Classification of Iron Meteorites with High Frequency Ultrasonic Waves

2019 ◽  
Vol 24 (2) ◽  
pp. 277-284
Author(s):  
Dris El Abassi ◽  
Bouazza Faiz ◽  
Abderrahmane Ibhi ◽  
Idris Aboudaoud
Keyword(s):  
Phase Velocity ◽  
Acoustic Impedance ◽  
Nickel Content ◽  
Normal Incidence ◽  
Ultrasonic Pulse ◽  
Ultrasonic Waves ◽  
Iron Meteorites ◽  
Acoustic Transducer ◽  
Pulse Echo ◽  
Non Destructive

We present the results of an ultrasonic pulse-echo technique and its potential to classify iron meteorites into hexahedrites, octahedrites and ataxites by determining their acoustic impedance and phase velocity. Our technique has been adapted from those used in the field of ultrasonic non-destructive investigation of a variety of materials. The main advantage of our technique is that it does not need any preparation of the meteorites like cutting and etching and therefore is rapid, easy and non-destructive. In essence, a broadband acoustic transducer is used in a monostatic pulse-echo configuration which means that both the transducer and the meteorite sample are located in a water bath and adjusted in the way that the ultrasonic pulse shit the meteorite sample at normal incidence. Then the reflected pulses from the front and rear faces of the meteorite sample are measured with the emitting transducer, digitally recorded and processed to analyze the signal. After Fourier transforming the echoed pulses from the front and the rear face of the meteorite sample, the calculated reflection coefficients yield the phase velocity and the acoustic impedance. Our study investigates a variety of iron meteorites collected in Morocco and other countries and it helps to understand how the nickel content of these meteorites affects the acoustic impedance. It reveals that the acoustic impedance of iron meteorites increases with increasing nickel content, so that a further refinement of our technique might have the potential to classify iron meteorites directly and reliably into hexahedrites, octahedrites and ataxites without destroying them.

Classification of Iron Meteorites with High Frequency Ultrasonic Waves

2019 ◽  
pp. 08-11
Keyword(s):  
Phase Velocity ◽  
Acoustic Impedance ◽  
Nickel Content ◽  
Normal Incidence ◽  
Ultrasonic Pulse ◽  
Ultrasonic Waves ◽  
Iron Meteorites ◽  
Rear Face ◽  
Pulse Echo ◽  
Non Destructive

The results of our study of an ultrasonic pulse-echo technique for its potential to classify iron meteorites into hexahedrites, octahedrites and ataxites by determining their acoustic impedance and phase velocity is presented in this article. Our technique has been adapted from those used in the field of ultrasonic non-destructive investigation of a variety of materials. The main advantage of our technique is that it does not need any preparation of the meteorites like cutting and etching and therefore is rapid, easy and non-destructive. In essence, a broadband acoustic transducer is used in a monostatic pulse-echo configuration which means that both the transducer and the meteorite sample are located in a water bath and adjusted in the way that the ultrasonic pulses hit the meteorite sample at normal incidence. Then the reflected pulses from the front and rear face of the meteorite sample are measured with the emitting transducer, digitally recorded and processed to analyze the signal. After Fourier transforming the echoed pulses from the front and the rear face of the meteorite sample, the calculated reflection coefficients yield the phase velocity and the acoustic impedance. Our study concerning a variety of iron meteorites collected in Morocco and other countries helps to understand how the nickel content of these meteorites affects the acoustic impedance. It reveals that the acoustic impedance of iron meteorites increases with increasing nickel content, so that a further refinement of our technique might have the potential to classify iron meteorites directly and reliably into hexahedrites, octahedrites and ataxites without destroying them.

scholarly journals A sound approach: Exploring a rapid and non-destructive ultrasonic pulse echo system for vegetable oils characterization

2019 ◽  
Vol 125 ◽  
pp. 108552 ◽  
Author(s):  
Jing Yan ◽  
William M.D. Wright ◽  
James A. O'Mahony ◽  
Yrjö Roos ◽  
Eric Cuijpers ◽  
...  
Keyword(s):  
Vegetable Oils ◽  
Ultrasonic Pulse ◽  
Pulse Echo ◽  
Non Destructive

scholarly journals 3D Internal Visualization of Concrete Structure Using Multifaceted Data for Ultrasonic Array Pulse-Echo Tomography

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6681
Author(s):  
Hungjoo Kwon ◽  
Changbin Joh ◽  
Won Jong Chin
Keyword(s):  
Evaluation Method ◽  
Ultrasonic Pulse ◽  
Evaluation Tool ◽  
Limited Budget ◽  
Pulse Peak ◽  
Synthetic Aperture Focusing ◽  
Synthetic Aperture Focusing Technique ◽  
Pulse Echo ◽  
Structure Evaluation ◽  
Non Destructive

This research proposes a 3D internal visualization using ultrasonic pulse-echo tomography technique to evaluate accurately the state of concrete structures for their efficient maintenance within a limited budget. Synthetic aperture focusing technique (SAFT) is used as a post-processing algorithm to manipulate the data measured by the ultrasonic pulse-echo technique. Multifaceted measurements improve the weakness of the existing ultrasonic pulse-echo tomography technique that cannot identify the area beyond a reflector as well as the area located far away from measuring surfaces. The application of apodization factor, pulse peak delay calibration and elimination of trivial response not only complements the weaknesses of the SAFT algorithm but also improves the accuracy of the SAFT algorithm. The results show that the proposed method reduces the unnecessary surface noise and improves the expressiveness of the reflector’s boundaries on the resulting images. It is expected that the proposed 3D internal visualization technique will provide a useful non-destructive evaluation tool in combination with another structure evaluation method.

