northwest Some useful info for coil makers
Welcome, Guest. Please login or register.
Friday September 20 2019 11:44:26 AEST AM
Home Help Login Register
News: Welcome to the Australianelectronicgoldprospectingforum founded in July 2010, an add free totally independent forum with over 70 boards and paid for and managed by the Admin.Topics: 9,245  Total forum Posts:46,357 Members:842. Total page views:12,263,130  Admin and  forum and domain name owner :marjen at optusnet.com.au. Guests can only see a limited number of boards at present and cannot see any hot links. Guests cannot post and never will be permitted too!Registration of new members must be approved by admin.
 All  original Photos and posts and  original materials displayed on this site are COPYRIGHTED and remain the property of the poster and the  Austalian electronicgoldprospectingforum.com. All messages on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner and neither the owner of this forum and its domain name nor SMF or the forum software developers or the forum host shall be held responsible for the content of any message. Admin reserves the right to remove any offensive or objectionable posts. No defamatory material or politics/religion or issues of race will be permitted.
QED news
QED on facebook
link-https://www.facebook.com/groups/245308699667153/403446933853328/?comment_id=403472030517485&reply_comment_id=403476793850342&notif_id=1562580344994993&notif_t=group_comment
Interfacion Pty Ltd is pleased to announce that the QED PI Detector has been modified to allow the use of DD (double D) coils. This change involves a simple change to the electronics within the control box.
The firmware has also been upgraded to include a further improved Ground Balance.
All detectors being delivered to new customers from Monday 5th August 2019 will already have the above upgrades included.
As a show of commitment to all QED owners, the hardware modification to allow use of the DD and CC coils will be provided at no cost.
Of course and as per the QED warranty, the firmware update is provided free of charge, except for P&H.
Any QED owner who plans to attend the Laanecoorie Bash is encouraged to bring their detector along and have it upgraded at no cost.
Standard postage and handling arrangements apply to other owners. Send via Australia Post the box (minus batteries) along with a pre-paid, pre-addressed bag/box to:
Interfacion Pty Ltd
PO Box 106R
Redan VIC 3350
Howard Rockey
Director Interfacion Pty Ltd.

australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: Some useful info for coil makers 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: Some useful info for coil makers  (Read 148 times)
Doug
Administrator
Revered Supreme Hero Member
*******
Online Online

Posts: 16795



« on: Monday January 28 2019 15:12:36 AEDT PM »

A High-Performance Portable Transient Electro-Magnetic Sensor for Unexploded Ordnance Detection
HaofengWang 1, Shudong Chen 1, Shuang Zhang 1,*, Zhiwen Yuan 2, Haiyang Zhang 2,
Dong Fang 2 and Jun Zhu 2,*
1 College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;
   (H.W.);    (S.C.)
2 Science and Technology on Near-Surface Detection Laboratory, Wuxi 214035, China;
   (Z.Y.);    (H.Z.);    (D.F.)
* Correspondence:    (S.Z.);    (J.Z.); Tel.: +86-510-6875-2529 (J.Z.)
Received: 1 October 2017; Accepted: 14 November 2017; Published: 17 November 2017

Abstract: Portable transient electromagnetic (TEM) systems can be well adapted to various terrains,
including mountainous, woodland, and other complex terrains. They are widely used for the
detection of unexploded ordnance (UXO). As the core component of the portable TEM system, the
sensor is constructed with a transmitting coil and a receiving coil. Based on the primary field of the
transmitting coil and internal noise of the receiving coil, the design and testing of such a sensor is
described in detail. Results indicate that the primary field of the transmitting coil depends on the
diameter, mass, and power of the coil. A higher mass–power product and a larger diameter causes
a stronger primary field. Reducing the number of turns and increasing the clamp voltage reduces
the switch-off time of the transmitting current effectively. Increasing the cross-section of the wire
reduces the power consumption, but greatly increases the coil’s weight. The study of the receiving
coil shows that the internal noise of the sensor is dominated by the thermal noise of the damping
resistor. Reducing the bandwidth of the system and increasing the size of the coil reduces the internal
noise effectively. The cross-sectional area and the distance between the sections of the coil have little
effect on the internal noise. A less damped state can effectively reduce signal distortion. Finally,
a portable TEM sensor with both a transmitting coil (constructed with a diameter, number of turns,
and transmitting current of 0.5 m, 30, and 5 A, respectively) and a receiving coil (constructed with a
length and resonant frequency of 5.6 cm and 50 kHz, respectively) was built. The agreement between
experimental and calculated results confirms the theory used in the sensor design. The responses of
an 82 mm mortar shell at different distances were measured and inverted by the differential evolution
(DE) algorithm to verify system performance. Results show that the sensor designed in this study can
not only detect the 82 mm mortar shell within 1.2 m effectively but also locate the target precisely.
  
doug smile




Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin.
When is 1halfgram4three (a proven forum hacker and  village idiot!) going to stop telling lies on his “forum”?
Pages: [1] Go Up Print 
australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: Some useful info for coil makers « previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2006-2009, Simple Machines
Simple Audio Video Embedder

BisdakworldClassic design by JV PACO-IN
Valid XHTML 1.0! Valid CSS!