MAGNETIC FIELD (B^.) & SURFACE CURRENT (J^.) SENSOR

MODEL B-S25

DESCRIPTION

The PRODYN Model B-S25 is a half loop high frequency sensor which can be used as a B-Dot sensor or 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. When mounted to a conducting surface, the B-S25 produces a voltage output in response to a time variant B field. The loop area is encapsulated to provide breakdown resistance and protection from the environment.

The equation pertinent to this sensor, when used as a B-Dot sensor, is provided on the Model B-24 Data Sheet. The equation relating to surface current density measurements is:

V_o = A_eq m_o dJ_s sin q = 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)

sin q = angle between axis and Js vector

ELECTRICAL SPECIFICATIONS

Equivalent Area (Aeq Differential) . . . . . . . 4.5 x 10-6m2

Frequency Response (3 db point) . . . . . . . . > 11 GHz

Risetime (tr 10-90) . . . . . . . . . . . . . . ~ .032 ns

Maximum Output (peak) . . . . . . . . . . . . . ± 500V RMS

Output Connector . . . . . . . . . . . . . . . . SMA (male)

PHYSICAL SPECIFICATIONS