VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, [7], 8, 9 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 16:21:50 07/20/02 Sat
Author: Ralph
Subject: Re: Magnetic Anomalies and Iron Descrimination
In reply to: Steve 's message, "Magnetic Anomalies and Iron Descrimination" on 20:13:03 07/18/02 Thu

Hi Steve,

Several years ago, Eric Foster and I talked about the possibility of developing a VLF-induction balance OR pulse induction machine with the addition of a small flux magnetometer sensor in the center of the coil. Since a magnetometer detects only ferrous metals by their self-generated magnetic field, with such a device you could determine iron at the flip of a switch.

The only consistent and accurate alternative at this time is a good VLF with full-range discrimination circuits to eliminate iron signals. With practice though, you should be able to eliminate 90 percent of iron signals with a simple iron-ID circuit. Remember that most iron objects that are any shape other than round will eventually take on polarization characteristics after being in the ground for any length of time. So sweep your coil across any suspect iron target at the usual right angle (left to right), and then ALSO at a 90 degree angle and 45 degree angle to your first sweep. If the iron has taken on any polarization, you will get a weak to very distinct double bleep in the signal response.

Another trick for identifying large iron is to use a simple directional compass. Using a small piece of wood molding or a 1/2 x 1 inch strip of wood, lay the wood across the center of the signal point, and then slide the compass across the wood in two or three directions. If the large target is iron, the compass needle will deflect off to one side or the other. Same basic principle as the flux magnetometer works from........

Ralph

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[ Contact Forum Admin ]

Forum timezone: GMT-6
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.