Calibrating a Hall Probe for Magnetic Flux Density Measurements

[wynitia]

Hi there! I am have to plan an investigation. I have to calibrate a Hall probe to measure magnetic flux density and then investigate how the separation between two bar magnets has an effect on the magnetic flux density.

Can anyone help with calibrating a hall probe? I have searched the net and textbooks but they all tell you about the Hall effect and not a steo by step calibration method.

Also how can I be sure I am keeping the Hall probe directly between two bar magents? do I need a guide, or hover over a ruler to measure the distance (making sure I am exactly half way between two mountd bar magnets)

PLEASE HELP!1

Im so stuck and any help would be sooo appreciated.

Thanks guys

XXXXX

 

[Gokul43201]

Look at some of the threads here : https://www.physicsforums.com/search.php?searchid=175889

Specifically, see : https://www.physicsforums.com/showthread.php?t=70290&highlight=hall+probe

As for the measurement, find some way to position the magnets collinearly and then, you could either build a guide (with graduations on it) or simply use a ruler to define the midpoint. Just make sure all parts of the apparatus are non-magnetic (skip iron and steel things).

 

[wynitia]

Thank you for your speedy reply!

I think I checked out a forum, maybe it wad that one. Just one thing, if you're still online, when they say place the probe in a known field, how do know the field?? I am gettin my headin a muddle haha The graph for calibration is B against V yeh? Well you measure V on the voltmeter but how do you know B?

Thank you again
xxxxxx

 

[Cyclotron Boy]

Even though I haven't read the other forums, I would suggest a Helmholtz coil. Check out http://www.netdenizen.com/emagnet/helmholtz/idealhelmholtz.htm on how the Helmholtz coil pair works.