Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441536
Bin Zhou, Yuxi Li, Dezhi Li, W. Lu, S. Shen, G. Fang, Yan Su, S. Dai
China's first Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar instrument has been selected to be a part of payload on the rover. The main scientific objective of the SPR is to characterize the thickness and sub-layer distribution of the Martian soil. The SPR consists of two channels. The low frequency channel of the SPR will provide a penetrating depth of 10 to 100 meters with a resolution of a few meters within the Martian soil. The higher frequency channel will penetrate to a depth of 3 to 10 meters with a resolution of a few centimeters within the Martian soil. The engineering model of the SPR was designed and manufactured. In order to illustrate and validate the equipment's performance, some laboratory field tests have been performed. The objectives of these tests were to evaluate the interaction between the radar and the rover and detect the internal objects buried in the pool filled with artificial volcanic ash.
{"title":"Initial Laboratory Field Tests of the Rover-mounted GPR for China's First Mission to Mars","authors":"Bin Zhou, Yuxi Li, Dezhi Li, W. Lu, S. Shen, G. Fang, Yan Su, S. Dai","doi":"10.1109/ICGPR.2018.8441536","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441536","url":null,"abstract":"China's first Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar instrument has been selected to be a part of payload on the rover. The main scientific objective of the SPR is to characterize the thickness and sub-layer distribution of the Martian soil. The SPR consists of two channels. The low frequency channel of the SPR will provide a penetrating depth of 10 to 100 meters with a resolution of a few meters within the Martian soil. The higher frequency channel will penetrate to a depth of 3 to 10 meters with a resolution of a few centimeters within the Martian soil. The engineering model of the SPR was designed and manufactured. In order to illustrate and validate the equipment's performance, some laboratory field tests have been performed. The objectives of these tests were to evaluate the interaction between the radar and the rover and detect the internal objects buried in the pool filled with artificial volcanic ash.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124012738","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441658
E. Huber, G. Hans
RGPR, the first ground-penetrating radar (GPR) data processing package written in the R language, is presented. R is a free and open-source high-level programming language for statistical computing. RGPR is built around two main classes to process and visualize GPR data as well as to keep track of the processing steps. Although RGPR is still a work in progress, many of the basic processing methods are already implemented. The package is hosted on GitHub for collaborative development and is easily expandable. Through its openness and the rich R environment, RGPR promotes reproducible GPR research as well as GPR processing learning.
{"title":"RGPR — An open-source package to process and visualize GPR data","authors":"E. Huber, G. Hans","doi":"10.1109/ICGPR.2018.8441658","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441658","url":null,"abstract":"RGPR, the first ground-penetrating radar (GPR) data processing package written in the R language, is presented. R is a free and open-source high-level programming language for statistical computing. RGPR is built around two main classes to process and visualize GPR data as well as to keep track of the processing steps. Although RGPR is still a work in progress, many of the basic processing methods are already implemented. The package is hosted on GitHub for collaborative development and is easily expandable. Through its openness and the rich R environment, RGPR promotes reproducible GPR research as well as GPR processing learning.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121298527","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441530
P. M. Barone
Roman Archaeology is one of the most popular archaeological disciplines in Europe. Roman archaeologists frequently have to deal with excavations within a context of a modern city. This means that they cannot always dig an area extensively and deeply, but they must interpret the archaeological records based on the partial evidences brought to the light. In this paper, Rome (Italy) will be the scenario of three surveys in which the Ground Penetrating Radar (GPR) technique has helped to better comprehend Roman archaeological sites that were considered acknowledged but still with some “secrets”.
{"title":"Roman Archaeology: The benefit of using GPR investigations","authors":"P. M. Barone","doi":"10.1109/ICGPR.2018.8441530","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441530","url":null,"abstract":"Roman Archaeology is one of the most popular archaeological disciplines in Europe. Roman archaeologists frequently have to deal with excavations within a context of a modern city. This means that they cannot always dig an area extensively and deeply, but they must interpret the archaeological records based on the partial evidences brought to the light. In this paper, Rome (Italy) will be the scenario of three surveys in which the Ground Penetrating Radar (GPR) technique has helped to better comprehend Roman archaeological sites that were considered acknowledged but still with some “secrets”.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121385447","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441656
Pak CW Kenneth, G. Ren, J. Li, W. Lai
This paper studies the feasibility of the Time Lapse GRP (TLGPR) to be a monitoring measures for deep excavation works. The TLGPR aims to quantify the difference between two radargram collected along boundary of construction site at different time. It provides an information on the degree of change, or even formation of void, in the soil mass being retained by lateral support. Non-signal processed data (256 samples per trace) were input to an in-house LabView programme for Wavelet Transform (WT) to determine the peak frequency of A-scan at particular time-depth. By comparing the differences in peak frequency at different time, changes in soil mass identified. Result shows that the TLGPR able to quantify the degree of change between two radargram. Moreover, due to the TLGPR is comparing the difference in frequency domain, it is capable to identify differences which are not visually notable from signal processed image.
