The Experts below are selected from a list of 49899 Experts worldwide ranked by ideXlab platform
Jong H. Chow - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric Acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at Acoustic Frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to range gate Acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m range-gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent Acoustic measurements.
Ya Zhang - One of the best experts on this subject based on the ideXlab platform.
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Multi-target CW interferometric Acoustic measurements on a single optical beam
'The Optical Society', 2020Co-Authors: Ya Zhang, Bandutunga Chathura, Gray, Malcolm B, Chow JongAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at Acoustic Frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to range gate Acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m range-gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent Acoustic measurements.Australian Government Research Training Program (RTP) Scholarshi
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Multi-target CW interferometric Acoustic measurements on a single optical beam
Optics Express, 2019Co-Authors: Ya Zhang, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. ChowAbstract:We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at Acoustic Frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferometry to range gate Acoustic signals simultaneously from multiple in-line reflections while isolating coherent cross-talk between them. We demonstrate sub-nanometer displacement sensitivity across the audio band for each individual reflection surface and 1.2 m resolution between successive surfaces. Signals outside the 1.2 m range-gate of the system were suppressed by greater than 30 dB in amplitude, enabling high fidelity independent Acoustic measurements.
Raheb Bagherpour - One of the best experts on this subject based on the ideXlab platform.
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Investigating an innovative model for dimensional sedimentary rocks characterization using Acoustic Frequencies analysis during drilling
Rudarsko-geološko-naftni zbornik, 2018Co-Authors: M. Yari, Raheb BagherpourAbstract:Determining geomechanical characteristics of rocks plays a significant role in all consequent designing stages of geosciences. On the other hand, drilling is one of the considerable operations in primer phases of extracting rocks. Drilling process produces Acoustic signals as by-product during drilling. Then, one possible way for predicting geomechanical properties of rocks, is employing Acoustic signal Frequencies which are produced during drilling operation. This process helps to geoengineers for determining rock characteristics in short time and by low-cost and satisfying precision. This research tries to develop a novel computational relations between geomechanical characteristics of sedimentary rocks and produced dominant Acoustic Frequencies by implementing Fast Fourier Transform (FFT). For this purpose, a novel rotary drilling machine is developed by researchers. In order to introducing reliable model, 10 diverse sedimentary rock samples from various sedimentary basins of Iran are gathered in wide range of geomechanical features, and all tests are carried out on them. The results of this research could be used for sedimentary basins' characterization. Results show there are reliable mathematical relations between various characteristics of sedimentary rocks (UCS, TS, porosity and hardness) and diverse dominant Frequencies.
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Implementing Acoustic Frequency Analysis for Development the Novel Model of Determining Geomechanical Features of Igneous Rocks Using Rotary Drilling Device
Geotechnical and Geological Engineering, 2017Co-Authors: M. Yari, Raheb BagherpourAbstract:The drilling process is one of the significant stages of rock mechanic and mining engineering. Monitoring this operation can help researchers to have accurate perspective about drilling process, physical and mechanical features of rocks and drill bit characteristics. Drilling operation generates Acoustic signals as an unwanted byproduct, which could be helpful for analyzing the nature of this process. Determining the features of rock has an undeniable importance in all downstream steps of designation in mining projects. Definition of rock properties by using direct measurement tests is a time-consuming and costly process and requires high precision. Development a novel frequency based method in this research, for determining physical and rock-mechanical features of rock could be helpful for solving problems of time consumption, cost, and precision. None of the direct and indirect conventional methods is able, to provide an accessible and efficient way (in the viewpoint of cost, time consumption, and precision) for accelerating this process. This study attempts to present mathematical relations between rock mass features and dominant Acoustic Frequencies emitted during drilling process using Fast Fourier Transform (FFT). A novel rotary drilling machine, with the ability to record Acoustic Frequencies, is designed and constructed by investigators for providing this goal. All influencing parameters of drilling regime (vertical thrust force, drill bit rotational speed, diameter and material of drill bit, sound recording ability etc.) are manageable using this machine. For drilling tests and determining physical and rock mechanical characteristics, 11 volcanic rock samples are gathered in a wide range of features. After drilling tests and by analyzing Acoustic signals, five dominant Frequencies are extracted for each sample. Results demonstrate almost all physical–mechanical properties of volcanic rocks (uniaxial compressive strength, tensile strength, S and P-wave velocity, porosity percentage and Schmidt Rebound Number) are predictable using diverse dominant Frequencies of Acoustic signals. Overall, the results present novel linear models, which are able to predict rock features.
