<p>The purpose of this thesis was to design an electrical system for use in a ballistic test at the Swedish National laboratory of forensic science (SKL). The detector unit would use four main parts: coilsystem, transmitter, reciever and indicator. The coilsystem would be based on a balanced system using three coils. One that creates a magneticfield and the other two will sense the differences when a metallobject is in the coilsystem. </p><p>This report starts out by investigating possible solutions for this specific task followed by a description of the physics that the metaldetector use. Then a description of the design of a scaled metaldetector model followed by testing and evalution. The results are then beeing used when the design and testing of the full scale detector. The possible solutions for the transmitter-, reciver- and indicator circuit are then beeing described and also simulated. Last in this report a evalution and suggestions of further improvments are presented.</p>

The purpose of this thesis was to design an electrical system for use in a ballistic test at the Swedish National laboratory of forensic science (SKL). The detector unit would use four main parts: coilsystem, transmitter, reciever and indicator. The coilsystem would be based on a balanced system using three coils. One that creates a magneticfield and the other two will sense the differences when a metallobject is in the coilsystem. This report starts out by investigating possible solutions for this specific task followed by a description of the physics that the metaldetector use. Then a description of the design of a scaled metaldetector model followed by testing and evalution. The results are then beeing used when the design and testing of the full scale detector. The possible solutions for the transmitter-, reciver- and indicator circuit are then beeing described and also simulated. Last in this report a evalution and suggestions of further improvments are presented.

In this paper I assess the potential for improvement in the documentation of metal detecting in the Swedish contract archaeology. I then investigate how such an improvement could be achieved. The study consists of three parts. I begin by defining what makes up high-quality documentation of metal detecting. I then use this definition to develop criteria for an assessment system. In the second part I use this assessment system for a quantitative analysis of archaeological archive reports from four of the largest contract-archaeology organizations in the Lake Mälaren area. Finally I report on interviews I have made with representatives from two of the studied organizations to seek possible explanations for the results of my analysis. My study confirms that there is considerable room for improvement in the analyzed archive reports, and sheds light on what parts of the documentation show frequent flaws. The results suggest that information specific to metal detecting is the most lacking, such as the selection of metal indications and fieldwork conditions. But there are also considerable flaws in more elementary information about surveys, which would probably never be accepted if it were a question of more traditional fieldwork methods.