Ground Plane/Surface Current Type Magnetic Field (B-Dot) Sensors

Ground Plane/Surface Current Type Magnetic Field (B-Dot) Sensors

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.

Prodyn B15 free-field magnetic field sensor

 B15
Equivalent Area (Aeq)1.7 x 10-6 m2
Frequency Response (3 dB Point)> 500 MHz
Maximum Output (peak)> 400V
Output Connector100 ohm Twinax (modified GR-874)
Mass43g

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.

Prodyn BS25 ground plane magnetic field sensor

 

 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 ConnectorSMA (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.

Prodyn BS40-BS80 B-Dot magnetic field sensors

 BS40BS50BS70BS80
Equivalent Area (Aeq) 1 x 10-2 m21 x 10-3 m21 x 10-4 m21 x 10-5 m2
Frequency Response (3 dB Point) >230MHz>700MHz>1.8GHz>5GHz
Risetime (tr 10-90) <1.5ns<0.5ns<0.2ns<0.07ns
Maximum Output (peak)± 5kV± 5kV± 1.5kV± 100V
Output Connector 50ohms GR-87450ohms GR-874SMA femaleSSMA 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.

Prodyn B15 free-field magnetic field sensor

Edit
B15
Equivalent Area (Aeq) 1.7 x 10-6 m2
Frequency Response (3 dB Point) > 500 MHz
Maximum Output (peak) > 400V
Output Connector 100 ohm 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.

Prodyn BS25 ground plane magnetic field sensor

Edit
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.

Prodyn B30-B80R B-Dot magnetic field sensors

 B30B40B50B70(R )B80(R )
Equivalent Area (Aeq)1 x 10-1 m21 x 10-2 m21 x 10-3 m21 x 10-4 m21 x 10-5 m2
Frequency Response (3 dB Point)>78MHz>230MHz>700MHz>1.8GHz7.5GHz
Risetime (tr 10-90)<4.5ns<1.5ns<0.5ns<0.2ns<0.045ns
Maximum Output (peak)± 5kV± 5kV± 5kV± 1kV± 100V
Output Connector50ohm GR-874type N femaletype N femalefemale SMAfemale SMA
Mass26kG4.5Kg2.7Kg80g15g

 

Datasheets

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Prodyn B-15 Magnetic Field Sensor Datasheet

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Prodyn B-S25 Magnetic Field Sensor Datasheet

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Prodyn Magnetic Field Sensor Datasheet BS40-BS50-BS70-BS80

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Prodyn B30-B40-B50-B70-B80 Magnetic Field Sensor Datasheet