Research of the metal detector based on finite element analysis

The transport type metal detector balanced differential transmission coil to detect metal particles. In the process of industrial production, other metal production equipment, transmission belt of steel and other external factors are influenced by the test. Repeated experiments can reduce the interference, but will affect the production efficiency, this paper provides a more efficient and effective finite element modeling method, greatly shorten the development cycle. First of all, it's introduced the actual experimental system of metal detectors and the geometric model. Then, using the finite element simulation software COMSOL which can build two-dimensional modeling method to model the balance coil, analyze the magnetic field and the output current amplitude in order to found the relationships between the amplitude of output current and materials, size, location of the metal objects. Finally, the curves of numerical simulation and practical measure are accomplished. The research results provide some theoretical basis for the design of the metal detector, and have certain application value.