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Developing a novel model for predicting geomechanical features of carbonate rocks based on Acoustic frequency processing during drilling
Bulletin of Engineering Geology and the Environment, 2017Co-Authors: M. Yari, Raheb Bagherpour, Mehrbod KhoshoueiAbstract:The drilling operation is one of the significant phases in geosciences. Analyzing this function assists investigators to determine the correct standpoint on the drilling process itself. The drilling operation generates Acoustic Frequencies as a beneficial derivative output, which could facilitate achieving this standpoint. On the other hand, determining the properties of rocks plays a critical role in all downstream stages of the operation. Determining rock characteristics using direct geomechanical methods is time-consuming and expensive, and requires excessive accuracy. The dvelopment a frequency-based technique for predicting the geomechanical functions of rocks would solve these problems. Here, we discuss the logical relations between rock characterization and the first five dominant Acoustic Frequencies of the drilling operation, as determined by first recording and then analyzing the Frequencies of the Acoustic signals generated during the drilling operation, using Fast Fourier Transform. For providing a comparable condition, we developed a novel rotary drilling device. Eight carbonate rock samples were collected that covered a wide range of geomechanical features and used in the geomechanical and drilling tests. The results show there are reliable mathematical relations between various characteristics of carbonate rock samples (uniaxial compressive strength, tensile strength, S-wave and P-wave velocity, hardness) and diverse dominant Frequencies of the drilling Acoustic signals.
Timothy K. Stanton - One of the best experts on this subject based on the ideXlab platform.
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On Acoustic scattering by a shell-covered seafloor
Journal of the Acoustical Society of America, 2000Co-Authors: Timothy K. StantonAbstract:Acoustic scattering by the seafloor is sometimes influenced, if not dominated, by the presence of discrete volumetric objects such as shells. A series of measurements of target strength of a type of benthic shelled animal and associated scattering modeling have recently been completed (Stanton et al., “Acoustic scattering by benthic and planktonic shelled animals,” J. Acoust. Soc. Am., this issue). The results of that study are used herein to estimate the scattering by the seafloor with a covering of shells at high Acoustic Frequencies. A simple formulation is derived that expresses the area scattering strength of the seafloor in terms of the average reduced target strength or material properties of the discrete scatterers and their packing factor (where the reduced target strength is the target strength normalized by the geometric cross section of the scatterers and the averaging is done over orientation and/or a narrow range of size or frequency). The formula shows that, to first order, the backscatteri...
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Acoustic classification of a shell‐covered seafloor
Journal of the Acoustical Society of America, 1999Co-Authors: Timothy K. StantonAbstract:Acoustic scattering by the seafloor is sometimes influenced, if not dominated, by the presence of discrete volumetric objects such as shells. Classification of a shell‐covered seafloor requires understanding of the Acoustic scattering properties of the shells. A series of measurements of target strength of a type of benthic shelled animal and associated scattering modeling have recently been completed. In addition, a simple formula has been derived that expresses the area scattering strength of the seafloor in terms of the reduced target strength (RTS) of the discrete scatterers and their packing factor (where RTS is the target strength normalized by the size of the scatterers). The formula shows that, to first order, the backscattering at high Acoustic Frequencies by a dense layer of shells (or other discrete bodies such as rocks) depends principally upon material properties of the objects and packing factor, and is independent of size and Acoustic frequency. There are reasonable comparisons between scattering data from shell‐covered sections of seafloor and predictions using this formula and the measurements/modeling of shell target strength. The functional dependence of this and other seafloor scattering formulas upon shell and shell‐bed characteristics are discussed to assess one’s ability to classify a shell‐covered seafloor. [Work supported by ONR.]
