Joel,
can you please expand on that ("the gradient of the total field is not the
same as the gradient of the field")?
A gradient is a spatial derivative, changes of a value in space. So, what
is the difference between the value "(magnetic) total field" and the value
"(magnetic) field"?
Thanks
On Thu, May 2, 2019 at 10:08 AM Jansen, Joel via SEGMIN <
[email protected]> wrote:
> Peter has brought up a good point: that the gradient of the total field
> is not the same as the gradient of the field. The former can be collected
> with proton or Cs/K-vapour magnetometers, while the latter requires
> fluxgates or SQUIDS.
>
>
>
> *Joel Jansen *D +1 604 696 3511 M +1 604 218 3887
>
>
>
> *From:* SEGMIN <[email protected]> *On Behalf Of *Peter
> Annan via SEGMIN
> *Sent:* May 1, 2019 7:52 PM
> *To:* [email protected]
> *Cc:* Peter Annan <[email protected]>
> *Subject:* Re: [SEGMIN] full gradient mag surveys
>
>
>
> *This message originated outside Anglo American*
>
>
> ------------------------------
>
> Hi Richard:
>
>
>
> From my understanding and talking to many in the archeo field, these are
> primarily single axis gradiometers or arrays of these devices and not
> triaxial gradiometers.
>
>
>
> Someone may have a more advanced version since there are lot of people
> playing but have not see a triaxial unit. More likely to find the triaxial
> solution in the UXO area if there is one..
>
>
>
> Regards
>
>
>
> Peter
>
>
>
> *From:* SEGMIN <[email protected]> *On Behalf Of *Richard
> Smith via SEGMIN
> *Sent:* Wednesday, May 1, 2019 10:33 PM
> *To:* [email protected]
> *Cc:* Richard Smith <[email protected]>
> *Subject:* Re: [SEGMIN] full gradient mag surveys
>
>
>
> There are lots of archeological groups doing multisensory mag for Greek
> and Roman ruins, Stonehenge etc. There was someone from Flinders
> University in South Australia written up recently in Preview. These
> systems are generally towed by a quadbike or similar and are designed for
> open spaces like fields.
>
> Regards
>
> Richard Smith
>
>
>
>
>
> -----Original Message-----
> From: Roger Henderson via SEGMIN <[email protected]>
> To: segmin <[email protected]>
> Cc: Roger Henderson <[email protected]>
> Sent: Wed, May 1, 2019 8:07 pm
> Subject: Re: [SEGMIN] full gradient mag surveys
>
> Yes, Sergio did say GROUND and he gets offered helicopter systems.
>
> Hasn’t any one watched the British TV show “Time team” using triaxial mags
> for archaeology? I think they were fluxgates made by Bartington.
>
> Anyway plenty of others . Geometrics?
>
>
>
>
>
>
>
> *Peter Annan*
>
> Chief Executive Officer
>
> *Sensors & Software Inc.*
> 1040 Stacey Court, Mississauga, Ontario, Canada L4W 2X8
> [email protected] | +1 905 624 8909
>
> www.sensoft.ca <http://www.sensoft.ca/index.html>
>
>
>
> This transmission may contain PRIVILEGED OR CONFIDENTIAL INFORMATION.
> Unauthorized disclosure is strictly prohibited.
>
>
>
> On 2 May 2019, at 5:17 am, Stephen Reford via SEGMIN <
> [email protected]> wrote:
>
>
>
> Here is another one:
>
> http://www.shageophysics.com/heli-gt.html
>
>
>
> No doubt there are a few other heliborne triaxial gradiometers out there.
>
>
>
> However, I see that Sergio is asking for a *ground* triaxial gradiometer.
>
>
>
> *From:* SEGMIN <[email protected]> *On Behalf Of* Pierre
> Bérubé via SEGMIN
> *Sent:* May 1, 2019 3:12 PM
> *To:* [email protected]
> *Cc:* Pierre Bérubé <[email protected]>
> *Subject:* Re: [SEGMIN] full gradient mag surveys
>
>
>
> Never had any problems with these guys, they should be able to deliver
> what you want.
>
>
>
>
> https://www.facebook.com/Airborne-Geophysics-Eagle-K8aranda-Geophysics-133062360111477/about/
>
>
>
>
>
>
>
> Pierre
>
> <image001.jpg>
>
> *Pierre Bérubé, ing**. / Eng.*
>
> *Président / President*
>
> *_______________________________________________*
>
> *tel.: 1.819.874.8800 #201 fax: 1.819.874.8801*
>
> *1740 chemin Sullivan suite 1400, Val-d’Or (QC) Canada J9P 7H1*
>
> *www.ageophysics.com <http://www.ageophysics.com/>*
>
>
>
> <image002.jpg>
>
>
>
> *From:* SEGMIN <[email protected]> *On Behalf Of* S E
> Geoscience and Exploration via SEGMIN
> *Sent:* May 1, 2019 9:12 AM
> *To:* [email protected]
> *Cc:* S E Geoscience and Exploration <
> [email protected]>
> *Subject:* [SEGMIN] full gradient mag surveys
>
>
>
> Dear all,
>
>
>
> is there a ground geophysical contractor offering full gradient mag
> surveys?
>
> (horizontal gradient perpendicular to profile direction + vertical
> gradient).
>
>
>
> Thanks
>
>
>
> --
>
> *Sergio Espinosa**, Ph.D., P.Geo*
>
> Director, Geophysics
>
> *S E G*eoscience & *Ex*ploration
>
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*Sergio Espinosa, Ph.D., P.Geo*
Director, Geophysics
*S E G*eoscience & *Ex*ploration
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