The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Gerald C Lauchle - One of the best experts on this subject based on the ideXlab platform.
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development of an accelerometer based underwater Acoustic Intensity sensor
Journal of the Acoustical Society of America, 2004Co-Authors: Thomas B Gabrielson, Gerald C LauchleAbstract:An underwater Acoustic Intensity sensor is described. This sensor derives Acoustic Intensity from simultaneous, co-located measurement of the Acoustic pressure and one component of the Acoustic particle acceleration vector. The sensor consists of a pressure transducer in the form of a hollow piezoceramic cylinder and a pair of miniature accelerometers mounted inside the cylinder. Since this sensor derives Acoustic Intensity from measurement of Acoustic pressure and Acoustic particle acceleration, it is called a p-a Intensity probe. The sensor is ballasted to be nearly neutrally buoyant. It is desirable for the accelerometers to measure only the rigid body motion of the assembled probe and for the effective centers of the pressure sensor and accelerometer to be coincident. This is achieved by symmetric disposition of a pair of accelerometers inside the ceramic cylinder. The response of the Intensity probe is determined by comparison with a reference hydrophone in a predominantly reactive Acoustic field.
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Acoustic Intensity in the interaction region of a parametric source
Journal of the Acoustical Society of America, 2003Co-Authors: Gerald C Lauchle, Thomas B Gabrielson, N. F. Kottke, James A McconnellAbstract:The goal of this project was to measure Acoustic Intensity in the strong interaction region of a parametric source in order to obtain a clear definition of the source‐generation region and to separate the local generation (the reactive field) from propagation (the real or active field). The Acoustic Intensity vector was mapped in the interaction region of a parametric projector at Lake Seneca. The source was driven with primary signals at 22 kHz and 27 kHz. Receiving sensors were located 8.5 meters from the projector. At that range, the secondary at 5 kHz was between 40 and 45 dB below either primary. For the primary levels used, the plane‐wave shock inception distance would have been at least 14 meters. Furthermore, the Rayleigh distance for the projector was about 4 meters so the measurements at 8.5 meters were in the strong interaction region but not in saturation. Absorption was negligible over these ranges. The Intensity measurements were made at fixed range but varying azimuth angle and varying dept...
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development of a velocity gradient underwater Acoustic Intensity sensor
Journal of the Acoustical Society of America, 1999Co-Authors: Kevin J Bastyr, Gerald C Lauchle, James A McconnellAbstract:A neutrally buoyant, underwater Acoustic Intensity probe is constructed and tested. This sensor measures the Acoustic particle velocity at two closely spaced locations, hence it is denoted a “u-u” Intensity probe. A new theoretical derivation infers the Acoustic pressure from this one-dimensional velocity gradient, permitting the computation of one component of Acoustic Intensity. A calibration device, which produces a planar standing-wave field, is constructed and tested. In this calibrator, the performance of the u-u Intensity probe compares favorably to that of an Acoustic Intensity probe which measures both pressure and velocity directly.
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Pressure‐particle acceleration underwater Acoustic Intensity sensor
Journal of the Acoustical Society of America, 1999Co-Authors: Gerald C Lauchle, Thomas B. GabielsonAbstract:An underwater Acoustic Intensity sensor designed to measure one component of the Acoustic Intensity vector is discussed and evaluated experimentally. This sensor consists of a pressure transducer in the form of a piezoceramic hollow cylinder, and an accelerometer mounted inside of the cylinder. This is a pressure–Acoustic particle acceleration type of Intensity probe, and is henceforth denoted as a ‘‘p‐u‐dot Intensity probe.’’ The probe body has syntactic foam endcaps that are adjusted in thickness to allow the entire assembly to be neutrally buoyant. It is coated with polyurethane for waterproofing while maintaining Acoustical transparency in water. Each of the two transducers making up the Intensity sensor is calibrated individually in both air and water. The integrated Intensity probe is calibrated in a water‐filled plane‐wave tube. It is shown that this neutrally buoyant underwater Acoustic p‐u‐dot probe measures one component of sound Intensity that is in very close agreement to the predicted value u...
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underwater Acoustic Intensity probe
Journal of the Acoustical Society of America, 1996Co-Authors: Thomas B Gabrielson, James F Mceachern, Gerald C LauchleAbstract:An underwater probe for determining true Acoustic Intensity by the direct asurement of true Acoustic velocity and true Acoustic pressure in a neutrally buoyant package, utilizes a moving-coil geophone embedded in a casting of syntactic foam and a pair of hydrophones on the exterior of the casting.
