MAGNETIC FIELD SENSOR (B.)
(Ground Plane)
MODEL B-80
Description
The PRODYN Model B-80 Sensor is a B-Dot loop equivalent to the AFWL MODEL MGL-8. This sensor is the smallest of the B-Dot series of sensors developed by the Air Force Weapons Laboratory. Although this sensor was designed for use in a laboratory environment, it has been upgraded to include a weather cover for some protection. The sensor can be used as a B-Dot sensor, or it can be used to measure the time rate-of-change of surface current density since the magnetic field over a conductive sheet is related to surface current density. 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. The B-80 is basically identical to the Model B-S80. The B-80 version has the connector located below the ground plate while the B-S80 has the connector located on top of the ground plate.
This sensor has a parallel-series wiring configuration that cancels the electric field induced signals and makes the sensor's output signal the result of only the magnetic field. The equation pertinent to this device is:
® ®
Vo = Aeq . db = sensor output (in volts)
dt
where
®
Aeq = sensor equivalent area (m2)
®
B = magnetic flux density vector (teslas)
This sensor is a passive device; therefore, an external power source is not required. The sensor output is a radial configuration, Model B-80(R).
ELECTRICAL SPECIFICATIONS
Equivalent Area (Aeq) . . . . . . . . . 1 x 10-5 m2
Frequency Response (3 db point) . . . . ³ 7.5 GHz
Risetime (tr 10-90) . . . . . . . . . . £ 0.045 ns
Maximum Output (peak) . . . . . . . . . ± 100v
Output Connector . . . . . . . . . . . . Female SSMA
PHYSICAL SPECIFICATIONS
Mass: 15 grams