{"title":"Feasibility Study of Time Lapse Ground Penetrating Radar as Monitoring Measures for Deep Excavation Works","authors":"Pak CW Kenneth, G. Ren, J. Li, W. Lai","doi":"10.1109/ICGPR.2018.8441656","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441656","url":null,"abstract":"This paper studies the feasibility of the Time Lapse GRP (TLGPR) to be a monitoring measures for deep excavation works. The TLGPR aims to quantify the difference between two radargram collected along boundary of construction site at different time. It provides an information on the degree of change, or even formation of void, in the soil mass being retained by lateral support. Non-signal processed data (256 samples per trace) were input to an in-house LabView programme for Wavelet Transform (WT) to determine the peak frequency of A-scan at particular time-depth. By comparing the differences in peak frequency at different time, changes in soil mass identified. Result shows that the TLGPR able to quantify the degree of change between two radargram. Moreover, due to the TLGPR is comparing the difference in frequency domain, it is capable to identify differences which are not visually notable from signal processed image.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114623769","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441624
Sónia Santos Assunćão, Viviana Sossa Arancibia, V. P. Gracia
In the Iberian village of Moli D’ Espigol, Tornabous, Spain, there are visible remains of an old civilization. The village is partially exposed, being the surrounding areas still covered with soil. In this area was applied Ground Penetrating Radar (GPR) to map the unknown extents. The aim is to identify archaeological remains, based on the previous knowledge of pre-Roman Iberian communities such as typical constructive type. The 250 MHz centre frequency GPR antenna provided information about the 3D location and geometric contours of possible roads, houses and associated walls. The GPR data was then compared with previous archaeological surveys with already existing excavations in the nearby zones. The output is vital for further archaeological surveys and to select the correct tools to dig, without damaging the valuable buried structures.
在西班牙托尔纳伯斯的伊比利亚村庄Moli D ' Espigol，可以看到古老文明的遗迹。村庄部分暴露在外，因为周围地区仍被土壤覆盖。在该地区应用探地雷达(GPR)对未知范围进行了测绘。目的是根据对前罗马时期伊比利亚社区的了解，如典型的建筑类型，来识别考古遗迹。250兆赫中心频率的探地雷达天线提供有关可能的道路、房屋和相关墙壁的3D位置和几何轮廓的信息。然后将探地雷达数据与之前的考古调查和附近地区已经存在的挖掘进行比较。这些结果对进一步的考古调查和选择正确的挖掘工具至关重要，同时又不会破坏有价值的埋藏结构。
{"title":"Geophysical survey of an archaeological Iberian Village by means of Ground Penetrating Radar","authors":"Sónia Santos Assunćão, Viviana Sossa Arancibia, V. P. Gracia","doi":"10.1109/ICGPR.2018.8441624","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441624","url":null,"abstract":"In the Iberian village of Moli D’ Espigol, Tornabous, Spain, there are visible remains of an old civilization. The village is partially exposed, being the surrounding areas still covered with soil. In this area was applied Ground Penetrating Radar (GPR) to map the unknown extents. The aim is to identify archaeological remains, based on the previous knowledge of pre-Roman Iberian communities such as typical constructive type. The 250 MHz centre frequency GPR antenna provided information about the 3D location and geometric contours of possible roads, houses and associated walls. The GPR data was then compared with previous archaeological surveys with already existing excavations in the nearby zones. The output is vital for further archaeological surveys and to select the correct tools to dig, without damaging the valuable buried structures.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116471761","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441602
M. Kaufmann, A. Klotzsche, H. Vereecken, J. van der Kruk
For agricultural studies, the determination of soil properties such as electromagnetic wave velocity and electrical conductivity is essential for characterizing important hydrological parameters such as soil water content. GPR has shown a high potential to estimate these parameters by using either large-scale common offset measurements and, point-scale common mid-point (CMP) or wide-angle reflection and refraction (WARR) measurements. A new multi-channel ground penetrating radar system combines both techniques and allows fast simultaneous measurements with up to eight channels. Thereby, up to seven receivers are continuous performing common offset measurements that can be rearranged to WARRs. This allows fast tracking of velocity changes along a measurement profile. Here, we present multi-channel and single-channel 500 MHz GPR data measured on a profile with different soil characteristics to demonstrate the potential of this new approach. To eliminate time shifts that are caused by the different cables and receivers of the multi-channel system a time offset correction is suggested. For single- and multi-channel WARR measurements velocity variations of the ground wave along the profile are determined using the semblance analysis. The comparison of the single- and multi-channel data indicate that multi-channel GPR is able to provide velocities similar to single-channel measurements, and, that the method can be used to determine changes of the groundwave velocity with a high spatial coverage.
