title: Shape and deformation measurement using heterodyne range imaging technology

authors: Conroy, Richard M.

abstract: Range imaging is emerging as a promising alternative technology for applications that require non-contact visual inspection of object deformation and shape. Previously, we presented a solid-state full-field heterodyne range imaging device capable of capturing three-dimensional images with sub-millimetre range resolution. Using a heterodyne indirect time-of-flight configuration, this system simultaneously measures distance (and intensity), for each pixel in a cameras field of view. In this paper we briefly describe our range imaging system, and its principle of operation. By performing measurements on several metal objects, we demonstrate the potential capabilities of this technology for surface profiling and deformation measurement. In addition to verifying system performance, the reported examples highlight some important system limitations. With these in mind we subsequently discuss the further developments required to enable the use of this device as a robust and practical tool in non-destructive testing and measurement applications.

text: Shape and deformation measurement using heterodyne range imaging technology Range imaging is emerging as a promising alternative technology for applications that require non-contact visual inspection of object deformation and shape. Previously, we presented a solid-state full-field heterodyne range imaging device capable of capturing three-dimensional images with sub-millimetre range resolution. Using a heterodyne indirect time-of-flight configuration, this system simultaneously measures distance (and intensity), for each pixel in a cameras field of view. In this paper we briefly describe our range imaging system, and its principle of operation. By performing measurements on several metal objects, we demonstrate the potential capabilities of this technology for surface profiling and deformation measurement. In addition to verifying system performance, the reported examples highlight some important system limitations. With these in mind we subsequently discuss the further developments required to enable the use of this device as a robust and practical tool in non-destructive testing and measurement applications.

year: 2006-11

title: Comparing hardness tests to estimate, evaluate, and analyse the mechanical properties of structural steel

authors: Gopi, Govind

abstract: The paper investigates the mechanical properties of structural steels, focusing on hardness and toughness, which are important indicators used in industrial applications. In total, four major hardness testing methods were analysed: Vickers, Rockwell, Brinell, and Leeb, and the Charpy impact test was used to measure toughness. The hardness tests evaluated the precision with which steel resistance to deformation can be determined under different conditions, and the Charpy test examined their energy absorption capacity in case of sudden fractures and tensile testing was estimated on them to study the range of yield strength and ultimate tensile strength. This research has conducted 288 experimental tests to evaluate the correlation between various hardness testing methods (Brinell, Vickers, Rockwell, and Leeb) and the mechanical properties of the structural steel samples. Further, 42 experimental tests were performed for the Charpy impact test to evaluate a correlation between Charpy impact values and mechanical properties of the structural steel samples. 330 samples were prepared for the respective tests, representing various structural steel grades (Grade 300, 350, and 400). Among different grades of steel samples, 350-grade steel exhibited a higher impact energy of 94.4 J. Both Charpy Impact Values and Hardness Test Values were plotted against ultimate tensile strength and yield strength to determine if there is a correlation between the properties. The results reveal a better accuracy of Vickers and Rockwell tests as they revealed only an error percentage of 2.5% and 1.9%, respectively, especially for fine-grained materials, while Leeb is characterized by good convenience in large-scale testing at the site. Although the Brinell test is very effective for coarse structures, it was not as precise as martensite in more complex microstructures. Both hardness and tensile strength showed a strong correlation, indicating that hardness may accurately predict the material strength. The study also highlights the reverse relationship between hardness and toughness.  This research contributes to structural steel testing by proposing methods to predict mechanical properties using non-destructive testing techniques. It sets the stage for future improvementsin hardness testing models by incorporating factors like microstructural variations, strain hardening, and heat treatment, which can enhance the accuracy of predictions. Furthermore, the research underscores the importance of portable hardness testing methods and emphasizes the need for improved calibration protocols to ensure more accurate in-situ measurements.

