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Lemlikchi, S., Martinsson, J., Hamrit, A., Djelouah, H., Asmani, M. & Carlson, J. E. (2019). Correction to: Ultrasonic Characterization of Thermally Sprayed Coatings [Letter to the editor]. Journal of thermal spray technology (Print), 28(3), 591
Open this publication in new window or tab >>Correction to: Ultrasonic Characterization of Thermally Sprayed Coatings
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2019 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 28, no 3, p. 591-Article in journal, Letter (Refereed) Published
Abstract [en]

The first name of author Ahmed Hamrit was misspelled as “Ahmet” in the original article. Please note that the correct spelling of his name is “Ahmed” as shown in this correction. 

Place, publisher, year, edition, pages
Springer, 2019
National Category
Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering Probability Theory and Statistics
Research subject
Mathematical Statistics; Signal Processing
Identifiers
urn:nbn:se:ltu:diva-73058 (URN)10.1007/s11666-019-00842-8 (DOI)000459400600022 ()2-s2.0-85061027570 (Scopus ID)
Note

Erratum in: Journal of Thermal Spray Technology, 2019, 28, 3, 391–404, DOI: 10.1007/s11666-019-00832-w

Available from: 2019-02-27 Created: 2019-02-27 Last updated: 2019-03-11Bibliographically approved
Onur, T. Ö., Carlson, J. E. & Svanström, E. (2019). Estimation of the Propagation of Flexural Waves in Thin Plates Using a Single Low Cost Sensor. Iranian Journal of Science and Technology, Transactions of Electrical Engineering
Open this publication in new window or tab >>Estimation of the Propagation of Flexural Waves in Thin Plates Using a Single Low Cost Sensor
2019 (English)In: Iranian Journal of Science and Technology, Transactions of Electrical Engineering, ISSN 2228-6179Article in journal (Refereed) Epub ahead of print
Abstract [en]

This paper demonstrates how flexural wave propagation in a thin plate can be modeled by estimating the combined effect of the excitation source signal and the impulse response of the ultrasonic sensor. The wave propagation in the plate is modeled using the wave equation for the flexural wave mode. A theoretical model for flexural wave propagation in thin plates has been derived, and it has been compared with measurements excited by tapping gently on the surface. The combined effects of the excitation source signal and the impulse response of the low-cost piezoelectric sensor are modeled using finite-impulse response and/or infinite-impulse response filters. Thereafter, the performances of the selected filters are compared on estimating the wave propagation in a thin quartz glass plate. Results indicate that the most accurate estimation of wave propagation has been obtained using a linear phase filter which attributes all dispersions to the flexural wave.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Flexural waves, Filtering, FIR/IIR, Estimation of wave propagation
National Category
Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering Other Physics Topics
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-71891 (URN)10.1007/s40998-018-0162-5 (DOI)
Available from: 2018-12-05 Created: 2018-12-05 Last updated: 2019-04-10
Lemlikchi, S., Martinsson, J., Hamrit, A., Djelouah, H., Asmani, M. & Carlson, J. E. (2019). Ultrasonic Characterization of Thermally Sprayed Coatings. Journal of thermal spray technology (Print), 28(3), 391-404
Open this publication in new window or tab >>Ultrasonic Characterization of Thermally Sprayed Coatings
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2019 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 28, no 3, p. 391-404Article in journal (Refereed) Published
Abstract [en]

This paper describes the simultaneous determination of the ultrasonic parameters in thermally sprayed coatings. The parameters of interest are the longitudinal wave velocity and the ultrasonic attenuation. The test materials are two cobalt-based coatings (FSX 414 and Diamalloy 4060), both deposited onto stainless steel (310SS) substrates. The ultrasonic measurements were carried out in the pulse-echo configuration using several transducers. The ultrasonic signals reflected from the coatings were successfully estimated using the combined model, together with the maximum likelihood estimation and the Levenberg–Marquardt approach. The best estimate was obtained for 20 MHz measurements. Once the model was validated, the ultrasonic parameters of the thermally sprayed coatings were extracted. Model validation is based on the analysis of the residual between measured and estimated signals. Results showed non-dispersive ultrasonic velocities with average values of (3940±50)m/s" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">(3940±50)m/s(3940±50)m/s in Diamalloy 4060 and (4260±20)m/s" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">(4260±20)m/s(4260±20)m/s in FSX 414. High ultrasonic attenuation with a quadratic frequency dependence was observed for both materials. Moreover, it was found that the ultrasonic parameters in thermally sprayed materials are microstructure dependent. For close densities, the harder the coating, the higher the ultrasonic wave velocity and attenuation.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
combined model, Diamalloy 4060, FSX 414, thermal spray coating, ultrasonic attenuation, ultrasonic wave velocity
National Category
Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering Probability Theory and Statistics
Research subject
Mathematical Statistics; Signal Processing
Identifiers
urn:nbn:se:ltu:diva-72700 (URN)10.1007/s11666-019-00832-w (DOI)000459400600007 ()2-s2.0-85060769510 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-02-27 (svasva)

