Description
PRODYN ground plane/surface current type magnetic field sensors can be used as a B-dot sensor or to measure the time rate-of-change of surface current density because the magnetic field over a conductive sheet is related to surface current density.
The sensors 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. Each 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 when used as a B-dot sensor is provided on the datasheet.
Points to Note:
- Axial v radial: sensors are available with axial or radial output.
- BS series v B series: a smaller sensor base plate facilitates mounting and connector placement on the BS series. Otherwise these are identical.
- Purging: each sensor is equipped for purging with a gas such as dry air, nitrogen or SF6.
- Power: an external power source is not required since each sensor is a passive device
Model B-15 (up to 300 K rad)
The PRODYN Model B-15 B-dot current probe was designed to measure current in an intense radiation field (up to 300 K rad). The B-15 has two identical loops with opposite polarity to allow signals to be added, thus providing common-mode rejection capability. Accuracy in manufacturing produces consistent results of better than 5%. Other body styles with different hole patterns are available.
| Equivalent Area (Aeq) | Frequency Response (3 dB Point) | Maximum Output (peak) | Output Connector | Mass | |
|---|---|---|---|---|---|
| B15 | 1.7 x 10-6 m² | > 500 MHz | > 400 V | 100 Ω Twinax (modified GR-874) | 43 g |
Model BS25 (high frequency)
The PRODYN Model BS25 is a half loop high frequency sensor. The loop area is encapsulated to provide breakdown resistance and protection from the environment.
| Equivalent Area (Aeq) | Frequency Response (3 dB Point) | Risetime (tr 10-90) | Maximum Output (peak) | Output Connector | |
|---|---|---|---|---|---|
| BS25 | 4.5 x 10-6 m² | 11 GHz | <0.032 ns | ± 500 V RMS | SMA (Male) |
MODELS BS40, BS50, BS70 & BS80
These precision high frequency multi-gap type ground plane sensors are designed to measure the time rate of change of surface current density or as a B-dot sensor. 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 sensors have a parallel-series wiring configuration that cancels the electric field induced signals and makes the sensors output signal the result of only the magnetic field.
| Equivalent Area (Aeq) | Frequency Response (3 dB Point) | Risetime (tr 10-90) | Maximum Output (peak) | Output Connector | |
|---|---|---|---|---|---|
| BS40 | 1 x 10-2 m² | > 230 MHz | < 1.5 ns | ± 5 kV | Type N Female |
| BS50 | 1 x 10-3 m² | > 700 MHz | < 0.5 ns | ± 5 kV | Type N Female |
| BS70 | 1 x 10-4 m² | > 1.8 GHz | < 0.2 ns | ± 1.5 kV | SMA Female |
| BS80 | 1 x 10-5 m² | > 5 GHz | < 0.07 ns | ± 100 V | SMA Female |
Models B30, B40, B50, B70(r) & B80(r)
PRODYN ground plane/surface current type magnetic field sensors can be used as a B-dot sensor or to measure the time rate-of-change of surface current density because the magnetic field over a conductive sheet is related to surface current density.
The sensors 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. Each 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 when used as a B-dot sensor is provided on the datasheet.
Points to Note:
- Axial v radial: sensors are available with axial or radial output.
- BS series v B series: a smaller sensor base plate facilitates mounting and connector placement on the BS series. Otherwise these are identical.
- Purging:-each sensor is equipped for purging with a gas such as dry air, nitrogen or SF6.
- Power: an external power source is not required since each sensor is a passive device
Model B-15 (up to 300 K rad)
The PRODYN Model B-15 B-dot current probe was designed to measure current in an intense radiation field (up to 300 K rad). The B-15 has two identical loops with opposite polarity to allow signals to be added, thus providing common-mode rejection capability. Accuracy in manufacturing produces consistent results of better than 5%. Other body styles with different hole patterns are available.
| B15 | |
|---|---|
| Equivalent Area (Aeq) | 1.7 x 10-6 m² |
| Frequency Response (3 dB Point) | > 500 MHz |
| Maximum Output (peak) | > 400V |
| Output Connector | 100Ω Twinax (modified GR-874) |
| Mass | 43g |
Model BS25 (high frequency)
The PRODYN Model BS25 is a half loop high frequency sensor. The loop area is encapsulated to provide breakdown resistance and protection from the environment.
| BS25 | |
|---|---|
| Equivalent Area (Aeq) | 4.5 x 10-6 m² |
| Frequency Response (3 dB Point) | 11GHz |
| Risetime (tr 10-90) | <0.032ns |
| Maximum Output (peak) | ± 500V RMS |
| Output Connector | SMA (male) |
MODELS BS40, BS50, BS70 & BS80
These precision high frequency multi-gap type ground plane sensors are designed to measure the time rate of change of surface current density or as a B-dot sensor. 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 sensors have a parallel-series wiring configuration that cancels the electric field induced signals and makes the sensors output signal the result of only the magnetic field.
| Equivalent Area (Aeq) | Frequency Response (3 dB Point) | Risetime (tr 10-90) | Maximum Output (peak) | Output Connector | Mass | |
|---|---|---|---|---|---|---|
| B30 | 1 x 10-1 m² | > 78 MHz | < 4.5 ns | ± 5 kV | 50 Ω GR-874 | 26 kg |
| B40 | 1 x 10-2 m² | > 230 MHz | < 1.5 ns | ± 5 kV | Type N Female | 4.5 kg |
| B50 | 1 x 10-3 m² | > 700 MHz | < 0.5 ns | ± 5 kV | Type N female | 2.7 kg |
| B70(R) | 1 x 10-4 m² | > 1.8 GHz | < 0.2 ns | ± 1 kV | Female SMA | 80 g |
| B80(R) | 1 x 10-5 m² | 7.5 GHz | < 0.045 ns | ± 250 V | Female SMA | 15 g |