{"title":"Simultaneous multi-channel GPR measurements for soil characterization","authors":"M. Kaufmann, A. Klotzsche, H. Vereecken, J. van der Kruk","doi":"10.1109/ICGPR.2018.8441602","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441602","url":null,"abstract":"For agricultural studies, the determination of soil properties such as electromagnetic wave velocity and electrical conductivity is essential for characterizing important hydrological parameters such as soil water content. GPR has shown a high potential to estimate these parameters by using either large-scale common offset measurements and, point-scale common mid-point (CMP) or wide-angle reflection and refraction (WARR) measurements. A new multi-channel ground penetrating radar system combines both techniques and allows fast simultaneous measurements with up to eight channels. Thereby, up to seven receivers are continuous performing common offset measurements that can be rearranged to WARRs. This allows fast tracking of velocity changes along a measurement profile. Here, we present multi-channel and single-channel 500 MHz GPR data measured on a profile with different soil characteristics to demonstrate the potential of this new approach. To eliminate time shifts that are caused by the different cables and receivers of the multi-channel system a time offset correction is suggested. For single- and multi-channel WARR measurements velocity variations of the ground wave along the profile are determined using the semblance analysis. The comparison of the single- and multi-channel data indicate that multi-channel GPR is able to provide velocities similar to single-channel measurements, and, that the method can be used to determine changes of the groundwave velocity with a high spatial coverage.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126199426","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441629
Emma F. Stubbs, D. Nobes
The McMurdo Ice Shelf flows obliquely onto the coastline northeast of Pram Point, Ross Island, Antarctica. Ground penetrating radar (GPR) imaging charted the detailed structure of the associated enigmatic pressure ridges and the deformation due to compressive forces. Two perpendicular GPR antenna orientations improved the positioning of subsurface features. Surface measurements of fold wavelengths and interlimb fold angles complemented GPR imaging. Stratigraphic reflections showed the folding style; GPR profiles revealed fold train complexities with no surface expression. Brine layer defects were easily recognized; firn layer defects were more difficult to detect. Three-dimensional brine layer imaging highlighted a diapiric feature. GPR did not penetrate the brine layer, except possibly beneath the tops of folds; results suggest sinusoidal folding continues to the base of the ice shelf. Synclinal thrust faults may be secondary features, altering the sinusoidal shelf shape to approximate the equilibrium profile that buoyancy forces require. Time-lapse GPR showed subsurface deformation, including: brine layer defects; subsurface changes near the transition, likely due to summer melt; and a fold between two crevasses identified from subsurface discontinuities. Time-lapse photographs complemented GPR profiling, allowing longer timescale analysis of pressure ridge deformation, and tracking years of fold emergence and break-up.
