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William Murray

Magnetic Field Sensors

William Murray
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B_Albing
B_Albing
7/19/2013 9:10:41 AM
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Re: guass tesla conversion
Well, they better!

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EMCgenius
EMCgenius
7/19/2013 9:05:33 AM
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Teacher
Re: guass tesla conversion
 

All's well that ends well.  Other readers will appreciate the walk-through we provided.

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B_Albing
B_Albing
7/19/2013 8:41:36 AM
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Re: guass tesla conversion
Quite right. We'll be more careful with these mathmatical statements in the future.

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EMCgenius
EMCgenius
7/19/2013 12:42:54 AM
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Re: guass tesla conversion
In all fairness, the disconnect is simple.  If you had said 1T=10^4G, that stands alone as a fact, but without a numerical quantity on both sides, it reads that any number of gauss times 10^4 equals equivalent teslas, which is not correct.  That made all the difference.  Math is literal like that.

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B_Albing
B_Albing
7/18/2013 9:34:53 PM
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Re: guass tesla conversion
Ah... I think I see your point. The intent was to indicate that 1T = 10,000G.

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EMCgenius
EMCgenius
7/18/2013 9:32:10 PM
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Re: guass tesla conversion
Dimensional analysis keeps us on the straight and narrow.  10,000 gauss per tesla times teslas causes the tesla unit to cancel (teslas divided by teslas is unitless), leaving only gauss.  Going the other way, 10,000 gauss per tesla is the same as saying there are 0.0001 teslas per gauss.  Multiplying teslas per gauss times field strength in gauss leaves teslas as the unit.

In the article, the formula says teslas = 10,000 gauss per tesla times gauss, which calculates gauss squared per tesla -- a nonsense result.

Coulda happened to anybody.

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B_Albing
B_Albing
7/18/2013 8:57:32 PM
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Re: guass tesla conversion
Um... gosh - sometimes I just don't know what to say. Which for me is saying a lot. I'm sure at some point the fog will lift and all will become clear. Apparently today is not that day. Thanks for reading.

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EMCgenius
EMCgenius
7/18/2013 7:44:17 PM
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Teacher
Re: guass tesla conversion
We are agreed then: a tesla is 10,000 times stronger than a gauss.  Therefore divide gauss by 10,000 to get teslas.  Multiply teslas by 10,000 to get gauss.  The conversion in the article is bass ackwards.  Plug one gauss into it and see if you believe the result.  If the exponent had a minus sign it would work.

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B_Albing
B_Albing
7/18/2013 4:25:54 PM
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Re: guass tesla conversion
@EMCgenius - I'm confused about what you wrote. You said: There are 10^4 gauss per tesla which is true and matches what it says in the blog. But then you say It should say T=G/10^4 which is the inverse - and incorrect. A 1T magnet is a strong magnet. A 1G magnet - not so much.

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musiklab
musiklab
7/18/2013 7:31:30 AM
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Newbie
Linear Hall effect probe application
I once used Siemens SAS 231 W hall device for measuring magnetic flux in an application- it would output a voltage proportional to magnetic flux. 

Anybody know of a similar device available today ? 

NOW,

I´d like to be able to measure a probe distance from a strong magnet, able to hold itself,  to measure   thickness in a range of 1-10 mm with a repeat accuracy of  0.1 mm or better, presented as a linear DC voltage,  scaled to the proximity law

and calibrated in millimeters on a digital readout . 

Any ideas ? Anybody?

pls contact >>  michael@edinger.dk

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