An underwater remotely operated vehicle (ROV) was developed to allow inspection process without the need for human divers to enter the water. The ROV has a video camera, a Doppler navigation sonar and gyroscope-based orientation sensor. Each image of the underwater scene is saved along with the video camera's instantaneous position and orientation. The images are then patched together into a large composite picture of the structure. The method, which is based on the maximum a posteriori estimation technique, combines the least-mean-squared-error estimator and Kalman Filter. It provides smooth and robust image shift estimation. This method has been tested and shown as a practical and potentially useful underwater inspection tool.
{"title":"Underwater image mosaicing using maximum a posteriori image registration","authors":"J. Guo, S. Cheng, J.Y. Yinn","doi":"10.1109/UT.2000.852577","DOIUrl":"https://doi.org/10.1109/UT.2000.852577","url":null,"abstract":"An underwater remotely operated vehicle (ROV) was developed to allow inspection process without the need for human divers to enter the water. The ROV has a video camera, a Doppler navigation sonar and gyroscope-based orientation sensor. Each image of the underwater scene is saved along with the video camera's instantaneous position and orientation. The images are then patched together into a large composite picture of the structure. The method, which is based on the maximum a posteriori estimation technique, combines the least-mean-squared-error estimator and Kalman Filter. It provides smooth and robust image shift estimation. This method has been tested and shown as a practical and potentially useful underwater inspection tool.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131769484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sheng-Chung Lo, Chieh-Cheng Yen, Kuang-Nan Huang, L. Chien
The Penghu undersea archeology project has been carried out since 1995 in the Penghu area, which used to be on the passage of the main business route from Mainland China to the Southeast Asia. This research project involves professionals and researchers from the fields of archaeology, oceanography, meteorology, engineering and diving. The discovery of the ancient shipwreck, Chiang-Chun 1/sup st/, and the antiques load is of important historical significance. The whole research project includes the archaeology, seafloor mapping, and divers excavating and information system. The paper discusses the project in terms of seafloor mapping and information system. The purpose of seafloor mapping is, by the use of sonar inspection, to seek and spot the possible targets and to help the divers identify the targets. The facilities include a global positioning system, an echo sounder, a side scan sonar, and a sub-bottom profiler. After an arduous investigation of 28 possible targets in a six-square kilometer area under rough sea status, three targets were identified to be Chiang-Chun 1/sup st/, an iron-shell-ship, and a ship-shaped reef. The Penghu undersea archeology project and the general information on the undersea archeology survey and salvage technology were introduced on a web site for an easy access. The structure and the method used to set up the web site are introduced. The contents of the web site include project history, project introduction and execution, undersea archeology technology, shipwreck excavation, perspective of undersea archeology, messages box, full contents search, and linkages to other underwater archeology sites.
澎湖海底考古项目自1995年开始在澎湖地区开展，该地区曾经是中国大陆到东南亚的主要商业路线的通道。这项研究项目涉及考古学、海洋学、气象学、工程学和潜水学等领域的专业人士和研究人员。此次发现的古沉船“江春1号”和古玩载具具有重要的历史意义。整个研究项目包括考古、海底测绘、潜水员挖掘和信息系统。本文从海底测绘与信息系统的角度对该项目进行了探讨。海底测绘的目的是利用声纳检查，寻找和发现可能的目标，并帮助潜水员识别目标。这些设施包括一个全球定位系统、一个回声测深仪、一个侧面扫描声纳和一个水下剖面仪。在波涛汹涌的海面下对6平方公里区域内的28个可能目标进行了艰苦的调查后，确定了三个目标是jiang - chun 1/sup /，一艘铁壳船和一艘船形礁。通过网站介绍了澎湖海底考古项目及海底考古调查打捞技术的概况。介绍了网站的结构和建立方法。网站内容包括项目历史、项目介绍与实施、海底考古技术、沉船发掘、海底考古视角、留言框、全文搜索、其他水下考古网站链接等。
