Jason and Alon's Coil Corner

The second iteration of testing the prototype was a success. We re-coiled the transmitting coil to give it a stronger hold on the container as well as add a few more turns for transmission strength. The test circuit was very basic, as shown in figure 1 . The output signal was identical to the input signal in frequency, but varied in phase and amplitude. In figure 2 , the received signal is shown in yellow on top and the transmitted is shown in green on the bottom. To test the effectiveness of this system in a metal detecting capacity, we held metal objects over the coils and saw what happened on the oscilloscope screen. The result was a small change in amplitude on the receiving coil, but no perceptible change in phase was seen. Figure 1: Test Circuit Diagram Figure 2: Transmitted and Received signals Figure 3: Circuit setup

Welcome to the inaugural post on Jason and Alon's Coil Corner! In this episode, we began construction and analysis on a small prototype coil we will be using for testing until the final coil case is printed. The receiving coil is the coil wrapped around the small pink container placed inside the larger glass container. The transmitting coil is wrapped around the top of the larger glass container. The feedback coil, which is used to lessen the effects of the transmitting coil on the receiving coil, is wrapped around the receiving coil.  This coil is tested by using a function generator to put an alternating current through the transmitter coil. Since the coil is basically a large inductor, it generates an alternating magnetic field which should be picked up by the receiving coil. We were unable to see any induced signal on the receiving coil, which may have resulted from shorts on the transmitting coil from twisting the magnet wire, issues with the testing circuit, and/or is...