp Proceedings

View full text Add to dashboard Cite

In this paper, the computerised acoustic attenuation tomography imaging has been analysed, implemented and then performed for non destructive testing of a stone masonry. The tomography implies that a ill posed linear equations system has to be solved, in order to determine the attenuation distribution inside the tested structure, thus highlighting the presence of anomalies. The algebraic problem of the attenuation tomography inversion has been deepened, and the solving algorithm has been numerically developed. The entire process has been implemented in an automated procedure that allows the user to easily obtain a map of the attenuation distribution in the tomographic section of the object.

show abstract

Ultrasonics for the Diagnosis of a Trachite Stone Wall

Carcangiu

Montisci

Forcinetti

2014

Ultrasonic Nondestructive Evaluation Systems

View full text Add to dashboard Cite

The aim of this chapter is to show the potentiality of a novel approach to ultrasonic investigation of masonry structures. In order to obtain useful, rapid and relatively low cost informations, the ultrasonic “Direct Transmission Technique” is applied on the structure under exam. This technique uses a beam of ultrasonic waves emitted by a transducer and received by another one placed on the opposite surface of the structure. The waves pass through the (ample under test) and are reflected and refracted by incidental discontinuities encountered along the path. The characteristics of the ultrasonic vibration are then investigated in order to obtain interesting information on the conditions of the materials. In particular, the attention has been focused on the correlation between the average density of the ray paths and the characteristics of acquired signals. This feature has been extracted from signals obtained by direct measurements on a real stone masonry with a known internal cavity. Then measurements have been related to the known geometry to verify the actual correlation with the characteristics of the traversed paths

show abstract

Interaction of pulse ultrasonic signals with reflectors of different types

Cited by 6 publications

References 2 publications

Comparison of Frequency Features of Pulse Echoes from Different Reflectors

Comparison of Frequency Features of Pulse Echoes from Different Reflectors

Non-Destructive Testing of Stone Masonry using Acoustic Attenuation Tomography Imaging

Ultrasonics for the Diagnosis of a Trachite Stone Wall

Contact Info

Product

Resources

About