MAGNETIC FIELD SENSOR (B.)
(Free Field)
MODEL B-60 (A or R)
DESCRIPTION
The PRODYN Model B-60 sensor is a B-dot loop equivalent to the AFWL Model MGL-6. The sensor is a full cylinder loop that measures the time rate-of-change of a magnetic field. It is a portable device designed for making free field measure-ments. For this type of measurement, the sensor should be supported by dielectric materials and placed not closer than two sensor diameters from conducting surfaces.
The sensor design consists of a conducting cylinder which contains four equally spaced longitudinal gap structures. The voltage developed across each gap is carried on pairs of 200-ohm transmission lines, which at opposite gaps are connected in parallel to 100-ohm cables. These cables in turn are connected to the 100-ohm twinax output cable. This design is effectively a half-turn loop driving the output connector. The gap and wiring configuration used causes any responses to electric fields to be cancelled and the sensor's output signal to result from only magnetic fields. The equation relating to the sensor 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; thus, an external power source is not required. It's available with an axial output, Model B-60(A), or a radial output, Model B-60(R).
ELECTRICAL SPECIFICATIONS
Equivalent Area (Aeq) . . . . . . . . . . . . 1 x 10-3 m2
Frequency Response (3 dB Point) . . . . . . . > 840 MHz*
Risetime (tr 10-90) . . . . . . . . . . . . . < .42 ns
Maximum Output (peak) . . . . . . . . . . . . ± 2 KV
Output Connector . . . . . . . . . . . . . . . 2 female 50 W SMA or
100 W Twinax (modified GR-874)
* Frequency response for the B-60 (MGL-6) was originally calculated at 1.8 GHz through the development with the Air Force Weapons Laboratory. After careful investigation, PRODYN believes an error was made and the 840 MHz response is correct.
PHYSICAL SPECIFICATIONS
Mass: 550g (typ)
ORDERING INFORMATION
Customer to specify axial (A) or radial (R) version.