{"title":"Dynamics of the folds of the McMurdo Ice Shelf, Scott Base, Antarctica","authors":"Emma F. Stubbs, D. Nobes","doi":"10.1109/ICGPR.2018.8441629","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441629","url":null,"abstract":"The McMurdo Ice Shelf flows obliquely onto the coastline northeast of Pram Point, Ross Island, Antarctica. Ground penetrating radar (GPR) imaging charted the detailed structure of the associated enigmatic pressure ridges and the deformation due to compressive forces. Two perpendicular GPR antenna orientations improved the positioning of subsurface features. Surface measurements of fold wavelengths and interlimb fold angles complemented GPR imaging. Stratigraphic reflections showed the folding style; GPR profiles revealed fold train complexities with no surface expression. Brine layer defects were easily recognized; firn layer defects were more difficult to detect. Three-dimensional brine layer imaging highlighted a diapiric feature. GPR did not penetrate the brine layer, except possibly beneath the tops of folds; results suggest sinusoidal folding continues to the base of the ice shelf. Synclinal thrust faults may be secondary features, altering the sinusoidal shelf shape to approximate the equilibrium profile that buoyancy forces require. Time-lapse GPR showed subsurface deformation, including: brine layer defects; subsurface changes near the transition, likely due to summer melt; and a fold between two crevasses identified from subsurface discontinuities. Time-lapse photographs complemented GPR profiling, allowing longer timescale analysis of pressure ridge deformation, and tracking years of fold emergence and break-up.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125760891","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441592
S. Ivashov, A. Zhuravlev, V. Razevig, M. Chizh, T. Bechtel, L. Capineri, B. Thomas
In recent years, microwave methods for nondestructive testing (NDT) as an alternative to conventional ultrasound techniques, are becoming more common in the aerospace industry. Microwave sensors are applied to the examination of composite materials and structures which have many advantages over, and are replacing, traditional metal alloys. Composites typically have a better strength-to-weight ratio, and can withstand adverse weather conditions and corrosive environments. Such materials include polyurethane foam (PUF) insulation, silica fiber tiles (which were used for thermal protection in the American Space Shuttles and the Soviet spacecraft “Buran”), and honeycomb fiberglass which is frequently used in airplanes. The American and Soviet reusable launch system, and other space rockets, which fly on cryogenic fuel components, use PUF insulation to prevent both boiling-away of these components during prelaunch preparation, and the formation of surface ice which can damage the construction. The Space Shuttle Columbia catastrophe showed that PUF insulation coatings require diligent quality control during manufacture and use. Due to the high level of acoustic wave attenuation in porous composites, conventional ultrasonic diagnostic methods are ineffective for these materials, and holographic subsurface radar may be the best alternative. This work describes the development of a special experimental setup consisting of a vector network analyzer, used for signal generation and reception, and an electromechanical scanner which precisely moves the studied samples. The operating frequency band of the vector network analyzer allows experiments across a wide waveband up to 24 GHz. For registration and reconstruction of complex multifrequency microwave holograms, specialized software was developed. The software has special functions for improving quality of reconstructed holograms and suppressing reflections from samples borders. The setup was used for investigation of the operating frequency influence on subsurface imaging results. All of the samples contained intentional model defects typical of composite materials. Comparison of blind experimental imaging results for these test samples with maps of defects (revealed post-experiment) showed good agreement, proving effective detection and delineation of hidden flaws.
{"title":"Frequency Influence in Microwave Subsurface Holography for Composite Materials Testing","authors":"S. Ivashov, A. Zhuravlev, V. Razevig, M. Chizh, T. Bechtel, L. Capineri, B. Thomas","doi":"10.1109/ICGPR.2018.8441592","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441592","url":null,"abstract":"In recent years, microwave methods for nondestructive testing (NDT) as an alternative to conventional ultrasound techniques, are becoming more common in the aerospace industry. Microwave sensors are applied to the examination of composite materials and structures which have many advantages over, and are replacing, traditional metal alloys. Composites typically have a better strength-to-weight ratio, and can withstand adverse weather conditions and corrosive environments. Such materials include polyurethane foam (PUF) insulation, silica fiber tiles (which were used for thermal protection in the American Space Shuttles and the Soviet spacecraft “Buran”), and honeycomb fiberglass which is frequently used in airplanes. The American and Soviet reusable launch system, and other space rockets, which fly on cryogenic fuel components, use PUF insulation to prevent both boiling-away of these components during prelaunch preparation, and the formation of surface ice which can damage the construction. The Space Shuttle Columbia catastrophe showed that PUF insulation coatings require diligent quality control during manufacture and use. Due to the high level of acoustic wave attenuation in porous composites, conventional ultrasonic diagnostic methods are ineffective for these materials, and holographic subsurface radar may be the best alternative. This work describes the development of a special experimental setup consisting of a vector network analyzer, used for signal generation and reception, and an electromechanical scanner which precisely moves the studied samples. The operating frequency band of the vector network analyzer allows experiments across a wide waveband up to 24 GHz. For registration and reconstruction of complex multifrequency microwave holograms, specialized software was developed. The software has special functions for improving quality of reconstructed holograms and suppressing reflections from samples borders. The setup was used for investigation of the operating frequency influence on subsurface imaging results. All of the samples contained intentional model defects typical of composite materials. Comparison of blind experimental imaging results for these test samples with maps of defects (revealed post-experiment) showed good agreement, proving effective detection and delineation of hidden flaws.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130476392","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441566
