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HSD D-DOT SENSORS (GROUND PLANE)

These HSD (Hollow Spherical Dipole) sensors are mounted on a conducting surface and used to measure the normal component of the displacement current (dD/dt).  They are used to measure the electric field ( ) in numerous EMP simulators such as ALECS and ARES.  The HSD can also be used to measure the time rate of change of surface charge density, qs.  (Data sheet 1117 describes special qs, sensors).

These sensors are available in radial and axial configurations with the output connector exiting through the mounting surface in the axial version.  The sensor is a passive device and requires no power.  Fittings are provided to fill the sensor interior with high dielectric strength gas, such as nitrogen or SF6, in high field applications where internal arcing could become a problem.

PERTINENT EQUATION
 
or  
 
where  
  Io = sensor output (in amps)
  Vo = Sensor output (in volts)
  R = sensor characteristic load impedance (50 ohms)
  Aeq = sensor equivalent area (in m2)
  D = magnitude of electric displacement vector ( )
  = angle between E and vector normal to sensor ground plate

Data Specification Sheet

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