THE FEATURES OF NON-DESTRUCTIVE INSPECTION OF CARBON FIBER REINFORCED PLASTIC SOLID LAMINATE SAMPLES DURING LOW-CYCLIC FATIGUE TESTING

2020 ◽  
pp. 108-115
Author(s):  
A.S. Boychuk ◽  
◽  
I.A. Dikov ◽  
A.S. Generalov ◽  
S.I. Yakovleva ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Ultrasonic Inspection ◽  
Cyclic Fatigue ◽  
Ultrasonic Pulse ◽  
Back Wall ◽  
Testing Specimen ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Pulse Echo ◽  
Non Destructive

The results of CFRP samples ultrasonic inspection during low-cyclic fatigue testing are given in this article. It is established that for ultrasonic pulse-echo inspection during cycling mechanical testing and after the special correction of flaw detector’s gain and inspection’s sensitivity concerning back-wall echo decreasing in compare with testing specimen is necessary.

scholarly journals Structural Audit of Old Building And It's Strengthening : Review

2020 ◽  
pp. 563-566
Author(s):  
Monis Azhar Ansari ◽  
Shrikant Solanke ◽  
Aashish Soni
Keyword(s):  
Human Life ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Rebound Hammer ◽  
Destructive Test ◽  
Prone Area ◽  
Pulse Echo ◽  
Non Destructive ◽  
Pulse Echo Method

We are building the structures rapidly in the area where there is requirement of the structures. Every structure has its own service life. Every structure is designed by assuming its life of existence. Some of the structures gets more life than expected and some gets fail in achieving its life. Any technology or material has its limitation to withstand. Many of the structures of R.C.C. are located in Seismic prone area. The structures gets damaged due to earthquake and the structures which becomes old should be checked that whether it has the strength of existence or not. The structures should be audited timely for the safety of the human life as well as for the nearby structures. The structures can be checked by various methods of Non-Destructive Test (Rebound Hammer Test, Ultrasonic Pulse Velocity Method, Pulse Echo Method, Probe Penetration Test, Destructive Test. Rebound Hammer Test of Non-Destructive Test is used in this paper to check the strength of an institutional building. When examining the structure, this paper aims to expand the life of structure. Different techniques of Retrofitting is given to the structural member which is unsafe. By applying the retrofitting, the structure can be made safe.

scholarly journals Acoustic non-destructive testing of high temperature degraded concrete with comparison of acoustic impedance

2018 ◽  
Vol 219 ◽  
pp. 03003
Author(s):  
Richard Dvořák ◽  
Zdeněk Chobola ◽  
Ivo Kusák
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Acoustic Impedance ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Destructive Testing ◽  
Impact Echo ◽  
Destructive Measurement ◽  
Non Destructive

The paper is focused on non-destructive measurement of high temperature degraded concrete test specimens of three mixtures different by the use of coarse aggregate. Testing is done by ultrasonicpulse velocitymethod and Impact-Echo method. Non-destructive results are compared with destructive tests. Ultrasonic pulse velocity, dominant resonance frequency and acoustic impedance are discussed and compared with changes in density, cubic compressive strength, and tensile strength of concrete. The paper suggests possible assessment of degraded concrete by the change in acoustic impedance dependent on residual tensile strength.

scholarly journals Non-destructive Evaluation of Voids in Kamaboko by an Ultrasonic Pulse Echo Technique.

1994 ◽  
Vol 41 (12) ◽  
pp. 897-903 ◽  
Author(s):  
Rikuo TAKAI ◽  
Tooru SUZUKI ◽  
Tomoo MIHORI ◽  
Seigi CHIN ◽  
Yumiko HOCCHI ◽  
...  
Keyword(s):  
Ultrasonic Pulse ◽  
Non Destructive Evaluation ◽  
Pulse Echo ◽  
Non Destructive

scholarly journals Non-Destructive Evaluation of Coating Thickness Using Water Immersion Ultrasonic Testing

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1421
Author(s):  
Jiannan Zhang ◽  
Younho Cho ◽  
Jeongnam Kim ◽  
Azamatjon Kakhramon ugli Malikov ◽  
Young H. Kim ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Water Immersion ◽  
Ultrasonic Pulse ◽  
Marine Structures ◽  
Destructive Testing ◽  
Testing Environment ◽  
High Attenuation ◽  
The Time Domain ◽  
Pulse Echo ◽  
Non Destructive

The coating is applied to prevent corrosion on the surface of ships or marine structures, and the thickness of the coating affects its anti-corrosion effect. As a result, non-destructive testing (NDT) is required to measure coating thickness, and ultrasonic NDT is a convenient and quick way to measure the thickness of underwater coatings. However, the offshore coating’s energy attenuation and absorption rates are high, the ultrasonic pulse echo test is difficult, and the testing environment is harsh. Because of the coating’s high attenuation, the distance of the optimal water delay line designed based on the reflection coefficient of the vertically incident wave is used. To accurately measure the thickness of the coating material, TOF of the reflected echo on the time-domain waveform was evaluated. The experimental results show that, when compared to caliper measurements, the coating thickness measured by the proposed method has a lower error and can be used for accurate measurement. The use of ultrasonic water immersion measurement is almost limitless in terms of size, location, and material of the object to be measured, and it is expected to be used to measure the thickness of the surface coating of ships or marine structures in the water.

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