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]<mailto:[email protected]>> On Behalf Of Richard Smith via SEGMIN Sent: Wednesday, May 1, 2019 10:33 PM To: [email protected]<mailto:[email protected]> Cc: Richard Smith <[email protected]<mailto:[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]<mailto:[email protected]>> To: segmin <[email protected]<mailto:[email protected]>> Cc: Roger Henderson <[email protected]<mailto:[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]<mailto:[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]<mailto:[email protected]>> wrote: Here is another one: http://www.shageophysics.com/heli-gt.html<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]<mailto:[email protected]>> On Behalf Of Pierre Bérubé via SEGMIN Sent: May 1, 2019 3:12 PM To: [email protected]<mailto:[email protected]> Cc: Pierre Bérubé <[email protected]<mailto:[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/<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]<mailto:[email protected]>> On Behalf Of S E Geoscience and Exploration via SEGMIN Sent: May 1, 2019 9:12 AM To: [email protected]<mailto:[email protected]> Cc: S E Geoscience and Exploration <[email protected]<mailto:[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 Geoscience & Exploration ----------------------- SEGMIN community mailing list service ([email protected]<mailto:[email protected]>). Change your personal options here: https://lists.geosoft.com/mailman/options/segmin/rogah%40tpg.com.au<https://lists.geosoft.com/mailman/options/segmin/rogah%40tpg.com.au> Colleagues can join here: https://lists.geosoft.com/mailman/listinfo/segmin<https://lists.geosoft.com/mailman/listinfo/segmin> Archives: https://lists.geosoft.com/mailman/private/segmin/<https://lists.geosoft.com/mailman/private/segmin/> NOTE that <Reply> will reply to all members of the list. ----------------------- SEGMIN community mailing list service ([email protected]<mailto:[email protected]>). Change your personal options here: https://lists.geosoft.com/mailman/options/segmin/geofizzics%40aol.com<https://lists.geosoft.com/mailman/options/segmin/geofizzics%40aol.com> Colleagues can join here: https://lists.geosoft.com/mailman/listinfo/segmin<https://lists.geosoft.com/mailman/listinfo/segmin> Archives: https://lists.geosoft.com/mailman/private/segmin/<https://lists.geosoft.com/mailman/private/segmin/> NOTE that <Reply> will reply to all members of the list.
----------------------- SEGMIN community mailing list service ([email protected]). Change your personal options here: https://lists.geosoft.com/mailman/options/segmin/archive%40mail-archive.com Colleagues can join here: https://lists.geosoft.com/mailman/listinfo/segmin Archives: https://lists.geosoft.com/mailman/private/segmin/ NOTE that <Reply> will reply to all members of the list.
