Jump to content

Half Sine Metal Detector Technology - Hybrid Induction Balance / Pulse Induction Metal Detector

Recommended Posts

I always have my ears perked up for something new in metal detectors and metal detecting technology. I confess to not being smart enough to really get deep into the technical side of it but I have a general layman's knowledge of the subject.

A couple years ago Carl Moreland, the Engineering Manager for White's Electronics, was interviewed on a radio show. I tripped over a reference to the interview on another forum and checked it out. It is very long, and near the end Carl dropped a bombshell. At least I thought so, but it went unnoticed and uncommented on in the metal detecting online world. I thought about posting it on a forum back then but decided to wait and see what developed. Here is the applicable portion of the interview:

Relic Roundup Radio Show, January 17, 2012, Interview with Carl Moreland, Engineering Manager, White’s Electronics

Transcript beginning at 50:57 mark:

Carl Moreland - “I can mention one technology that we’re working on because the patent has already been published… or the application, not the patent hasn't gone through yet. We’re working on something called half sine technology, which has actually been around since the 1960’s in geophysical prospecting applications. This is where instead of transmitting a sinusoidal signal you actually just transmit half of the sine and you can do that at extremely high voltages and high ? rates and so on. It’s technically not pulse induction but it’s not VLF either and it is a time domain method. And with that we can get really good depth and we can even get target id information and do discrimination and so forth.”

Can you see why I perked up at that? I am still amazed it did not get any notice at the time. Nothing happened for a long time. Then I got this PM from Rick Kempf recently:

Sent 29 January 2014 - 09:04 AM

Was looking for info on my new SD 2100 this AM when I sort of fell down a rabbit hole of old forum posts and emerged reading Whites new patent. About the first thing I noticed was that you were cited in "prior art".

Here's what they cited: http://www.voy.com/76600/7/475.html

The patent is here: http://www.google.com/patents/US20110316541

Is this something you knew about? Just wondering.

Rick Kempf

I told Rick, yeah, heard about that. It was the patent finally being granted from the application Carl mentions in the interview. It was fun getting a mention in a patent though I think it was just the examiner studying up on the subject and finding my old post helpful in simplifying the subject.

For a long time the Holy Grail in metal detecting has been something that combines the target identification of an Induction Balance (IB or more commonly known as VLF) detector with depth of a Pulse Induction (PI) detector. There have been many promises and false starts over the years, and that was one reason I kept the radio interview mention quiet the last couple years. Frankly, I had half forgot about it until Rick brought the patent being granted to my attention. Notice the title:

Hybrid Induction Balance/Pulse Induction Metal Detector

A new hybrid metal detector combines induction balance and pulse induction technologies. Target signals are generated from a transmitted wave that has both induction balance and pulse current inducing characteristics and uses pertinent sampling of the receive data. Combining the two data sources provides eddy current target identification while excluding ground permeability and remanence obscuration.

Is it time to sing Hallelujah? Well, there is a big gap in between getting a patent and bringing a detector to market. Many patents get filed and you never even see something directly related to the patent. Maybe it looked good on paper but does not pan out well in reality for numerous reasons. So just because White's was granted this patent does not mean something is around the corner. However, they have been working on it for over two years already obviously. And it has been some time since White's put something new out. I do not count remakes of the MXT etc as new. So I think there is reason to be hopeful we may see something one of these days.

John Earle is one of the unsung heros in the industry. He had a hand in many of the best products at Compass Electronics before moving over to White's after Compass went under. To this day I have never used a VLF that goes any deeper than my old Compass Gold Scanner Pro. John was one of the brains involved in that, as well as the White's Goldmaster 3, regarded by many as being the pinnacle of the analog development of that model line. I was fortunate to have met John at the factory some years ago. He is listed as the inventor on the new patent. Half sine technology is also mentioned in an earlier patent filed by White's, again with John listed as inventor at http://www.freepatentsonline.com/7649356.pdf

Looks like serious stuff brewing. Bruce Candy of Minelab makes mention of half sine technology in a patent application at http://patents.com/us-20130154649.html which makes me wonder about the new "Super Gold Detector" he is working on. But it is this most recent patent by White's that seems to put the finest point on it. Maybe the Holy Grail of detecting is soon to be a reality. The fact it is White's certainly gives me more hope than what we have seen in the past.

Edit May 2015 - see also White's patent for Constant Current Metal Detector

  • Like 6
Link to post
Share on other sites


I've been puzzled by the seeming quiet from White's re: new detectors, particularly on the PI front.  Was the TDI it?  Modest developments of Eric Foster's design and then nothing?  For years?  Didn't seem consistent with their history or the engineering talent they have there.  Then Garrett and Minelab introduce a series of new detectors, and still nothing.