Available from: 2019-01-27 Created: 2019-01-27 Last updated: 2019-03-11Bibliographically approved
Carlson, J. E., Ranefjärd, S. & Trulsson, F. (2018). A Subspace Based Method for Near Transducer Interference Suppression. In: 2018 IEEE International Ultrasonics Symposium: . Paper presented at 2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; Oct 22-25, 2018. IEEE, Article ID 8579817.
Open this publication in new window or tab >>A Subspace Based Method for Near Transducer Interference Suppression
2018 (English)In: 2018 IEEE International Ultrasonics Symposium, IEEE, 2018, article id 8579817Conference paper, Published paper (Refereed)
Abstract [en]

In applications of direct -contact ultrasound, operating in pulse -echo mode, the transient resulting from the excitation of the transducer will mask any reflections from scatterers near the transducer surface. This results in a so called dead zone, preventing any defects to be detected. This is normally solved by introducing a delay line between the transducer and the specimen. There are drawbacks with this approach, and therefore we propose an alternative technique, which instead suppresses the transient from the excitation by a statistical modeling technique. This paper describes an algorithm for reduction of the dead zone and shows with experiments using both a single -element transducer and a 128 element linear array, that the transient from the transducer excitation can be suppressed sufficiently well to reveal side -drilled holes in a test block, which were previously masked.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-72801 (URN)10.1109/ULTSYM.2018.8579817 (DOI)000458693000152 ()2-s2.0-85060601099 (Scopus ID)978-1-5386-3425-7 (ISBN)978-1-5386-3426-4 (ISBN)
Conference
2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; Oct 22-25, 2018
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-03-11Bibliographically approved
Carlson, J. E., Andren, E., Mohamad, M. & Beek, J. v. (2018). Monitoring Changes in Mechanical Properties of Rock Bolts Using a Low-Power Coded-Excitation Scheme. In: 2018 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS): . Paper presented at 2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; 22-25 Oct 2018. IEEE, Article ID 8580038.
Open this publication in new window or tab >>Monitoring Changes in Mechanical Properties of Rock Bolts Using a Low-Power Coded-Excitation Scheme
2018 (English)In: 2018 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS), IEEE, 2018, article id 8580038Conference paper, Published paper (Refereed)
Abstract [en]

In-situ inspection and quality assessment of rock bolts and other load-bearing structural elements, has received significant attention over the years, but there are still no techniques available capable of monitoring changes over time in mechanical properties of already installed bolts. Since mechanical changes will also affect the propagation of mechanical waves, ultrasound is a strong candidate. In this paper we propose a technique based on Orthogonal Frequency Division Multiplexing (OFDM) for coding the transmitted ultrasound pulse in such a way that the propagation channel (transducer and rock bolt combined) can be estimated. We show that a transmit voltage of 1.1 V r.m.s. is sufficient to obtain reliable channel estimates even in bolts as long as one meter. The channel estimates are then used to predict changes in tensile stress on the bolt, from experiments conducted in a laboratory environment.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 48-5727
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-72802 (URN)10.1109/ULTSYM.2018.8580038 (DOI)000458693001081 ()2-s2.0-85060589109 (Scopus ID)978-1-5386-3425-7 (ISBN)978-1-5386-3426-4 (ISBN)
Conference
2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; 22-25 Oct 2018
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-03-11Bibliographically approved
Carlson, J. E., Ovacikli, A. K. & Pääjärvi, P. (2017). Material Impulse Response Estimation from Overlapping Ultrasound Echoes Using a Compressed Sensing Technique. In: IEEE International Ultrasonics Symposium, IUS: . Paper presented at 2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017. IEEE Computer Society, Article ID 8091788.
Open this publication in new window or tab >>Material Impulse Response Estimation from Overlapping Ultrasound Echoes Using a Compressed Sensing Technique
2017 (English)In: IEEE International Ultrasonics Symposium, IUS, IEEE Computer Society, 2017, article id 8091788Conference paper, Published paper (Refereed)
Abstract [en]

