MAGNETIC FIELD (B) & SURFACE CURRENT (J) SENSOR
MODEL B-S80
DESCRIPTION
The PRODYN Model B-S80 sensor is a B-Dot loop equivalent to the AFWL Model MGL-S8. 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-S80 is basically identical to the Model B-80. The B-S80 version has a surface mounted connector while the B-80 has the connector located below the base or 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 sensor when used as a B-Dot sensor is provided on the Model B-80 Data Sheet. The equation relating to surface current density measurements is:
Vo = Aeq mo dJs sinq = sensor output (in volts)
dt
where
Aeq = sensor equivalent area (m2)
mo = permeability of free space (4p x 10-7 H/m)
Js = surface current density (Amps/m)
sinq = angle between sensor axis and Js vector
The sensor is a passive device; therefore, an external power source is not required. The sensor output is a radial configuration, Model B-S80(R).
ELECTRICAL SPECIFICATIONS
Equivalent Area (Aeq) . . . . . . . . . . 1 x 10-5 m2
Frequency Response (3 db point) . . . . > 5 GHz
Risetime (tr 10-90) . . . . . . . . . . . < 0.07 ns
Maximum Output (peak) . . . . . . . . . . + 100v
Output Connector . . . . . . . . . . . . Female SSMA
PHYSICAL SPECIFICATIONS
Mass: 15 grams SSMA Connector
