Mag 3D experimental apparatus

Apparatus description

This experiment is composed by a set of 3D printed parts that holds a rectangular coils capable of rotating on an axis. In the middle point of this coils a rail supports a magnetic field detector that can move along side. Based on this geometric configuration it is possible to map the magnetic field. The setup comprises two step-motors able (i) to rotate the coil around the middle longitudinal axis and (ii) to move the magnetic probe apart. The sensor is a popular 3-axis magnetometer () and can detect ranges +/-1.6 mT. For ultra-high precision is used the 155 Hz refresh rate but due to this frequency being very close to the network frequency (50Hz) only ~3 points are taken for each cycle.This can be mitigated by sampling over many cycles.

Mechanical Assembly

The core of the experiment is a support structure with a rectangular-shape to hold a coil with 50 wounds of varnished copper wire (awg 24). This support is hold by a squirrel cage able to rotate it in steps of 0.5º. On the base, a rail carries on the top the magnetic sensor to collect the signal.

Electronic circuit

Electronic component assembly

   3.2 Step-motor drivers
   3.3 Light source and detection

4 Optical path

   4.1 Optical path alignment
   4.2 Optical path calibration

5 Software

   5.1 Raspberry FREE proxy
       5.1.1 Communication model between the FREE-Server and the Raspberry PI
       5.1.2 Communication model between the Raspberry PI and the Arduino Mega
   5.2 Firmware