Takashi Ushida - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental measurement of Acoustic Intensity on sonication parameters and decellularization using sonication treatment
Journal of Signal Processing, 2015Co-Authors: Nurul Syazwani, Takashi Ushida, Mohammad Shafiq, Azran AzhimAbstract:A novel sonication decellularization system is developed to prepare complete decellularized tissue. The objective of the study is to determine the influence of Acoustic Intensity on sonication parameter and decellularization using sonication treatment. The distribution of Acoustic Intensity for sonication treatment is first demonstrated by simulation followed by experimental measurement. The relation of Acoustic Intensity with sonication parameter on decellularization is further investigated. The effect of Acoustic Intensity on decellularization is evaluated by measuring the residual cell in tissue sample using Hematoxylin-Eosin staining. The simulation shows low residual cells upon high Acoustic Intensity. From the result, Acoustic Intensity shows positive correlation with dissolved oxygen concentration and pH and negative correlation with conductivity. The present study concludes that decellularization performed by sonication treatment is dependent on Acoustic Intensity.
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the impact of Acoustic Intensity on solution parameters and decellularization using sonication treatment
Journal of Biomaterials and Tissue Engineering, 2015Co-Authors: Azran Azhim, Mohammad Shafiq, Rahman A Rasyada, Katsuko Furukawa, Takashi UshidaAbstract:A combination method using sonication and chemical treatment to decellularize tissue sample is described. The objective of the study is to determine the Acoustic Intensity and solution parameters modulating decellularization process. The Acoustic Intensity distribution of sonication system was first demonstrated by simulation and followed by experimental measurement. The effect of Acoustic Intensity with solution parameters including dissolved oxygen (DO) concentration, pH, and conductivity was observed using 170 kHz system. From both simulation and experimental results, it is demonstrated that Acoustic Intensity effects were localised as high cell removal recorded at the center of irradiation. Furthermore, our study demonstrated strong correlation between Acoustic Intensity with solution parameters. The study indicates positive correlation of DO concentration and pH of SDS detergent with Acoustic Intensity and negative correlation between conductivity and Acoustic Intensity. The results further supported by the complete removal of DNA with preservation of extracellular matrix (ECM), collagen and elastin content. In conclusion, the effect of Acoustic Intensity is localised and influenced decellularization. Our study also indicates strong correlation between Acoustic Intensity and solution parameters as we suggested the formation of cavitation bubble derived the decellularization process.
Azran Azhim - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental measurement of Acoustic Intensity on sonication parameters and decellularization using sonication treatment
Journal of Signal Processing, 2015Co-Authors: Nurul Syazwani, Takashi Ushida, Mohammad Shafiq, Azran AzhimAbstract:A novel sonication decellularization system is developed to prepare complete decellularized tissue. The objective of the study is to determine the influence of Acoustic Intensity on sonication parameter and decellularization using sonication treatment. The distribution of Acoustic Intensity for sonication treatment is first demonstrated by simulation followed by experimental measurement. The relation of Acoustic Intensity with sonication parameter on decellularization is further investigated. The effect of Acoustic Intensity on decellularization is evaluated by measuring the residual cell in tissue sample using Hematoxylin-Eosin staining. The simulation shows low residual cells upon high Acoustic Intensity. From the result, Acoustic Intensity shows positive correlation with dissolved oxygen concentration and pH and negative correlation with conductivity. The present study concludes that decellularization performed by sonication treatment is dependent on Acoustic Intensity.
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the impact of Acoustic Intensity on solution parameters and decellularization using sonication treatment
Journal of Biomaterials and Tissue Engineering, 2015Co-Authors: Azran Azhim, Mohammad Shafiq, Rahman A Rasyada, Katsuko Furukawa, Takashi UshidaAbstract:A combination method using sonication and chemical treatment to decellularize tissue sample is described. The objective of the study is to determine the Acoustic Intensity and solution parameters modulating decellularization process. The Acoustic Intensity distribution of sonication system was first demonstrated by simulation and followed by experimental measurement. The effect of Acoustic Intensity with solution parameters including dissolved oxygen (DO) concentration, pH, and conductivity was observed using 170 kHz system. From both simulation and experimental results, it is demonstrated that Acoustic Intensity effects were localised as high cell removal recorded at the center of irradiation. Furthermore, our study demonstrated strong correlation between Acoustic Intensity with solution parameters. The study indicates positive correlation of DO concentration and pH of SDS detergent with Acoustic Intensity and negative correlation between conductivity and Acoustic Intensity. The results further supported by the complete removal of DNA with preservation of extracellular matrix (ECM), collagen and elastin content. In conclusion, the effect of Acoustic Intensity is localised and influenced decellularization. Our study also indicates strong correlation between Acoustic Intensity and solution parameters as we suggested the formation of cavitation bubble derived the decellularization process.
Hüseyin Hacıhabiboğlu - One of the best experts on this subject based on the ideXlab platform.