When investigating thin materials with pulse echo ultrasound, multiple reflections (reverberations) from the layer(s) will overlap. It is therefore difficult to deduce information about speed of sound, thickness, density, etc. from the raw data. In order to extract this information, the overlapping pulses must be either decoupled or we must find some model of the material sample describing the wave propagation. It is, however, often reasonable to assume that the the number of reflections is small relative to the number of samples in the record signal of interest. In other words, the system describing the reverberations is sparse. In this paper we investigate, with simulations and with experiments on a 4.8 and 2.2 mm thick glass plate, respectively, how the framework of compressed sensing can be adopted in order to retrieve the impulse response of the material specimen

Place, publisher, year, edition, pages
IEEE Computer Society, 2017
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
Keywords
Glass, Ultrasonic imaging, Compressed sensing, Reverberation, Transducers, Shape, Ultrasonic variables measurement
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-67246 (URN)10.1109/ULTSYM.2017.8091788 (DOI)000416948400102 ()2-s2.0-85039445752 (Scopus ID)978-1-5386-3383-0 (ISBN)978-1-5386-3384-7 (ISBN)
Conference
2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-12-06Bibliographically approved
Carlson, J. E., Ovacikli, A. K. & Pääjärvi, P. (2017). Material Impulse Response Estimation from Overlapping Ultrasound Echoes Using a Compressed Sensing Technique. In: IEEE International Ultrasonics Symposium, IUS: . Paper presented at 2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017. IEEE Computer Society, Article ID 8092248.
Open this publication in new window or tab >>Material Impulse Response Estimation from Overlapping Ultrasound Echoes Using a Compressed Sensing Technique
2017 (English)In: IEEE International Ultrasonics Symposium, IUS, IEEE Computer Society, 2017, article id 8092248Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

In ultrasound examination of thin multi-layered materials, the received signal is, in both through-transmission and pulse-echo configurations, a superposition of multiple reflections from inside the sample. If the layer thicknesses are small compared to the duration of the emitted ultrasound pulse, the received signal will be a sum of overlapping ultrasound pulses. In such scenarios, estimation of the layer thicknesses is challenging. Previous work has adopted model-based decomposition of the overlapping echoes, or various pulse compression or deconvolution schemes, in order to better reveal the arrival times of each individual echo.

Place, publisher, year, edition, pages
IEEE Computer Society, 2017
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-64966 (URN)10.1109/ULTSYM.2017.8092248 (DOI)2-s2.0-85039420470 (Scopus ID)978-1-5386-3383-0 (ISBN)978-1-5386-3384-7 (ISBN)
Conference
2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017
Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2018-12-06Bibliographically approved
Carlson, J., van de Beek, J. & Mohamad, M. (2017). Mbit/second Communication through a Rock Bolt Using Ultrasound. In: : . Paper presented at 2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017. Piscataway, NJ: IEEE, Article ID 8092454.
Open this publication in new window or tab >>Mbit/second Communication through a Rock Bolt Using Ultrasound
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

