Mag 3D experimental apparatus - Revision history

Ist12916: /* Apparatus description */

2026-04-24T12:26:07Z

Apparatus description

Ist12916: /* Mechanical Assembly */

2026-04-23T07:33:17Z

Mechanical Assembly

Ist12916: /* Mechanical Assembly */

2026-04-22T13:02:30Z

Mechanical Assembly

Ist12916: Created page with "=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 coi..."

2026-02-12T07:30:31Z

Created page with "=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 coi..."

New page

=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.

==Order of assembly==

=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

@@ Line 4: / Line 4: @@
 =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 22/0.64mm). This support is hold by a squirrel cage able to rotate it in steps of 0.5º.
+The core of the experiment is a support structure with a rectangular-shape to hold a coil with 30 wounds of varnished copper wire (AWG 22/0.64mm). 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, 5mm below the coil when in vertical position, meaning that the magnetic field is vertical and the windings are in the horizontal plane.
+On the base, a rail carries on the top the magnetic sensor to collect the signal, 7mm below the coil center when in vertical position. Note that the orientation of the coil is dictated by the magnetic field, meaning in this situation that the magnetic field is vertical and the windings are in the horizontal plane.
 ==Order of assembly==

@@ Line 2: / Line 2: @@
 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=