Magnetic field (B-DOT) sensors

Inductive magnetic field probes, also known as B-dot probes, are used for measuring magnetic fields. PRODYN sensors 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 probes 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.