Barely an individual hasn’t experienced the abrupt, sharp discharge of fixed electricity, especially on a crisp winter’s day. It usually requires a touch, though, the traditional example being a trigger from finger to doorknob after scuffing throughout the carpet. However how would one determine the electrostatic charge of an object without touching it? Something like this field mill, which can determining electrostatic charge over a range of numerous meters, will suffice.
We confess to not having become aware of field mills previously, and discovered [Leo Fernekes] video recording his construct to be really instructive. Field mills have applications in meteorology, being utilized to measure the electrostatic state of the environment from the ground. They have actually also contributed in lots of a scrubbing of rocket launches, to prevent the rocket from getting zapped during launch.
[Leo]’s mill works just like the industrial units: a grounded shutter rotates in front of two disc-shaped electrodes, regulating the capacitance of the system relative to the outdoors world. The 2 electrodes are fed into a series of transimpedance amplifiers, which boost the Air Conditioning signal originating from them. A Hall sensor on the shutter permits tasting of the signal to be synchronized to the rotation of the shutter; this not just generates the interrupts needed to sample the sine wave output of the amplifier at its peaks and troughs, but it also determines whether the electrostatic field is favorable or unfavorable. Have a look at the video listed below for an excellent explanation and a good looking construct with a junk-bin ambiance to it.
Meteorological uses aside, we ‘d enjoy to see this turned toward any of the lots of Tesla coil builds we have actually seen. From the tiny to the unreasonable, this field mill must have the ability to quickly measure any Tesla coil’s output with ease.