Viviana Sossa Arancibia, V. P. Gracia, Sónia Santos Assunćão, O. Caselles, J. Clapes, R. G. Drigo
Corrosion is a common pathology in modernist (art nouveau) structures due to the employment of metallic reinforcement in masonry or mortar elements. This pathology can be the cause of important damage. Therefore, detection of corrosion is important in the cultural heritage assessment. Moreover, these cultural heritage structures are usually fragile and must be assessed with the minimum intervention, being non-destructive test (NDT) usually applied to these studies. However, detection of corrosion using NDT is difficult and only specific zones can be analyzed. Therefore, in most cases, results are incomplete. In this study, GPR was applied to obtain information to evaluate of the corrosion damage. The application of this methodology provides results from vast areas with a fast survey acquisition. GPR, as an NDT technique, covers large areas of study while other methods are constrained to a small areas or specific points. In this paper it is presented the study of the mosaic roofs in the Park Giiell, in Barcelona. This park is one of the most key Modernista (Art Noveau) complexes in this city. It is characterized by structures with roofs and banks with tessellation. Some of these structures are most likely supported by metallic elements, and seepage cause significant damage observed over the tessellation. The objective of the study was to define the possible existence of those metallic targets, determining their location. In the case of existence of metallic elements it determines which are the zones more affected by corrosion. Results demonstrate the existence of metallic supports in many parts, as well as some defined areas that could be damaged.
{"title":"Analysis of corrosion in historical heritage structures. The case study of the Park Güell in Barcelona","authors":"Viviana Sossa Arancibia, V. P. Gracia, Sónia Santos Assunćão, O. Caselles, J. Clapes, R. G. Drigo","doi":"10.1109/ICGPR.2018.8441566","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441566","url":null,"abstract":"Corrosion is a common pathology in modernist (art nouveau) structures due to the employment of metallic reinforcement in masonry or mortar elements. This pathology can be the cause of important damage. Therefore, detection of corrosion is important in the cultural heritage assessment. Moreover, these cultural heritage structures are usually fragile and must be assessed with the minimum intervention, being non-destructive test (NDT) usually applied to these studies. However, detection of corrosion using NDT is difficult and only specific zones can be analyzed. Therefore, in most cases, results are incomplete. In this study, GPR was applied to obtain information to evaluate of the corrosion damage. The application of this methodology provides results from vast areas with a fast survey acquisition. GPR, as an NDT technique, covers large areas of study while other methods are constrained to a small areas or specific points. In this paper it is presented the study of the mosaic roofs in the Park Giiell, in Barcelona. This park is one of the most key Modernista (Art Noveau) complexes in this city. It is characterized by structures with roofs and banks with tessellation. Some of these structures are most likely supported by metallic elements, and seepage cause significant damage observed over the tessellation. The objective of the study was to define the possible existence of those metallic targets, determining their location. In the case of existence of metallic elements it determines which are the zones more affected by corrosion. Results demonstrate the existence of metallic supports in many parts, as well as some defined areas that could be damaged.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133950258","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441628
S. Kowalczyk, Anna Lejzcrowicz, Beata Kowalczyk
A ground penetrating radar has been used to estimate the depth of groundwater table. The GPR measurements were conducted on esker deposits along the same profile and repeated five times during the year in autumn, spring, two times in summer and again in autumn. A shielded transmitting antenna with a nominal frequency of 250 MHz was used during the surveys. The accuracy of ground penetrating radar measurements to estimate the depth of groundwater occurrence is discussed in this paper. The results of estimation of groundwater table from GPR is compared with the level of groundwater table measured in piezometer.
{"title":"Groundwater table level changes based on ground penetrating radar images: a case study","authors":"S. Kowalczyk, Anna Lejzcrowicz, Beata Kowalczyk","doi":"10.1109/ICGPR.2018.8441628","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441628","url":null,"abstract":"A ground penetrating radar has been used to estimate the depth of groundwater table. The GPR measurements were conducted on esker deposits along the same profile and repeated five times during the year in autumn, spring, two times in summer and again in autumn. A shielded transmitting antenna with a nominal frequency of 250 MHz was used during the surveys. The accuracy of ground penetrating radar measurements to estimate the depth of groundwater occurrence is discussed in this paper. The results of estimation of groundwater table from GPR is compared with the level of groundwater table measured in piezometer.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131603321","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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