Not being any kind of insider, or close to the industry, I'd be the last to know - but there HAD to be something going on that we'd eventually see.  Maybe something that would bast owners of older White's VLF and PI machines off their death-grip on the old machines, and justify upgrading.  At least something to compete with the inevitable new machines as their competitors leveraged their particular technical advantages.  Those kind of advances don't come along very often, but we can hope.

Good as the latest from Garret, First Texas and Minelab sound, I'm waiting to see if they have enough cost/benefit to justify an upgrade - by someone who can, e.g. find better uses for the money than a shiny new GPX 5000, however superior it may be in some situations.  I'm sure not going to jump until I see what White's has to offer this generation (or if they plan to offer anything new at all).

These patents show that they've not been idle, and give me hope that mid-range (affordable) White's detectors may be in the offing that will justify an upgrade, since their competitors haven't gotten me to jump yet.

BTW, these detectors are described in analog terms, while digital detectors have been out for a good while now.  Particularly in the PI's, digital signal processing seems to have come late.  The way to REALLY combine the best of VLF and PI (frequency and time domain) detectors is with DSP.  You see it all over in radio, with most of many modern radios being DSP.  "Software Defined Radios" they are called.  When are we going to see "Software Defined Detectors", with all the flexibility and signal processing power that implies (and all the cost savings!)?


  • Like 1
Link to post
Share on other sites

Not to raise the dead but maybe they bought some of the NEVER_QUITE_READY pulse-devil design concepts...which at the time sounded like it would be the final answer to prospectors prayers...

Sooner or later someone will make these technologies work in the real world...I hope I can still swing a detector when that happens.


Link to post
Share on other sites

I hope this does lead to something new, but I just cant get excited by vague rumors anymore all too often nothing comes of it. When things are more imminent and substantial, I'll get a lot more interested. Good to keep an eye on things in the meantime though.

  • Like 2
Link to post
Share on other sites
  • 1 year later...

Well, we finally know what it is that Minelab was working on, and ZVT is not half sine technology. Rumor (sorry Chris) has it a new White's hybrid may be seen by year end? (Edit - note this post was in 2015) We will see.

Can you imagine having a PI that discriminated like a VLF? How much is something like that worth to people? Another 10K detector? I would be first in line.

  • Like 4
Link to post
Share on other sites

I would be second in line. As the years roll by my trash threshold gets smaller.

  • Like 1
Link to post
Share on other sites

Cmon! Is detecting only going to be a hobby for the rich, or bachelors? Hopefully its way less than that, or you can count alot of us out.

  • Like 2
Link to post
Share on other sites

Ray, I made the 10K thing up to illustrate the point of such a detector being desirable. I have no idea when or if such a detector will appear, or what it will cost.

On the other hand if I could get my hands on a PI that discriminated to full depth for 10K I estimate I could pay for it with gold found in less than two weeks at several locations I know of.

  • Like 1
Link to post
Share on other sites
  • 10 months later...

I have been keeping this patent and White's Constant Current patent in the back of my mind for two years now. It seems with White's on the move once again something may possibly see the light of day eventually. Or not. In any case I decided it was time to revive the two threads from the archives.


