The metal detector as an archaeological tool: good or bad? Over the past six decades, the metal-detector has taken both the public as the archaeology by storm. The amount of people that has started to use it both as a hobby and in their jobs, is consistently growing, and the finds that it has provided has been of great value to the archaeologists. This paper examines how the metal-detector has been used and what kind of information it has provided for archaeologists. Firstly, there will be a short presentation of the metal-detector as a tool where its history and function get depicted. Thereafter a short summary around the legislation concerning metal-detectors follows of both Sweden and Denmark, which will end with a comparison. Then, the archaeological excavations with metal-detectors that has taken place in Uppåkra and Gudme during the last 40 years gets presented. There will be a short historical comprehension around both places which is followed by the surveys that has been conducted with metal-detectors and some of the finds that has been made. Finally, there will be a short summary around the debate in Sweden whether the legislation concerning metal-detectors should be liberalized or not. The text will end with a discussion where the author talks about his thoughts of metal-detectors in archaeology.

This thesis focuses on some mathematical aspects and a few recent applications of the polarization tensor (PT). Here, the main concern of the study is to characterize objects presented in electrical or electromagnetic fields by only using the PT. This is possible since the PT contains significant information about the object such as shape, orientation and material properties. Two main applications are considered in the study and they are electrosensing fish and metal detection. In each application, we present a mathematical formulation of the PT and briefly discuss its properties. The PT in the electrosensing fish is actually based on the first order generalized polarization tensor (GPT) while the GPT itself generalizes the classical PT called as the P\'lya-Szeg\H PT. In order to investigate the role of the PT in electrosensing fish, we propose two numerical methods to compute the first order PT. The first method is directly based on the quadrature method of numerical integration while the second method is an adaptation of some terminologies of the boundary element method (BEM). A code to use the first method is developed in \textit while a script in \textit is written as an interface for using the new developed code for BEM called as \textit. When comparing the two methods, our numerical results show that the first order PT is more accurate with faster convergence when computed by \textit. During this study, we also give a strategy to determine an ellipsoid from a given first order PT. This is because we would like to propose an experiment to test whether electrosensing fish can discriminate a pair of different objects but with the same first order PT such that the pair could be an ellipsoid and some other object. In addition, the first order PT (or the P\'{o}lya-Szeg\H{o} PT) with complex conductivity (or complex permittivity) which is similar to the PT for Maxwell's equations is also investigated. On the other hand, following recent mathematical foundation of the PT from the eddy current model, we use the new proposed explicit formula to compute the rank 2 PT for a few metallic targets relevance in metal detection. We show that the PT for the targets computed from the explicit formula agree to some degree of accuracy with the PT obtained from metal detectors during experimental works and simulations conducted by the engineers. This suggests to alternatively use the explicit formula which depends only on the geometry and material properties of the target as well as offering lower computational efforts than performing measurements with metal detectors to obtain the PT. By using the explicit formula of the rank 2 PT, we also numerically investigate some properties of the rank 2 PT where, the information obtained could be useful to improve metal detection and also in other potential applications of the eddy current. In this case, if the target is magnetic but non-conducting, the rank 2 PT of the target can also be computed by using the explicit formula of the first order PT.

The goal of this project is explore and study the ways of metal detecting and create a metal detector for industrial use. When the device were inventing, a lot of methods were studied and the impulse detect method were chosen as the most perspective way of metal detecting, thanks to a huge electronics parts possibilities. After experiences with preceding device was necessary to redesign it. Main target of this thesis is to increase the computing power of detector. For this purpose will device need a new microcontroller. Device will communicate with PC trough a USB port. The device will have a battery which allows device to run for a few hours. Processing of measured data will be make even with DFT which will lead to better analyze of mass and type of conductor under device.

Incorporating geophysical technologies into forensic investigations has become a growing practice. Oftentimes, forensic professionals rely on basic metal detectors to assist their efforts during buried weapons searches, perhaps being used by someone with negligible or limited training, in turn slowing down investigation time and destroying the scene. This has created a need for research in the area of weapons searches, specifically to formulate guidelines for advanced geophysical methods that may be appropriate for locating weapons that have been discarded or buried by criminals attempting to conceal their involvement in a crime. This research project was the first to demonstrate the utility of geophysical technologies at a crime scene or a suspected weapon burial site by detecting and identifying specific types of buried metal targets, including an array of firearms. Controlled testing of 32 buried targets (including sixteen decommissioned street-level firearms, six pieces of assorted scrap metals, and ten blunt or bladed weapons) was conducted using a basic all-metal detector, an advanced metal detector, and a magnetic locator. Overall, a number of important conclusions were drawn from the research project. All forensic targets included in the project were detected with the basic all-metal detector, but only down to the shallower depths. The magnetic locator provided the deepest detection for the largest firearms, scrap metals, and miscellaneous weapons. However, not all forensic targets included in the project were detected due to the detection capabilities inherent to the magnetic locator (i.e. only detecting ferromagnetic items). The advanced metal detector was best suited for detecting the handguns and was able to detect most of the targets, excluding a number of items comprised of iron, down to deeper depths using the factory presets.

