Exchange field noise voltage at various locations
Welcome guest, is this your first visit?
Results 1 to 1 of 1
  1. #1
    Designer of deep gold detectors. Might create a detector company

    Aug 2019
    California, U.S.
    Deep gold detectors I've designed
    8 times

    Exchange field noise voltage at various locations

    Hi, I'm new to prospecting & metal detecting, but I've designed a metal detector & built a few versions. I'm interested in exchanging field noise voltage density per m^2 (nV/√Hz/m^2) measurements at various locations? I don't have much so far, just a few locations out here in the noisy city, but hopefully within 2 to 3 months I'll take measurements at various Southern California wilderness locations. The method I'm using to measuring the noise is a low noise op-amp, LT1028A, typically set to a measured confirmed gain anywhere from about 100 to 1000, connected to a coil. For now I'm using a single turn 1 meter OD loop. The op-amp output goes to an oscilloscope that displays a voltage spectrum. If for example the scope is set to 400us/div and each FFT sample for 10 divisions is 4ms, then to get the nV/√Hz I divide the spectrum noise voltage for a given frequency by 1/sqrt(4e-3 seconds). And of course I divide that answer by the single turn coil area, m^2.

    I appreciate it! You can send a private message if you prefer.
    Last edited by Prospector Paul; Aug 05, 2019 at 12:29 PM.
    Working on new technology capable of detecting deep gold



Home | Forum | Active Topics | What's New

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Similar Threads

  1. Replies: 6
    Last Post: Jun 30, 2015, 08:32 PM
  2. Replies: 4
    Last Post: Mar 07, 2015, 01:56 PM
  3. Aquapulse voltage
    By hookahforgold in forum Shipwrecks
    Replies: 3
    Last Post: Feb 19, 2014, 07:14 AM
  4. F75 makes a funny noise (not haha funny) bad noise.
    By longislandpirate in forum Fisher Research Labs
    Replies: 3
    Last Post: Jul 31, 2011, 04:27 PM
  5. AT PRO coil exchange in the field
    By DIRTDOCTOR in forum Garrett
    Replies: 16
    Last Post: Apr 07, 2011, 10:00 PM

Tags for this Thread

Powered by vBadvanced CMPS v4.3.0