Free-Field Magnetic Field (B-DOT) Sensors

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Magnetic field (B-DOT) sensors

Inductive magnetic field probes, also known as B-DOT probes, are used for measuring magnetic fields (h fields). Prodyn h field probes are small to medium-sized high frequency sensors available in the following formats:

  • free-field
  • ground plane/surface current
  • radiation hardened

…with sensitive areas of up to 0.1 m² or upper 3 dB points of 11 GHz

How a B-dot probe works

B-DOT sensors generate an output voltage when immersed in a time-changing magnetic field. The operation is based on Faraday’s Law in which time-varying magnetic fields perpendicular to and linking the inductive coil windings induce a voltage proportional to the time derivative of the magnetic field. The voltage output from the probe is measured as voltage across a load impedance – typically 50 Ω.

Output processing

The raw dB / dt -generated probe signal can be time-integrated to provide a local measurement using an analog integrating circuit or recorded and integrated in post-processing.

Product Information

The Magnetic field sensors support standards testing for EMC, EMP, HIRF, NEMP etc., including key standards such as:

  • MIL-STD-188-125
  • MIL-STD-461G
  • DEF STAN 59-188
  • DEF STAN 59-411