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Sound source localisation performance of open spherical Acoustic Intensity probes under reverberant conditions
2014 22nd Signal Processing and Communications Applications Conference (SIU), 2014Co-Authors: Hüseyin HacıhabiboğluAbstract:Open-spherical Acoustic Intensity probes are microphone arrays based on the Kirchhoff-Helmholtz integral and are used in the measurement of active Acoustic Intensity. The Acoustic Intensity measurements obtained by these arrays can be used to localise sound sources. Previously, the performance of these arrays in Acoustic free field conditions were obtained using numerical simulations and it was shown that they provide better performance than other types of probes. This paper discusses the implementation of open spherical microphone arrays and their performance in reverberant enclosures.
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SIU - Sound source localisation performance of open spherical Acoustic Intensity probes under reverberant conditions
2014 22nd Signal Processing and Communications Applications Conference (SIU), 2014Co-Authors: Hüseyin HacıhabiboğluAbstract:Open-spherical Acoustic Intensity probes are microphone arrays based on the Kirchhoff-Helmholtz integral and are used in the measurement of active Acoustic Intensity. The Acoustic Intensity measurements obtained by these arrays can be used to localise sound sources. Previously, the performance of these arrays in Acoustic free field conditions were obtained using numerical simulations and it was shown that they provide better performance than other types of probes. This paper discusses the implementation of open spherical microphone arrays and their performance in reverberant enclosures.
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Theoretical Analysis of Open Spherical Microphone Arrays for Acoustic Intensity Measurements
IEEE ACM Transactions on Audio Speech and Language Processing, 2014Co-Authors: Hüseyin HacıhabiboğluAbstract:Acoustic Intensity is a vectorial measure of Acoustic energy flow through a given region of interest. Three-dimensional measurement of Acoustic Intensity requires special microphone array configurations. This paper provides a theoretical analysis of open spherical microphone arrays for the 3-D measurement of Acoustic Intensity. The calculations of the pressure and the particle velocity components of the sound field inside a closed volume are expressed using the Kirchhoff-Helmholtz integral equation. The conditions which simplify the calculation are identified. This calculation is then constrained to a finite set of microphones positioned at prescribed points on an open sphere. Several open spherical array topologies are proposed. Their magnitude and directional errors and measurement bandwidths are investigated via numerical simulations. A comparison with conventional open-sphere 3-D Intensity probes is presented.
Mohammad Shafiq - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental measurement of Acoustic Intensity on sonication parameters and decellularization using sonication treatment
Journal of Signal Processing, 2015Co-Authors: Nurul Syazwani, Takashi Ushida, Mohammad Shafiq, Azran AzhimAbstract:A novel sonication decellularization system is developed to prepare complete decellularized tissue. The objective of the study is to determine the influence of Acoustic Intensity on sonication parameter and decellularization using sonication treatment. The distribution of Acoustic Intensity for sonication treatment is first demonstrated by simulation followed by experimental measurement. The relation of Acoustic Intensity with sonication parameter on decellularization is further investigated. The effect of Acoustic Intensity on decellularization is evaluated by measuring the residual cell in tissue sample using Hematoxylin-Eosin staining. The simulation shows low residual cells upon high Acoustic Intensity. From the result, Acoustic Intensity shows positive correlation with dissolved oxygen concentration and pH and negative correlation with conductivity. The present study concludes that decellularization performed by sonication treatment is dependent on Acoustic Intensity.
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the impact of Acoustic Intensity on solution parameters and decellularization using sonication treatment
Journal of Biomaterials and Tissue Engineering, 2015Co-Authors: Azran Azhim, Mohammad Shafiq, Rahman A Rasyada, Katsuko Furukawa, Takashi UshidaAbstract:A combination method using sonication and chemical treatment to decellularize tissue sample is described. The objective of the study is to determine the Acoustic Intensity and solution parameters modulating decellularization process. The Acoustic Intensity distribution of sonication system was first demonstrated by simulation and followed by experimental measurement. The effect of Acoustic Intensity with solution parameters including dissolved oxygen (DO) concentration, pH, and conductivity was observed using 170 kHz system. From both simulation and experimental results, it is demonstrated that Acoustic Intensity effects were localised as high cell removal recorded at the center of irradiation. Furthermore, our study demonstrated strong correlation between Acoustic Intensity with solution parameters. The study indicates positive correlation of DO concentration and pH of SDS detergent with Acoustic Intensity and negative correlation between conductivity and Acoustic Intensity. The results further supported by the complete removal of DNA with preservation of extracellular matrix (ECM), collagen and elastin content. In conclusion, the effect of Acoustic Intensity is localised and influenced decellularization. Our study also indicates strong correlation between Acoustic Intensity and solution parameters as we suggested the formation of cavitation bubble derived the decellularization process.
