Something like this ? https://de.wikipedia.org/wiki/Elektrofeldmeter
(German wikipedia as the english entry is less than stellar. They are
called field mill.)
Best regards
Hendrik
On 16.03.2018 19:53, ed breya wrote:
There is another kind of static electric field meter that was commonly
used over the past few decades for monitoring charges/voltages in work
areas dealing with sensitive semiconductors. It has a small motor
spinning a hollow brass cylinder that has a radial hole or slot that
alternately shields and exposes a center cylinder inside, which is the
pickup electrode. This action causes a small AC signal on the
electrode, that can be amplified up to represent the electric field
strength from any nearby object. The signal is then rectified and
trips a comparator and LED indicator if the level exceeds a certain
amount.
I have a couple of these units, but have never experimented with them
yet. They don't show any kind of readout or provide a measuring signal
- just the LED warning of excessive (unknown trip point) static charge
nearby. I figured someday I would modify one up and add a signal
output port and a sync output from the motor, allowing a lock-in
analyzer to read the result over a wide range, and maybe even be
fairly accurate or calibrate-able.
Ed
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