Metal detector, Water Flow & Heartbeat Sensor
Metal detector, Water Flow & Heartbeat Sensor Metal detector Introduction Metal detector is a device that can detect metal, the basics can make a sound when it is near some metal. Metal detectors work on the principle of transmitting a magnetic field and analysing a return signal from the target and environment. when some metals are coming close to the coil the amplitude of the reflective pulse is getting little lower and a duration of the pulse a little longer. The need for detection is very clear to protect our self from any kind of danger. Principle of operation The operation of a metal detector is based on the principle of electromagnetic induction. Metal detectors contain one or more inductor coils. When metal is placed in a close proximity to a varying magnetic field (generated by the coil or coils), currents are induced in the metallic part. These current are called eddy Currents. The eddy Currents, in turn, induce their own magnetic field ( called eddy field). These f