Hello all, As a newcomer to the group, this is my first post, so be kind. :-) I have built a torsion-balance magnetometer(TBM), and I am quite pleased with its...
... Joe, Welcome to the group. Don't worry, [magnetometer] is a rather friendly group. What makes you think that pointing a TBM east-west offers higher...
Joseph DiVerdi
diverdi@...
Dec 29, 2005 3:00 pm
635
... I'm not sure that it would apply to a torsion-balance magnetometer, but some of the electronic sensors are very sensitive to magnetic fields, but only in...
Hi Joe: It's because with an East-West magnetometer you can turn up the gain. The actual sensor has the same output, but the system is more sensitive. If by...
All, Depending upon the observer's location the EW component of terrestrial magnetic field can be substantially larger than the NS component. See, for example,...
Joseph DiVerdi
diverdi@...
Dec 30, 2005 4:45 am
638
Hi Joe: The referenced plot is of the diurnal variation, not the size of the respective components. It may be that the diurnal changes in the E-W field are...
Brooke, Indeed, you are correct. I did mean to point out the comparison of the daily variation rather than the "bulk" value in the principal directions. Chalk...
Joseph DiVerdi
diverdi@...
Dec 30, 2005 3:29 pm
640
Hi all! Happy New Year from Europe! 1h20m to go ;-) Best regards, Hannes. -- +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ ... ...
Happy new year. This group is like geomagnetic activity or sunspot activity(I hope I am right). There is activity for some time and none at all for a long...
Hi Brooke Have just returned after a long absence and have been looking through old posts. Did you pursue the 'drinking straw' sensor and come to any ...
Hello all, Thanks to all who reponded to my post of 12-29 concerning orientation of a torsion balance magnetometer(TBM). I have come to realize that the real...
Yesterday I ran across some PSN-L archive postings from 2000 in which Charles Patton discussed security tags as being sources of mu-metal/permalloy and even...
You can find the good one at Wal-Mart, or Zellers, if you are in Canada. These are small plastic strip with bar-code on it, glued on the package wou buy. I...
Hi Colin: I have the home made flux gate on hold, but am collecting materials to make others. Coffee stirring sticks are much smaller in diameter than soft...
Better late than never, I was out of town, so a belated: Happy New Year! To everyone on this list. Hannes, a quick question for you. I *finally* am getting...
Try Magnetics Corporation. They make the ring cores that most people use for toroidal fluxgates. They make the cores for directional drilling for the oil...
Thanks for the advice and feedback which caused me to go away and find out more about these tags. I now know that I've been collecting RF tags, not Metglas...
Hi Colin: The Metglas samples and the 0.005 inch diameter wire both come annealed so no hydrogen furnaces required. The reason for the hydrogen (or forming...
... You're absolutely right - why didn't I spot this ? One less thing to be concerned about. ... I'll have to look around for something similar. Would much...
... they ... I eventually managed to acquire a handful of these - but this has been difficult, as many UK libraries are (unwisely, imho) no longer installing...
Hi Colin! Thanks for the hint! I was actually expecting a post from "C. Palmer", so I was pretty surprised when I saw a completely different name. I thought I...
You're welcome. For anyone in the group who doesn't know what the Moderator's post relates to .... A rather dubious character (real name Mustafa Umut Sarac) ...
Hi to all group Is the first time that I write in this group, I´m making a project to measurement the earth field and I am beginning it. The first problem...
Hi to all, i have started to design my fluxgate magnetometer and i have 2 questions; is there a frequency limit for the excitation coil, can it operate at 20...
There is an interesting write-up in the "Design Ideas" section of EDN Magazine: "Virtual instrument determines magnetic core's B-H-loop characteristics". ...
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