{"title":"Seafloor mapping and information system in underwater archaeology exploration-The discovery of an ancient shipwreck in Penghu, Taiwan","authors":"Sheng-Chung Lo, Chieh-Cheng Yen, Kuang-Nan Huang, L. Chien","doi":"10.1109/UT.2000.852510","DOIUrl":"https://doi.org/10.1109/UT.2000.852510","url":null,"abstract":"The Penghu undersea archeology project has been carried out since 1995 in the Penghu area, which used to be on the passage of the main business route from Mainland China to the Southeast Asia. This research project involves professionals and researchers from the fields of archaeology, oceanography, meteorology, engineering and diving. The discovery of the ancient shipwreck, Chiang-Chun 1/sup st/, and the antiques load is of important historical significance. The whole research project includes the archaeology, seafloor mapping, and divers excavating and information system. The paper discusses the project in terms of seafloor mapping and information system. The purpose of seafloor mapping is, by the use of sonar inspection, to seek and spot the possible targets and to help the divers identify the targets. The facilities include a global positioning system, an echo sounder, a side scan sonar, and a sub-bottom profiler. After an arduous investigation of 28 possible targets in a six-square kilometer area under rough sea status, three targets were identified to be Chiang-Chun 1/sup st/, an iron-shell-ship, and a ship-shaped reef. The Penghu undersea archeology project and the general information on the undersea archeology survey and salvage technology were introduced on a web site for an easy access. The structure and the method used to set up the web site are introduced. The contents of the web site include project history, project introduction and execution, undersea archeology technology, shipwreck excavation, perspective of undersea archeology, messages box, full contents search, and linkages to other underwater archeology sites.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"337 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Joseph, R. White, T. Bethge, J. Palshook, C. Ingram, B. Rumish
The Naval Oceanographic Office (NAVOCEANO) and Nauticos Corporation conducted a Seamap-C survey that delineated small regions of high reflectivity material in an abyssal plain northwest of Midway Atoll. The survey in the Midway area was based on a Nauticos Corporation RENAV/sup TM/ analysis of the possible location of the Japanese carrier, Kaga, sunk during the Battle of Midway in June, 1942. Seamap-C imaged three potential targets for further investigation with the higher frequency EG&G 960 system. A subsequent operation in the Midway area was conducted some months later using NAVOCEANO's Towed Oceanographic Survey System with higher resolution sidescan sonar (50/500 kHz), video cameras, and digital still photography. The optical survey identified a debris field, composed of twisted wreckage and the associated debris from one of the Japanese aircraft carriers sunk during the Battle of Midway.
{"title":"Using the NAVOCEANO wide swath sidescan sonar Seamap-C to locate and differentiate man-made objects from natural features on the seafloor","authors":"D. Joseph, R. White, T. Bethge, J. Palshook, C. Ingram, B. Rumish","doi":"10.1109/UT.2000.852512","DOIUrl":"https://doi.org/10.1109/UT.2000.852512","url":null,"abstract":"The Naval Oceanographic Office (NAVOCEANO) and Nauticos Corporation conducted a Seamap-C survey that delineated small regions of high reflectivity material in an abyssal plain northwest of Midway Atoll. The survey in the Midway area was based on a Nauticos Corporation RENAV/sup TM/ analysis of the possible location of the Japanese carrier, Kaga, sunk during the Battle of Midway in June, 1942. Seamap-C imaged three potential targets for further investigation with the higher frequency EG&G 960 system. A subsequent operation in the Midway area was conducted some months later using NAVOCEANO's Towed Oceanographic Survey System with higher resolution sidescan sonar (50/500 kHz), video cameras, and digital still photography. The optical survey identified a debris field, composed of twisted wreckage and the associated debris from one of the Japanese aircraft carriers sunk during the Battle of Midway.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115724705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Tsukioka, T. Aoki, K. Tamura, T. Murashima, H. Nakajoh, T. Ida
Japan Marine Science and Technology Center has been developing a long-range autonomous underwater vehicle (AUV) since 1998. This vehicle was named "AUV-EX1" and it is designed to have a capability of cruising up to 300 kilometers along a pre-programmed route. The body is a streamlined shape with a total length of 10 meters and its weight of 7.5 tons. For long range cruising, key technologies are energy source and navigation. Electric-energy is supplied from lithium ion rechargeable battery and it can be combined with a fuel cell. The navigation system is based on a high accuracy inertial navigation system. The vehicle is designed to gather scientific data by an on-board water sampler, side scan sonar and CTDO. This paper presents the overview of the AUV-EX1 and test plan in the future.
