I would like to measure the electric field in the vicinity of an object of interest. I would like to have decent spatial resolution (i.e. be able to pinpoint a measurement to a point in space within an inch or so). The electric field might be (time) constant, or it might be changing slowly (up to several kHz). If the same piece of equipment can't handle both, I will be completely satisfied if it is able to measure constant field. It doesn't have to be too sensitive - the fields I expect are on the order of kV/m. I've been searching the internet for a piece of equipment to do this, but without much luck. Here are a few things I found:
- I found this straightforward application in a book but I can't seem to find any equipment employing this idea.
- I could use a sensitive electrometer to measure induced charge on an antenna, which should be proportional to the electric field. I'm not sure how well it will cope with changing field.
- An electric field mill, which is a similar idea to the electrometer, but the ones I saw were quite bulky, intended for atmospheric measurements.
What would you recommend?