[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
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
Or Login Using Social Network Account
News:
Pages:  1 2   Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 1 Guest are viewing this topic.
Offline AK48Topic starter
Copper Member
*

Mood:Curious
Curious

Join Date: Jan, 2013
Thank you0

Activity
18%
Male
Algeria
Posts: 89
Referrals: 0

610.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Chrome 60.0.3112.90
Chrome 60.0.3112.90

Awards

garret 2500 GTI + SMPI +XP DEUS +NEXUS STANDARD MkII
« on: August 12, 2017, 06:37:12 am »
Go Up Go Down

hello , a little question on magnetic field , can we shape the magnetic field of a coil by diversifying the form of the coil ? thank yoou
AK48

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320141.html#msg320141


AK48


Logged
Offline homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you498

Activity
100%
Male
United States
Posts: 15092
Referrals: 0

48400.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards
« Reply #1 on: August 12, 2017, 06:57:08 am »
Go Up Go Down

   Yes, Coil Shape and geometry does effect the magnetic fields, shape, density and direction.  Just as a Antenna's geometry can effect RF magnetic radiation .

Do a gOOgle and tons of information come up.


Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320143.html#msg320143




« Last Edit: August 12, 2017, 07:38:15 am by homefire »
Logged
Offline AK48Topic starter
Copper Member
*

Mood:Curious
Curious

Join Date: Jan, 2013
Thank you0

Activity
18%
Male
Algeria
Posts: 89
Referrals: 0

610.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Chrome 60.0.3112.90
Chrome 60.0.3112.90

Awards

garret 2500 GTI + SMPI +XP DEUS +NEXUS STANDARD MkII
« Reply #2 on: August 12, 2017, 01:13:02 pm »
Go Up Go Down

hello and thank you , i was afraid it was no possible .

Posted on: August 12, 2017, 01:07:26 pm
hello ! anothet question , can you show me sketch of magnetic field of vlf and p.i  please .

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320145.html#msg320145


AK48


Logged
Offline 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
Thank you160

Activity
34%
Male
United States
Posts: 10990
Referrals: 12

46893.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards

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
« Reply #3 on: August 12, 2017, 02:25:45 pm »
Go Up Go Down

Your best option is to develop your own Smith Charts. You can search here in the search block at the top right corner and find a description of a probe you can use with your sound card that can help you to read your fields. The Smith Chart can be found using Google. Each coil you make can then be tested to show your field on the chart.

You can also download this:

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

http://www.thunting.com/smf/index.php?action=downloads;sa=view;down=97


Or read this topic:

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

http://www.thunting.com/smf/metal_detectors/transmit_coils_testing_procedures-t18215.0.html;highlight=




Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320148.html#msg320148




« Last Edit: August 12, 2017, 02:35:55 pm by GoldDigger1950 »
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!

Offline Carl-NC
Bronze Member
*

Join Date: Jul, 2006
Thank you1

Activity
1%

United States
Posts: 123
Referrals: 0

683.00 Gold
View Inventory
Windows NT 6.3
Windows NT 6.3
Firefox 55.0
Firefox 55.0

WWW Awards

~175 models
« Reply #4 on: August 12, 2017, 03:20:48 pm »
Go Up Go Down

Quote:Posted by AK48
hello , a little question on magnetic field , can we shape the magnetic field of a coil by diversifying the form of the coil ? thank yoou
AK48


The short answer is, not easily. A detector coil is not an antenna in the classical sense, it is a transformer. It operates in the near-field, not the far-field, so everything you read about antenna design and patterns does NOT apply to detector coils. There are ways to design near-field coils that are better "focused" or less bi-directional but those designs are invariably hard to build and unstable; slightest bumps will cause falsing.

The magnetic field pattern depends on the coil, not whether it's connected to a VLF or PI transmitter. BTW, Smith charts have nothing to do with plotting magnetic fields; they are used for plotting complex impedance and solving impedance matching problems.


Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320151.html#msg320151




Logged
Offline homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you498

Activity
100%
Male
United States
Posts: 15092
Referrals: 0

48400.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards
« Reply #5 on: August 12, 2017, 04:44:16 pm »
Go Up Go Down

  Carl-NC said "It operates in the near-field, not the far-field, so everything you read about antenna design and patterns does NOT apply to detector coils."   Ah but like  you can shape a RF Radiation Lobe With Antenna Geometry, you can affect the shape the Magnetic Field with the Coil Geometry as well.  


Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320155.html#msg320155




« Last Edit: August 12, 2017, 04:51:43 pm by homefire »
Logged
Offline AK48Topic starter
Copper Member
*

Mood:Curious
Curious

Join Date: Jan, 2013
Thank you0

Activity
18%
Male
Algeria
Posts: 89
Referrals: 0

610.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Chrome 60.0.3112.90
Chrome 60.0.3112.90

Awards

garret 2500 GTI + SMPI +XP DEUS +NEXUS STANDARD MkII
« Reply #6 on: August 12, 2017, 05:18:32 pm »
Go Up Go Down

hello , i understand very well what do you explain me and i'm gonna read and test , thank you very much for this new lesson , tonight , i'm gonna sleep clever than yesterday , thanks again , nice from you .
AK48

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320159.html#msg320159


AK48


Logged
Offline toranarod
Pull Tab
*

Mood:Happy
Happy

Join Date: Jun, 2017
Thank you0

Activity
3%
Male
Australia
Posts: 15
Referrals: 0

60.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Chrome 60.0.3112.101
Chrome 60.0.3112.101

Awards

GARRETT ATX.  2 x Minelabs SDC2300
« Reply #7 on: August 25, 2017, 11:48:14 am »
Go Up Go Down

Quote:Posted by AK48
hello , a little question on magnetic field , can we shape the magnetic field of a coil by diversifying the form of the coil ? thank yoou
AK48

Coils shape magnetic fields I worked on and with CRT TV remember the defection yoke on the back of an old style TV. That coil was responsible for dragging the electron been across the phosphor of the tube to generate the scan lines. And there were also focusing coils as well. How precise was that in controlling a magnetic field   
My problem is i have to many hobbies. And one of them is coils.
I get where you are coming from good thinking.
There is one design or concept I am transfixed on is the vortex coil. Generate a magnetic field like a smoke ring, think of it like this. A smoke ring can travel across a room a great distance.  But you can only blow out the candles on your birthday cake if you are very close. Look up the design of the primary coil on Tesla coil.       


Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320238.html#msg320238




Logged
Offline nickel_n
Mod
Gold Member
*****

Join Date: Jan, 2009
Thank you177

Activity
73%
Male
Australia
Posts: 2209
Referrals: 0

9485.00 Gold
View Inventory
Windows XP
Windows XP
Firefox 54.0
Firefox 54.0

Awards

MXT All Pro,EagleSL,Spectrum,XLT,DFX.Garrett Seahunter markII,SD2000,GT16000
« Reply #8 on: August 25, 2017, 02:58:40 pm »
Go Up Go Down

Magnetic field is the new buzz word.
look at the new ML patent

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

https://www.google.com/patents/US20160041292

Abstract
A method for detecting a target in a soil using a metal detector, including: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; processing the receive signal for producing a set of data which has effects of signals from the soil reduced therein or removed therefrom; producing at least two components of a form of at least one time constant spectrum based on the set of data; and producing, at least one indicator output signal based on the at least two components for indicating the presence and/or identity of the target when the target is within, an influence of the transmit magnetic field.



Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320240.html#msg320240




Logged

The Diggers Oath
We swear by the Southern Cross to stand by each other and fight to defend our rights and liberties.

Offline homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you498

Activity
100%
Male
United States
Posts: 15092
Referrals: 0

48400.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 55.0
Firefox 55.0

Awards
« Reply #9 on: August 25, 2017, 04:16:02 pm »
Go Up Go Down

Dang Minelab uses $4.00 words in that thing!    Shocked

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65589.msg320243.html#msg320243




Logged
Print
Pages:  1 2   Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com