{"title":"Development of a long range autonomous underwater vehicle /spl Gt/OPEN\"/AUV-EX1\"","authors":"S. Tsukioka, T. Aoki, K. Tamura, T. Murashima, H. Nakajoh, T. Ida","doi":"10.1109/UT.2000.852553","DOIUrl":"https://doi.org/10.1109/UT.2000.852553","url":null,"abstract":"Japan Marine Science and Technology Center has been developing a long-range autonomous underwater vehicle (AUV) since 1998. This vehicle was named \"AUV-EX1\" and it is designed to have a capability of cruising up to 300 kilometers along a pre-programmed route. The body is a streamlined shape with a total length of 10 meters and its weight of 7.5 tons. For long range cruising, key technologies are energy source and navigation. Electric-energy is supplied from lithium ion rechargeable battery and it can be combined with a fuel cell. The navigation system is based on a high accuracy inertial navigation system. The vehicle is designed to gather scientific data by an on-board water sampler, side scan sonar and CTDO. This paper presents the overview of the AUV-EX1 and test plan in the future.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The float buoy ranging system consists of a vessel-mounted pinger, three surveying float buoys which receive the pinger signal and the receiving station on the testing ship. The antenna of the receiving station receives the radio signal for the underwater vehicle's position from three surveying float buoys. At the same time it receives the radio signals for three float buoy's position an the surface of the sea from four GPS satellites. The surveying float buoy processing system in the receiving station tracks down the running locus of the underwater vehicle as the X-Y co-ordinates from the values of the latitude and the longitude. Further, it is possible to carry out the float buoy ranging system's calibration to determine the float buoy position at any time.
{"title":"The study of the float buoy ranging system for the underwater vehicle","authors":"S. Kurano, T. Ishiwata, N. Konishi","doi":"10.1109/UT.2000.852534","DOIUrl":"https://doi.org/10.1109/UT.2000.852534","url":null,"abstract":"The float buoy ranging system consists of a vessel-mounted pinger, three surveying float buoys which receive the pinger signal and the receiving station on the testing ship. The antenna of the receiving station receives the radio signal for the underwater vehicle's position from three surveying float buoys. At the same time it receives the radio signals for three float buoy's position an the surface of the sea from four GPS satellites. The surveying float buoy processing system in the receiving station tracks down the running locus of the underwater vehicle as the X-Y co-ordinates from the values of the latitude and the longitude. Further, it is possible to carry out the float buoy ranging system's calibration to determine the float buoy position at any time.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130913633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Ohta, K. Ohkawa, K. Asano, S. Hibi, H. Takahashi
The interface wave is known as a useful tool to study geoacoustic properties and can be conventionally generated by setting up an explosive or a pneumatic source on/above the seafloor. This type of source, however, also excites strong compressional waves in the water and sediment, and so the generated interface wave is affected by this compressional wave, resulting in difficulty in processing. The waves generated in this way are also poor in duality and those sources may cause environmental problems. To solve this, we tried to utilize an electromagnetic induction source, called Boomer, which is generally used in the water as a source for generating compressional waves. First, we fabricated a Boomer with several types of vibrator plates on a small scale. To evaluate the performance of the source, the sound pressure level exited by the source was measured in a water tank and was compared with a designed one. Then we drove the source with the vibrator plates on the seafloor and evaluated the properties of the generated interface wave, which observed by a geophone, and compared the measured wave signal with one generated by dropping a weight. Consequently, the electromagnetic induction source turns out to be useful for generating an interface wave having repeatability.
{"title":"Generating interface wave using electromagnetic induction source","authors":"K. Ohta, K. Ohkawa, K. Asano, S. Hibi, H. Takahashi","doi":"10.1109/UT.2000.852517","DOIUrl":"https://doi.org/10.1109/UT.2000.852517","url":null,"abstract":"The interface wave is known as a useful tool to study geoacoustic properties and can be conventionally generated by setting up an explosive or a pneumatic source on/above the seafloor. This type of source, however, also excites strong compressional waves in the water and sediment, and so the generated interface wave is affected by this compressional wave, resulting in difficulty in processing. The waves generated in this way are also poor in duality and those sources may cause environmental problems. To solve this, we tried to utilize an electromagnetic induction source, called Boomer, which is generally used in the water as a source for generating compressional waves. First, we fabricated a Boomer with several types of vibrator plates on a small scale. To evaluate the performance of the source, the sound pressure level exited by the source was measured in a water tank and was compared with a designed one. Then we drove the source with the vibrator plates on the seafloor and evaluated the properties of the generated interface wave, which observed by a geophone, and compared the measured wave signal with one generated by dropping a weight. Consequently, the electromagnetic induction source turns out to be useful for generating an interface wave having repeatability.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125903235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G.P. Turmov, V. Korochentsev, E. Gorodetskaya, A. Mironenko, D.V. Kislitsin, O. Starodubtsev
The modes of the instant prognosis of earthquakes and tsunami with probability greater than 0.95 are offered. These modes are based on the principal idea of a simultaneous measurement of elastic and electromagnetic waves from the underground center of earthquakes. Electromagnetic waves with frequency from 1 Hz up to 1000 Hz transmit well on the surface of the Earth, bottom of ocean and in open space. The time of arrival of an electromagnetic wave at three (or more) points can be used to determine coordinates of the center of the earthquakes. The measurement of intensity of an electromagnetic signal is an informative indication about arrival of disastrous elastic waves. The mode of fall of energy of elastic waves in a seismic center is developed by an exposure to electromagnetic waves within 30-50 days in one year.
{"title":"Forecast of underwater earthquakes with a great degree of probability","authors":"G.P. Turmov, V. Korochentsev, E. Gorodetskaya, A. Mironenko, D.V. Kislitsin, O. Starodubtsev","doi":"10.1109/UT.2000.852525","DOIUrl":"https://doi.org/10.1109/UT.2000.852525","url":null,"abstract":"The modes of the instant prognosis of earthquakes and tsunami with probability greater than 0.95 are offered. These modes are based on the principal idea of a simultaneous measurement of elastic and electromagnetic waves from the underground center of earthquakes. Electromagnetic waves with frequency from 1 Hz up to 1000 Hz transmit well on the surface of the Earth, bottom of ocean and in open space. The time of arrival of an electromagnetic wave at three (or more) points can be used to determine coordinates of the center of the earthquakes. The measurement of intensity of an electromagnetic signal is an informative indication about arrival of disastrous elastic waves. The mode of fall of energy of elastic waves in a seismic center is developed by an exposure to electromagnetic waves within 30-50 days in one year.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121386855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article considers some practical and theoretical issues in the trade-off between globally consistent navigation and local precision manoeuvring. Precise local metrical maps are the common base for docking, manipulation, or other exact trajectory planning and control tasks. Yet these models are not scaling fine in the total geometrical size, when handling real world sensory data, and drifts. Nevertheless there is a need for a globally consistent spatial model for long term navigation. The presented work proposes a method of embedding local metric area patches in a topologically consistent global structure suitable for qualitative, and robust navigation. A global positioning information is not required at any stage, which limits the global precision of the spatial model, but on the other hand recommends it for environments where this information is not available. Results from physical experiments with autonomous robots are presented to demonstrate the robustness and practicality of the approach.
{"title":"Embedding local metrical map patches in a globally consistent topological map","authors":"Uwe R Zimmer","doi":"10.1109/UT.2000.852560","DOIUrl":"https://doi.org/10.1109/UT.2000.852560","url":null,"abstract":"This article considers some practical and theoretical issues in the trade-off between globally consistent navigation and local precision manoeuvring. Precise local metrical maps are the common base for docking, manipulation, or other exact trajectory planning and control tasks. Yet these models are not scaling fine in the total geometrical size, when handling real world sensory data, and drifts. Nevertheless there is a need for a globally consistent spatial model for long term navigation. The presented work proposes a method of embedding local metric area patches in a topologically consistent global structure suitable for qualitative, and robust navigation. A global positioning information is not required at any stage, which limits the global precision of the spatial model, but on the other hand recommends it for environments where this information is not available. Results from physical experiments with autonomous robots are presented to demonstrate the robustness and practicality of the approach.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132500257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the case of dredging of hard-packed sand, reduction of solid concentration and wear of cutter teeth of the dredge head, etc. can pose some problems, and moreover impact on the environment must be taken care of sufficiently. Model tests were performed to solve these problems using some improvements of a cutter suction dredger. It has become obvious that if a light soil-water mixture recycling system is used in combination with the improved type cutter head with anti-pollution cover, the loaded soil volume in the hopper is improved greatly, and that it is also possible to prevent pollution at the same time.
{"title":"Development of dredging method for hard-packed sand","authors":"H. Kato, Y. Sega, Y. Takei, T. Harada","doi":"10.1109/UT.2000.852599","DOIUrl":"https://doi.org/10.1109/UT.2000.852599","url":null,"abstract":"In the case of dredging of hard-packed sand, reduction of solid concentration and wear of cutter teeth of the dredge head, etc. can pose some problems, and moreover impact on the environment must be taken care of sufficiently. Model tests were performed to solve these problems using some improvements of a cutter suction dredger. It has become obvious that if a light soil-water mixture recycling system is used in combination with the improved type cutter head with anti-pollution cover, the loaded soil volume in the hopper is improved greatly, and that it is also possible to prevent pollution at the same time.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132539277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work deals with the application of an ultrasonic nondestructive technique to characterize poroelastic materials; the results of ultrasonic experiments in the laboratory are used to investigate the wave propagation models in a poroelastic medium filled with fluid. The laboratory precision is required to extract, from measurements, powerful parametric models describing the wave propagation by mean of a frequency-domain inversion technique. The ultrasonic equipment consists of a water immersion system using non-destructive testing-type transducers. In order to simulate the mechanical behavior of sediments, the device under investigation is a composite multilayer saturated with water. Immersion experiments are made at frequencies ranging from 0.3 to 3 MHz. The physical parameters of the used material are estimated and attention is paid to the evolution of the phase-velocity dispersion and the absorption over the frequency band.
{"title":"Ultrasonic waves propagation in fluid-saturated materials","authors":"A.B. Temsamani, S. Vandenplas, L. van Biesen","doi":"10.1109/UT.2000.852572","DOIUrl":"https://doi.org/10.1109/UT.2000.852572","url":null,"abstract":"This work deals with the application of an ultrasonic nondestructive technique to characterize poroelastic materials; the results of ultrasonic experiments in the laboratory are used to investigate the wave propagation models in a poroelastic medium filled with fluid. The laboratory precision is required to extract, from measurements, powerful parametric models describing the wave propagation by mean of a frequency-domain inversion technique. The ultrasonic equipment consists of a water immersion system using non-destructive testing-type transducers. In order to simulate the mechanical behavior of sediments, the device under investigation is a composite multilayer saturated with water. Immersion experiments are made at frequencies ranging from 0.3 to 3 MHz. The physical parameters of the used material are estimated and attention is paid to the evolution of the phase-velocity dispersion and the absorption over the frequency band.","PeriodicalId":397110,"journal":{"name":"Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132672937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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