Treasure Hunting & Metal Detecting Community

Welcome, Guest! Please login or register HERE - It is FREE and easy. Only registered users can post and view images on our message boards. Did you miss your activation email?
Login with email, password and session length Caps lock is activated.		Or Login Using Social Network Account

News:

It appears you have not registered with our community yet. Guests can not uses all functions of the forum. They can not post, view attachements or access our download areas etc. To register please click here ...

Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > VLF Designs (Moderator: Eugene52) >

Phase Wrap: What do YOU call it?

Question:

Phase Wrap: What do YOU call it?

Iron Wrap 0 (0%)

Iron Wrap Around 0 (0%)

Iron Wrap Around Effect 0 (0%)

Phase Wrap 0 (0%)

Phase Wrapping 0 (0%)

Phase Wrap Around 0 (0%)

Phase Wrap Around Effect 0 (0%)

Wrap Around 0 (0%)

Wrap Effect 0 (0%)

Wrap Around Effect 0 (0%)

Total Voters: 0

Pages: 1 2 Go Down

← previous next →

Tags:

0 Members and 1 Guest are viewing this topic.

Eddy Current Topic starter

Pull Tab

Join Date: Mar, 2012

Activity

Posts: 15
Referrals: 0

40.00 Gold
View Inventory

	Phase Wrap: What do YOU call it? « on: April 28, 2012, 05:47:37 pm »

Hi all,

you know the situation when the TID on a VLF bounces
between Iron and Silver, because of phase wrapping...

I was wondering what you call this effect?

Please vote in the above poll, and if you have any other
name for this phenomenon, please feel free to post it...

Happy Hunting
Eddy

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221640.html#msg221640


	Logged

Minelab E-TRAC | Garrett PRO-POINTER | Black ADA Invader
Member of the Task Force for Metal Detecting Rights

Homefire

Global Moderator
Platin Member

Join Date: Jan, 2009

662

Activity

Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #1 on: April 28, 2012, 06:13:22 pm »

Are you talking about Iron Masking?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221642.html#msg221642


	Logged

GoldDigger1950

The Old Man and the Soil
Global Moderator
Platin Member

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009

225

Activity

Posts: 11219
Referrals: 12

47848.00 Gold
View Inventory

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors

	Re: Phase Wrap: What do YOU call it? « Reply #2 on: April 29, 2012, 12:35:57 am »

Sorry. I have never heard of such a thing and I've been an engineer for decades.

Are you thinking of the phenomenon of a discrimination circuit where you have both notch and bandpass filtering in a programmable unit?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221689.html#msg221689


	Logged

It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.

Let's Talk Treasure!

Eddy Current Topic starter

Pull Tab

Join Date: Mar, 2012

Activity

Posts: 15
Referrals: 0

40.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #3 on: April 30, 2012, 11:08:44 am »

cheers for your replies guys Cool

much appreciated...

no, I don't mean Iron Masking. I'm talking about the effect caused by highly corroded iron targets.

Such targets can cause different signals due to Iron bleed/leach (Halo Effect), but these terms describe what causes the phenomenon, rather than them being a label for the technical bit happening in the discrimination circuit due to these causes.

What I mean is, what is it called when the phase shift happens to exceed -TT or +TT ?

HH Eddy

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221895.html#msg221895


	Logged

Minelab E-TRAC | Garrett PRO-POINTER | Black ADA Invader
Member of the Task Force for Metal Detecting Rights

Homefire

Global Moderator
Platin Member

Join Date: Jan, 2009

662

Activity

Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #4 on: April 30, 2012, 11:12:29 am »

Haloe Effect!

Some good info on it here:

You are not allowed to view links.
Please Register or Login

http://www.njminerals.org/metaldetecting-haloeffect.html

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221897.html#msg221897


	Logged

Eddy Current Topic starter

Pull Tab

Join Date: Mar, 2012

Activity

Posts: 15
Referrals: 0

40.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #5 on: April 30, 2012, 11:36:10 am »

cheers homefire...

I already know about the Halo Effect, what I'm actually looking for is the name for the
technical bit happening in the discrimination circuit because of the Halo Effect...

thanks for the link anyway Cool

HH Eddy

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221909.html#msg221909


	Logged

Minelab E-TRAC | Garrett PRO-POINTER | Black ADA Invader
Member of the Task Force for Metal Detecting Rights

Homefire

Global Moderator
Platin Member

Join Date: Jan, 2009

662

Activity

Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #6 on: April 30, 2012, 11:39:46 am »

Halo can cause Phase Shift, it that the word your looking for?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221911.html#msg221911


	Logged

Eddy Current Topic starter

Pull Tab

Join Date: Mar, 2012

Activity

Posts: 15
Referrals: 0

40.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #7 on: April 30, 2012, 12:00:36 pm »

yes, I know.. but no, phase shift is not the term I'm looking for.

what I am looking for is the name for when the phase shift is more than one
wavelength, in other words, when the phase shift kind of overtakes itself...

HH Eddy

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221919.html#msg221919


	Logged

Minelab E-TRAC | Garrett PRO-POINTER | Black ADA Invader
Member of the Task Force for Metal Detecting Rights

Homefire

Global Moderator
Platin Member

Join Date: Jan, 2009

662

Activity

Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #8 on: April 30, 2012, 12:07:41 pm »

Got me on that one. Usually that sort of thing would be seen as a Overload by the detection circuits. The Detector would Howl like a Banchie! Cool

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221922.html#msg221922


	Logged

Eddy Current Topic starter

Pull Tab

Join Date: Mar, 2012

Activity

Posts: 15
Referrals: 0

40.00 Gold
View Inventory

	Re: Phase Wrap: What do YOU call it? « Reply #9 on: April 30, 2012, 12:32:51 pm »

nothing should overload when this happens.. all it means for the
machine, is that it can't make it's mind up between two targets.

We often see this happening, but usually the target ID numbers
are right adjacent to each other when it happens.

In the case of a phase wrap, however, the machine shows that
the target ID numbers are at opposite ends of the meter.

a bit confusing Cheesy

I know...

HH Eddy

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,36189.msg221928.html#msg221928


	Logged

Minelab E-TRAC | Garrett PRO-POINTER | Black ADA Invader
Member of the Task Force for Metal Detecting Rights

Pages: 1 2 Go Up

← previous next →

Jump to: