Is is possible to set up a relatively precise standing EM wave on a conductive bar(see below for how precise)?
I am thinking that it could be used to measure the length of such things since L = c/f. Of course this assumes knowing c in the material and the frequency to get an accurate result but I'm just curious as to if it is even possible to do such a thing?
Sounds like it would be very similar to antenna's but here I'm trying to get an accurate result. Maybe simply sweeping the frequency range and finding the resonant peak treating the bar as an antenna would work?
Just looking for some ideas on it as I've been pondering lately how to measure things accurately and this was one idea I was thinking about.
Another similar idea which probably won't work would be to setup a high frequency EM wave on the conductive bar and measure the EM field along the bar counting the peaks. (essentially the intensity plots out a ruler on the bar) Unfortunately for decent resolution one needs to use too high of a frequency. (to get even mm resolution one around a frequency of 100 GHz)
Maybe one could send a pulse like radar/sonar or something and measure the time delay?
Thanks, Jon