Date of Graduation

5-2020

Document Type

Thesis

Degree Name

Bachelor of Science in Electrical Engineering

Degree Level

Undergraduate

Department

Electrical Engineering

Advisor/Mentor

Saunders, Robert

Abstract

As violent attacks have increased at different venues such as schools, the need for affordable and effective metallic weapon detection has increased. Probing and scanning detection wands are the most common seen in use by guards. This project seeks to combine both probing and scanning coils into one pulse induction metal detector. The use of one drive circuit for both LC coil tank circuits further economizes the system. ANSYS Maxwell electromagnetic simulations are used to develop the geometries needed for sensitive metal detection. Analytical, simulation, and experimental methods are used to first verify the design flow for solenoid inductors. These methods are then applied to further simulations for varying inductor lengths, turn numbers, and diameter. The results of these simulations are used to formulate a final design for a sensitive detector. The inductive couplings between metallic objects and search coils is evaluated using simulation and experimental methods. Both resulted in close agreement; superimposed signals of different frequencies are found to provide useful detection value by their changes in peak to peak voltage.

Keywords

Metal detection; pulse induction; inductance; solenoid

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