  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Similar Content

    • By Nik11
      We all have seen many videos comparing  metal detectors , changing the coils, frequencies and all kind of settings so they can maximize the capabilities of the "machines"! 
      But what about the same machines abilities to detect larger targets like a 20x20 cm or 40x30cm  on greater depths?? 
      Am in the only one Qurious about it 🤪 
       Have someone seen something about it?? 
    • By Goldseeker5000
      Just letting everyone overseas in Australia, New Zealand, Tasmania,Canada and everywhere else outside of the states know that I got the shipping rates corrected  for The Nugget Shooter's Field Guide, and reduced. Even the rates for ordering in quantity is way less.
    • By mn90403
      Have you modded a detector or a coil over the years to make it perform better than the manufacturer intended?  Did you get good results?  I just did a search on this forum and found 168 hits for modded.  What is your favorite mod?
    • By VicR
      Minelab has just applied for an Australian Design Patent for a "Tray".
      Anyone have any ideas what this would be?
    • By Rick N. MI
      Anfibio is rated waterproof to 16'. Tarsacci is rated to 30 min underwater.
      Both ip68 why the difference.
      I can't find what the Equinox rating is.
    • By Steve Herschbach
      I have got up on my soapbox every year about this time to prognosticate about the coming year in metal detector technology. 2020 was an especially significant year as we lost another major player in the industry. A few years ago it was Tesoro going out of business. In 2020 we learned that White's is closing shop and being acquired by Garrett. It is unknown if Garrett will attempt to keep White's alive as a separate product line, or simply acquired the rights and technology to keep somebody else from doing so. At the moment it seems White's has gone away for good, but it is not impossible Garrett will revive the name in 2021. Whatever they decide will have a major influence on metal detecting in the future. But in the meantime we have fewer players now to speculate about.
      Garrett/White's - we just saw the release of the Ace Apex, a first foray into multifrequency by Garrett. The company already has a very well implemented wireless audio system, and the Apex is fully rechargeable. The White's acquisition means Garrett adds the V3i multi tech and TDI PI tech to their IP base, and this along with the half-sine patent means Garrett has a fresh shot of technology options to choose from. The White’s 24K is a superb product, now unavailable new. However, I expect an acquisition of this magnitude to take time and I'm not holding my breath on any really new product in 2021 from Garrett. At most perhaps a revival of some White's models, or releasing clones under the Garrett name. At the moment however I see Garrett as the U.S. company with the most potential for the longer term future, regardless of what happens in the near term.
      First Texas (Bounty Hunter, Fisher, Teknetics) - whereas Garrett seems to have a purpose, First Texas seems adrift these days. Most of the Fisher models on the website have been discontinued, or are decades old. Teknetics as a brand seems nearly dead, focused on factory direct sales. Basic advances like in-built rechargeable battery systems, wireless headphones, and over the internet updates - all go ignored at the company. The only news is a new line of pulse induction detectors, but as the lack of interest from users on the internet shows, most people are not screaming for First Texas to bring a PI to market. Everyone wants to hear about a major response to new machines like the Equinox, but so far it's crickets from First Texas.
      The final production Impulse AQ will hit the market in the first half of the year, but I expect it to have almost no impact on the overall detecting world, or even the beach detecting world for that matter. People will still choose VLF over PI for beach detecting by huge margins, so the Impulse AQ has a shot at being nothing more than a niche detector in a niche detecting market. The Gold version has potential to crack open the gold prospecting market that Minelab currently dominates, but it is going to have to have a very attractive price/performance ratio if it hopes to make Minelab users consider a new brand. For many gold prospectors Minelab currently is the only choice in detectors.
      Hopefully there is more going on at First Texas than PI, because they are sliding into irrelevance in high end VLF. It seems more models keep slipping into the Bounty Hunter lineup, and if nothing changes someday the Teknetics and even Fisher lines may be retired. Or the Fisher line could be boosted with new high end machines to become the high tech alternative to Bounty Hunter. That was the original plan buying this old name in detecting, and 2021 will probably determine what happens for the Fisher brand in the future. Revival... or the next slow death?
      Minelab - on a roll still, with the new GPX 6000 due out this spring. When it comes to cutting edge technology, Minelab remains the company to watch. There is no doubt a replacement for the CTX 3030 in the works, but there are no solid hints at when it may arrive. I am guessing 2022 since the last two rollouts were for coin detectors (Equinox and Vanquish). Minelab tends to address areas in a round robin fashion, and I believe 2021 will preferentially freshen the gold prospecting lineup.
      Nokta/Makro - the easy picking low hanging fruit of single frequency VLF has been fully exploited at Nokta/Makro, and it remains now to see if they can make the move up to higher tech product like simultaneous multifrequency and ground balancing pulse induction. The rapid pace of new product releases has stalled out as further advances will be more difficult. Historically NM has used their Christmas card to hint at new releases, and this year they took a pass on that. I'm hopeful for 2021 but certainly not holding my breath, as it may be fall at earliest before we hear more.
      Tarsacci - a new 12" coil for the MDT is in the works, and a possible change to the battery door design in future versions.
      XP - still largely a one-trick pony with the DEUS, and the ORX, which is really just a subset of the DEUS. Will we ever see multifrequency or PI from XP? All is quiet now with the news over ORX run it's course, and right now there are no hints of anything new from XP for 2021.
      Just random blatherings from an industry old-timer, worth every penny paid.  I'm pretty well set for detectors these days, with only the grudge match between the Minelab GPX 6000 and Fisher Impulse Gold having any interest for me personally. I have to put my money on Minelab when it comes to cutting edge tech, but I do hope the Impulse Gold is good enough and low priced enough to shake things up.

  • Create New...