Joseph, Thank you very much for your instant response and help. Build them by myself definitely is a good idea, but the main concern is the time. How long does...
Some time ago I saw a US Navy site that had a calibration Helmholtz coil using a 5 gallon water bottle as a form, with a winding on each end. They don't have...
... Gary, You're welcome. You are going to need to specify a few parameters (whether you build or buy). These include: - magnitude of the desired field -...
Joseph DiVerdi
diverdi@...
Feb 2, 2005 1:41 am
473
The helmholtz coil, Would you please explain for me why you want that coil. I would prefer a coil which is not having blind angles while messuring the...
Gary, If indeed you want to measure sensor offset, I don’t know what a Helmholtz coil will do for you. The coil’s property is that it has a volume/space...
Hello all, I'm new to the group and I look forward to learning a lot about magnetics. The recent attention to Helmholtz coils has me thinking about repeating...
Years ago Dr. Noble published an article with full circuit diagrams for a few simple fluxgate circuits being used for steer-on-heading compasses and such. Does...
I have Richard's Fluxgate magnetometery article from September 1991, and also his data sheet showing a couple of corrections for this article. I'd be grateful...
Charles, Firstly thanks for your help. From my understanding, rotating magnetometer a circle is used to compensate the hard iron effect. The earth's magnetic...
Actually the ellipse is caused by soft iron. Hard iron simply adds an offset to the vector which the rotation will remove. Soft iron will cause an apparent...
... Hi Hasan! I got my KMZ51 from Germany: http://www.segor.de Their website is partly in English, but they do ship internationally and they even accept...
Hi Hasan, This seems like a good way to locate east/west and a poor way to locate north! That is, for direction-finding you are best having a rapid dependence...
Hi all! Just found this: http://www.geophys.tu-bs.de/dienste/mrode/magnetsrode_en.html Scroll down to the bottom of the page, and there you'll find some links...
Hi Hannes: It's an interesting overview paper, but leaves out the Cesium magnetometer. Recently I got a surplus FTS 4060 Cesium frequency standard and have...
Hello everybody!! Taking into consideration that you cope with electromagnetic subjects I would like to ask if anyone knows how to measure the Earth's ...
... For the electrostatic field, you'll need a "field mill": http://www.precisionstrobe.com/jc/fieldmill/fieldmill.html But that is not simple and low-cost...
Hi - a new guy signing-in. My interest in fluxgates dates back to the 80's, when I spent many hours slavishly building a fluxgate compass from a design in some...
Nikolaos, There are a number of devices that can be used to measure field and field change. The field mill has already been pointed out. I've used a corona...
Steve, I'm unfamiliar with the corona point measuring method you're describing. Can you please supply the patent numbers and if not too much trouble, your...
Thank you both for your help. I have now something to work with! "Charles R. Patton" <charles.r.patton@...> wrote: Steve, I'm unfamiliar with the corona...
Charles, Relevant patents would include 4,950,978 by Govaert. I put a full copy in Acrobat format on my web site at http://www.belljar.net/patents.htm . It's...
Hi all, Just a question, i have an ioniser that has four pin points that emit streams of ions, any ideas as to how much voltage these things spew out & also ...
Mark, Good point as these things are pretty readily available and cheap. Per the design of, for example, Govaert in his previously cited patent as long as the...
... [...] I have had some success with the metglas website. Go to http://www.metglas.com and click on "Magnetic Materials". This will bring you to a page where...
Here in the US we have these anti-theft tags that go on a lot of items in the stores. If you cut one of these open you will find 2 metal strips. The thicker...
Hi all im new to this group. Im a uiversity student who is looking for advice with a project. my aim is to equip a mobile robot with an electronic compass ...
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