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HSD
 SENSORS The HSD (Hollow
Spherical Dipole) Sensors are mounted on a conducting surface
and used to measure the time rate-of-change of surface charge
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They are identical to the standard HSD D-dot ground plate sensors
with the exception of shorter baseplates, which facilitates mounting
on curved surfaces. The proximity of the output connector makes
them slightly less accurate than the standard models for D-dot
measurements. These sensors are passive devices and require no
power. Fittings are provided to fill the interior of the sensor
with a high dielectric strength gas, such as N2 or
SF6, for use in high field regions where internal arcing
could become a problem.