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A low noise microprocessor controlled internally digitizing rotating

Jun 5 2006 rotating vane electric field mill for airborne platforms A brushless DC motor is used to drive the rotor to avoid the high level of wideband Having a record of mill operating parameters such as motor speed instrument temperature motor Figure 4 Shown is a block diagram of the field mill circuitry 16

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Patent US5315232 Electric field measuring system Google Patents

May 24 1994 Motor speed is controlled to minimize effects of external noise A system for measuring and recording DC electric field data at multiple locations using field mill circuits control sensor motor rotor speed and the signals generated for A time code translator providing the means of synchronizing electric

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