M. Yari - One of the best experts on this subject based on the ideXlab platform.
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Investigating an innovative model for dimensional sedimentary rocks characterization using Acoustic Frequencies analysis during drilling
Rudarsko-geološko-naftni zbornik, 2018Co-Authors: M. Yari, Raheb BagherpourAbstract:Determining geomechanical characteristics of rocks plays a significant role in all consequent designing stages of geosciences. On the other hand, drilling is one of the considerable operations in primer phases of extracting rocks. Drilling process produces Acoustic signals as by-product during drilling. Then, one possible way for predicting geomechanical properties of rocks, is employing Acoustic signal Frequencies which are produced during drilling operation. This process helps to geoengineers for determining rock characteristics in short time and by low-cost and satisfying precision. This research tries to develop a novel computational relations between geomechanical characteristics of sedimentary rocks and produced dominant Acoustic Frequencies by implementing Fast Fourier Transform (FFT). For this purpose, a novel rotary drilling machine is developed by researchers. In order to introducing reliable model, 10 diverse sedimentary rock samples from various sedimentary basins of Iran are gathered in wide range of geomechanical features, and all tests are carried out on them. The results of this research could be used for sedimentary basins' characterization. Results show there are reliable mathematical relations between various characteristics of sedimentary rocks (UCS, TS, porosity and hardness) and diverse dominant Frequencies.
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Implementing Acoustic Frequency Analysis for Development the Novel Model of Determining Geomechanical Features of Igneous Rocks Using Rotary Drilling Device
Geotechnical and Geological Engineering, 2017Co-Authors: M. Yari, Raheb BagherpourAbstract:The drilling process is one of the significant stages of rock mechanic and mining engineering. Monitoring this operation can help researchers to have accurate perspective about drilling process, physical and mechanical features of rocks and drill bit characteristics. Drilling operation generates Acoustic signals as an unwanted byproduct, which could be helpful for analyzing the nature of this process. Determining the features of rock has an undeniable importance in all downstream steps of designation in mining projects. Definition of rock properties by using direct measurement tests is a time-consuming and costly process and requires high precision. Development a novel frequency based method in this research, for determining physical and rock-mechanical features of rock could be helpful for solving problems of time consumption, cost, and precision. None of the direct and indirect conventional methods is able, to provide an accessible and efficient way (in the viewpoint of cost, time consumption, and precision) for accelerating this process. This study attempts to present mathematical relations between rock mass features and dominant Acoustic Frequencies emitted during drilling process using Fast Fourier Transform (FFT). A novel rotary drilling machine, with the ability to record Acoustic Frequencies, is designed and constructed by investigators for providing this goal. All influencing parameters of drilling regime (vertical thrust force, drill bit rotational speed, diameter and material of drill bit, sound recording ability etc.) are manageable using this machine. For drilling tests and determining physical and rock mechanical characteristics, 11 volcanic rock samples are gathered in a wide range of features. After drilling tests and by analyzing Acoustic signals, five dominant Frequencies are extracted for each sample. Results demonstrate almost all physical–mechanical properties of volcanic rocks (uniaxial compressive strength, tensile strength, S and P-wave velocity, porosity percentage and Schmidt Rebound Number) are predictable using diverse dominant Frequencies of Acoustic signals. Overall, the results present novel linear models, which are able to predict rock features.
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Developing a novel model for predicting geomechanical features of carbonate rocks based on Acoustic frequency processing during drilling
Bulletin of Engineering Geology and the Environment, 2017Co-Authors: M. Yari, Raheb Bagherpour, Mehrbod KhoshoueiAbstract:The drilling operation is one of the significant phases in geosciences. Analyzing this function assists investigators to determine the correct standpoint on the drilling process itself. The drilling operation generates Acoustic Frequencies as a beneficial derivative output, which could facilitate achieving this standpoint. On the other hand, determining the properties of rocks plays a critical role in all downstream stages of the operation. Determining rock characteristics using direct geomechanical methods is time-consuming and expensive, and requires excessive accuracy. The dvelopment a frequency-based technique for predicting the geomechanical functions of rocks would solve these problems. Here, we discuss the logical relations between rock characterization and the first five dominant Acoustic Frequencies of the drilling operation, as determined by first recording and then analyzing the Frequencies of the Acoustic signals generated during the drilling operation, using Fast Fourier Transform. For providing a comparable condition, we developed a novel rotary drilling device. Eight carbonate rock samples were collected that covered a wide range of geomechanical features and used in the geomechanical and drilling tests. The results show there are reliable mathematical relations between various characteristics of carbonate rock samples (uniaxial compressive strength, tensile strength, S-wave and P-wave velocity, hardness) and diverse dominant Frequencies of the drilling Acoustic signals.