Subject of this Diploma thesis is the design of metal detector and luggage X-ray screening. The thesis concerns with design of frame metal detector and luggage x-ray with focus on visual appeal, keeping of functional elements and concept of construction solution. Main objective is to find solution how to connect aesthetic, ergonomic and technical aspect. Complete analysis leads to design of metal detector and luggage X-ray screening. These appliances then appeal as compact system with uniform design. Also the machines can be used separately. Design of this system of appliances is solved through ergonomic, psychologic, technical and aesthetic aspects.

Text in English with abstracts in English, Afrikaans and isiXhosa / British forces captured the Cape of Good Hope from the Batavian Government in 1806. The archaeological investigation into the Battle of Blaauwberg aims to identify the strategic use of the landscape by both sides focusing on specific geographic areas. Metal detector surveys and the mapping of archaeological material clarified the various battle positions within the reconstructed historical environment. Analysis of the artefacts provided insight into their use and the strategies followed by both armies. Altogether the evidence illuminated the use of the landscape and its influence on the course of the battle. This unique multi-pronged study of a South African battlefield and its material cultural record sheds new light on the 1806 battle, thereby complementing and refining prevailing historical interpretations. It explores methodological issues and approaches that are critical to the domain of battlefield archaeology in South Africa, where a large number of battle sites still await archaeological investigation. / Britse magte het die Kaap die Goeie Hoop in 1806 van die Bataafse Regering verower. Die argeologiese ondersoek na die Slag van Blaauwberg is gerig op die identifikasie van die strategiese gebruik van die landskap deur beide kante met die fokus op spesifieke geografiese areas. Metaalverklikkeropnames en die kartering van argeologiese materiaal het die onderskeie gevegsposisies in die gerekonstrueerde geskiedkundige omgewing opgeklaar. ’n Ontleding van die artefakte het insig gebied in hul gebruik en die strategieë wat beide gevegsmagte gevolg het. In die geheel gesien, belig die getuienis die gebruik van die landskap en hoe dit die verloop van die geveg beïnvloed het. Hierdie unieke meervlakkige studie van ’n Suid-Afrikaanse slagveld en sy materiële kultuurrekord werp nuwe lig op die 1806-veldslag en sodoende word bestaande historiese interpretasies aangevul en verfyn. Dit verken metodologiese kwessies en benaderings wat kritiek is vir die domein van slagveldargeologie in Suid-Afrika waar ’n groot aantal gevegsterreine nog argeologies ondersoek moet word. / Imikhosi yaseBhritane yayihlutha iKoloni Yethemba eyayibizwa ngokuba yiCape of Good Hope, iyihlutha kurhulumente waseBatavia ngonyaka we-1806. Uphando lwezixhobo zakudala zexesha ledabi iBattle of Blaauwberg lujolise ekuqwalaseleni ubuchule bokusetyenziswa kobume belizwe ngala macala mabini, lugxininisa kwiindawo ezithile. Isifundo sembali senza uqikelelo lobunjani bedabi, kwaqhutywa iintlolo zimvo ezisebenzisa izixhobo zesinyithi nokuphengululwa kwezixhobo ezifumaneke kwizakhiwo zakudala nezacacisa iindawo ezahlukeneyo zedabi. Izixhobo zokusebenza ezafunyaniswayo zatyhila ulwazi lwendlela ezazisetyenziswa ngayo namacebo obulumko awayesetyenziswa yimikhosi yamacala omabini. Ubungqina bacacisa ukusetyenziswa kobume belizwe nefuthe lobo bume ekuqhubekeni kwedabi. Le ndlela ikhethekileyo, nenobuchule obuziindidi ezahlukeneyo, yokufunda indawo yedabi laseMzantsi Afrika, nengxelo yezinto zenkcubeko, inika ulwazi olutsha ngeli dabi lowe-1806, kwaye yongeza ikwacolisisa indlela yokutolika imbali yeli dabi. Kuphandwa imibandela yeendlela zokwenza namacebo abaluleke kakhulu kwicandelo lophando lwezixhobo zakudala zamadabi eMzantsi Afrika, apho iziza zamadabi eziliqela zisalinde ukuba kuphandwe ngazo. / Anthropology and Archaeology / M.A. (Archaeology)