Magnetometers

Overview

Magnetometers are miniature electro-mechanical devices that measure the magnetic field they are placed in.

Interference

Soft-Iron

Soft-iron materials are ones which are not magnetic themselves, but generate a magnetic field.

This includes:

  • Ferrous EMI shielding
  • Screws
  • Battery contacts

Hard-Iron

Hard-iron materials are ones which are naturally magnetic.

This includes:

  • Speakers
  • Proximity switches
  • Hall-effect sensors

Electromagnetic

Magnetometers are not directly affected by electromagnetic waves. However, if these waves pass through conductive substances (including those inside the magnetometer itself), these can induce a current which inturn creates a magnetic field.