text: Comparing hardness tests to estimate, evaluate, and analyse the mechanical properties of structural steel The paper investigates the mechanical properties of structural steels, focusing on hardness and toughness, which are important indicators used in industrial applications. In total, four major hardness testing methods were analysed: Vickers, Rockwell, Brinell, and Leeb, and the Charpy impact test was used to measure toughness. The hardness tests evaluated the precision with which steel resistance to deformation can be determined under different conditions, and the Charpy test examined their energy absorption capacity in case of sudden fractures and tensile testing was estimated on them to study the range of yield strength and ultimate tensile strength. This research has conducted 288 experimental tests to evaluate the correlation between various hardness testing methods (Brinell, Vickers, Rockwell, and Leeb) and the mechanical properties of the structural steel samples. Further, 42 experimental tests were performed for the Charpy impact test to evaluate a correlation between Charpy impact values and mechanical properties of the structural steel samples. 330 samples were prepared for the respective tests, representing various structural steel grades (Grade 300, 350, and 400). Among different grades of steel samples, 350-grade steel exhibited a higher impact energy of 94.4 J. Both Charpy Impact Values and Hardness Test Values were plotted against ultimate tensile strength and yield strength to determine if there is a correlation between the properties. The results reveal a better accuracy of Vickers and Rockwell tests as they revealed only an error percentage of 2.5% and 1.9%, respectively, especially for fine-grained materials, while Leeb is characterized by good convenience in large-scale testing at the site. Although the Brinell test is very effective for coarse structures, it was not as precise as martensite in more complex microstructures. Both hardness and tensile strength showed a strong correlation, indicating that hardness may accurately predict the material strength. The study also highlights the reverse relationship between hardness and toughness.  This research contributes to structural steel testing by proposing methods to predict mechanical properties using non-destructive testing techniques. It sets the stage for future improvementsin hardness testing models by incorporating factors like microstructural variations, strain hardening, and heat treatment, which can enhance the accuracy of predictions. Furthermore, the research underscores the importance of portable hardness testing methods and emphasizes the need for improved calibration protocols to ensure more accurate in-situ measurements.

year: 2024-11-23

title: Indigenous Peoples and the Protection of Their Secret Knowledge: A Promising Pathway Ahead

authors: Masoni, Claudia

abstract: This work focuses on the intangible, secret aspects of indigenous peoples’ cultures and how such secret information is protected by indigenous guardians or holders. This is because much of indigenous culture is imbued with spiritual significance for indigenous peoples and, consequently, it is not made available to the rest of the community and the world at large.
This thesis examines the reasons why it is important to preserve indigenous cultures and secret practices that today survive in indigenous communities. The thesis demonstrates that secrecy is seen as essential to the preservation of indigenous secret knowledge. Indigenous guardians are responsible for the preservation of the information, and they commonly use secrecy to preserve the knowledge and, when they share it, they choose limited, confidential circumstances to do so. This work argues that it is important to make reasonable space in the existing body of laws which have so far failed to effectively protect indigenous secret practices and information. The case study described in this thesis helps understand how states are currently trying to listen, understand and accommodate indigenous claims brought forward at the national and international fora. The thesis reviews the legal protection currently available to indigenous secret knowledge in national and international law. The first 6 chapters introduce indigenous cultures, holism and indigenous peoples and international law, and chapter 7 describes the New Zealand case Wai 262 and the recommendations given by the Waitangi Tribunal. The remaining chapters analyse indigenous cultures and intellectual property laws, identifying gaps in the existing mechanisms for protection and underlining why, as of today, intellectual property law does not guarantee adequate protection to indigenous secret knowledge. The last chapter analyses the law of breach of confidence as a possible instrument to safeguard indigenous secret information and the duty of care performed by indigenous guardians in preserving such knowledge. It argues that the existing law of confidentiality can usefully evolve to protect cultural secret information as a growing category in its own right and that indigenous secret information can find protection as confidential information.

text: Indigenous Peoples and the Protection of Their Secret Knowledge: A Promising Pathway Ahead This work focuses on the intangible, secret aspects of indigenous peoples’ cultures and how such secret information is protected by indigenous guardians or holders. This is because much of indigenous culture is imbued with spiritual significance for indigenous peoples and, consequently, it is not made available to the rest of the community and the world at large.
This thesis examines the reasons why it is important to preserve indigenous cultures and secret practices that today survive in indigenous communities. The thesis demonstrates that secrecy is seen as essential to the preservation of indigenous secret knowledge. Indigenous guardians are responsible for the preservation of the information, and they commonly use secrecy to preserve the knowledge and, when they share it, they choose limited, confidential circumstances to do so. This work argues that it is important to make reasonable space in the existing body of laws which have so far failed to effectively protect indigenous secret practices and information. The case study described in this thesis helps understand how states are currently trying to listen, understand and accommodate indigenous claims brought forward at the national and international fora. The thesis reviews the legal protection currently available to indigenous secret knowledge in national and international law. The first 6 chapters introduce indigenous cultures, holism and indigenous peoples and international law, and chapter 7 describes the New Zealand case Wai 262 and the recommendations given by the Waitangi Tribunal. The remaining chapters analyse indigenous cultures and intellectual property laws, identifying gaps in the existing mechanisms for protection and underlining why, as of today, intellectual property law does not guarantee adequate protection to indigenous secret knowledge. The last chapter analyses the law of breach of confidence as a possible instrument to safeguard indigenous secret information and the duty of care performed by indigenous guardians in preserving such knowledge. It argues that the existing law of confidentiality can usefully evolve to protect cultural secret information as a growing category in its own right and that indigenous secret information can find protection as confidential information.

year: 2017