We (as an industry) have repurposed this technology for what's called Electromagnetic Measurement While Drilling telemetry. We break modern drill strings with a "gap sub", which is basically just a piece of iron with a ceramic insulated thread, into a "crappy dipole" which then if we impart 2-30W of power through roughly a Class D amp we can generate a signal that goes through most formations of the earth to the surface from over 5 miles underground from the transmitting source. Transmit frequencies are generally 2-10hz, sometimes pushing 32+hz. It's a fascinating use of the tech. If building in this industry sounds awesome to you, feel free to drop me a line. ken _at_ erdosmiller _dot_ com.
Comments
We (as an industry) have repurposed this technology for what's called Electromagnetic Measurement While Drilling telemetry. We break modern drill strings with a "gap sub", which is basically just a piece of iron with a ceramic insulated thread, into a "crappy dipole" which then if we impart 2-30W of power through roughly a Class D amp we can generate a signal that goes through most formations of the earth to the surface from over 5 miles underground from the transmitting source. Transmit frequencies are generally 2-10hz, sometimes pushing 32+hz. It's a fascinating use of the tech. If building in this industry sounds awesome to you, feel free to drop me a line. ken _at_ erdosmiller _dot_ com.
This stuff sounds super interesting, it’d be great if you could link to any literature that might explain more.
You can check out our podcast, it goes over a lot of the basics. https://www.erdosmiller.com/podcast