In most industrial processes transfer of data and software from or to sensors is an essential part of the monitoring and control systems. Many of the older, wired communication systems have been or are being replaced with wireless alternatives. A number of challenges are associated with this replacement: Radio receivers are subject to interference from other radio sources. Similarly, radio transmitters may cause undesired interference into other equipment and environments. Compared to wired solutions, security becomes an issue as radio communication links are more vulnerable to eavesdropping than wired schemes. Radio communication with sensors and sensor platforms embedded deep inside large metal structures or fluid tanks may be difficult or even impossible. The objective of this work is to develop and evaluate a high data-rate communications scheme based on ultrasound, which can be used to transmit wirelessly through solid structures. An example will be given using a one-meter segment of a rock bolt.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE, 2017
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
Keywords
Ultrasonic imaging, Rocks, Fasteners, Sensors, Radio communication, Interference, Channel estimation
National Category
Signal Processing Telecommunications
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-66541 (URN)10.1109/ULTSYM.2017.8092454 (DOI)2-s2.0-85039419149 (Scopus ID)978-1-5386-3383-0 (ISBN)
Conference
2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017
Available from: 2017-11-10 Created: 2017-11-10 Last updated: 2018-12-07Bibliographically approved
Carlson, J., van de Beek, J. & Mohamad, M. (2017). Mbit/second Communication through a Rock Bolt Using Ultrasound. In: IEEE International Ultrasonics Symposium, IUS: . Paper presented at 2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017. Piscataway, NJ: IEEE Computer Society, Article ID 8092474.
Open this publication in new window or tab >>Mbit/second Communication through a Rock Bolt Using Ultrasound
2017 (English)In: IEEE International Ultrasonics Symposium, IUS, Piscataway, NJ: IEEE Computer Society, 2017, article id 8092474Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a digital communication system based on Orthogonal Frequency Division Multiplexing (OFDM) and MHz-range ultrasound, for transmission of data through solid materials and liquids. The system is tested on experiments using a off-the-shelf ultrasound transducers with a center frequency of 3.5 MHz as transmitter and receiver, respectively. The propagation medium in the experiment was a 1 m long section of an epoxy coated steel rock bolt. The results show that data rates in excess of 1 Mbit/second is attainable, using readily available hardware and software.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Computer Society, 2017
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
National Category
Signal Processing Telecommunications
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-65477 (URN)10.1109/ULTSYM.2017.8092474 (DOI)000416948402010 ()978-1-5386-3383-0 (ISBN)978-1-5386-3384-7 (ISBN)
Conference
2017 IEEE International Ultrasonics Symposium (IUS), Washington D.C., 6-9 Sept. 2017
Available from: 2017-09-04 Created: 2017-09-04 Last updated: 2018-12-07Bibliographically approved
Sand, A., Stener, J., Toivakka, M., Carlson, J. & Pålsson, B. (2016). A Stokesian Dynamics Approach for Simulation of Magnetic Particle Suspensions (ed.). Paper presented at Computational Modelling '15 : 08/06/2015 - 10/06/2015. Minerals Engineering, 90(SI ), 70-76
Open this publication in new window or tab >>A Stokesian Dynamics Approach for Simulation of Magnetic Particle Suspensions
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2016 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 90, no SI , p. 70-76Article in journal (Refereed) Published
Abstract [en]

The dynamic behaviour of μm-scale ferromagnetic particles in suspension is of interest for various mineral beneficiation processes. It is, however, difficult to experimentally study such processes at the particle-level. In these instances it can be advantageous to resort to suitable particle simulation methods.Stokesian dynamics is a mesh-free numerical technique developed for suspensions of nm to mm size particles. The method inherently considers hydrodynamic interactions, but additional interaction models can be included depending on the system under investigation. We here present a Stokesian dynamics (SD) implementation, which allows for simulation of the motion of suspended magnetic particles in presence of an external magnetic field. The magnetic interaction model includes particle-field interactions as well as pairwise interactions between magnetised particles.Simulations are compared with experiments using a laboratory-scale flow cell. The method is shown to be realistic for studying ferromagnetic suspensions in mineral processing applications, and can be useful in understanding and predicting the efficiency of mineral separation processes.

National Category
Metallurgy and Metallic Materials Signal Processing
Research subject
Mineral Processing; Signal Processing
Identifiers
urn:nbn:se:ltu:diva-27464 (URN)10.1016/j.mineng.2015.10.015 (DOI)000375169200007 ()2-s2.0-84960865330 (Scopus ID)0eda3225-823b-4369-91a2-78b07835122b (Local ID)0eda3225-823b-4369-91a2-78b07835122b (Archive number)0eda3225-823b-4369-91a2-78b07835122b (OAI)
Conference
Computational Modelling '15 : 08/06/2015 - 10/06/2015
Note
Validerad; 2016; Nivå 1; 20151102 (andbra); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6216-6132

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