MAGNETIC FIELD SENSOR (B.)
(GROUND PLANE)
MODEL B-30
DESCRIPTION
The PRODYN Model B-30 sensor is a B-Dot loop equivalent to the AFWL Model MGL-3. The sensor consists of a half-cylinder loop on a base plate that when mounted to a conducting surface produces a voltage output in response to a time variant B field. This B-Dot sensor can also be used to measure surface current density since the magnetic field over a conductive sheet is related to surface density (see Model B-S40 Data Sheet for equations).
This sensor is essentially one-half of a cylindrical loop with a gap structure located in the middle of each of its two quadrants. The voltage developed at the gaps are combined by a parallel-series wiring configuration that averages the signal over the loop structure. By this arrangement, signals induced by electric fields normal to the ground plane are cancelled out and a quarter-turn loop driving the output cable results. The pertinent equation for this device is:
® ®
Vo = Aeq . db = sensor output (in volts)
dt
where
®
Aeq = sensor equivalent area (m2)
®
B = magnetic flux density vector (teslas)
The sensor is a passive device; therefore, an external power source is not required. The sensor is equipped for purging with a gas such as dry air, nitrogen, or SF6.
ELECTRICAL SPECIFICATIONS
Equivalent Area (Aeq) . . . . . . . . . . 1 x 10-1 m2
Frequency Response (3 db point) . . . . > 78 MHz
Risetime (tr 10-90) . . . . . . . . . . . < 4.5 ns
Maximum Output (peak) . . . . . . . . . . + 5kV
Output Connector . . . . . . . . . . . . 50 W GR-874*
PHYSICAL SPECIFICATIONS
ORDERING INFORMATION
* This can be changed to a Type N, SMA, etc. (Max output voltage will be affected.)