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Some time before experimenting with MRI machines and building his own CT scanner, [Peter Jansen] wanted to visualize magnetic fields. One of his small side projects is building tricoders — pocket sensor suites that image everything — and after playing around with the magnetometer function on his Roddenberry-endorsed tool, he decided he had to have a way to visualize magnetic fields. After some work, he has the tools to do it at thousands of frames per second. It's a video camera for magnetic fields, pushing the boundaries of both magnetic imaging technology and the definition of the word 'camera'.
Source: https://hackaday.com/2018/02/15/high-speed-imaging-of-magnetic-fields/
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High Speed Imaging Of Magnetic Fields
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The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
If the thunder don't get you, then the lightning will.
(Score: 3, Informative) by qzm on Thursday February 15 2018, @11:50PM (4 children)
To be imaging (in the sense being used) it would need to 'focus' the magnetic fields on to a sensor, It does not.
It is just a 2d array of hall effect sensors being read. Not even GMR sensors (which would be rather a lot more sensitive).
You can purchase chip level sensors that do exactly this, and have been able to for quite some time, and with much MUCH higher resolution.
It is cute, but hardly anything new or particularly impressive.
And most certainly NOT a 'video camera for magnetic fields'.
As to the rather pathetic 'tricoder' and 'Roddenbery' references, have we really sunk so low that that carries some form of useful information?
(Score: 5, Informative) by takyon on Friday February 16 2018, @12:19AM
https://en.wikipedia.org/wiki/Tricorder_X_Prize [wikipedia.org]
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Friday February 16 2018, @01:32PM
https://en.wikipedia.org/wiki/Gauss%27s_law_for_magnetism [wikipedia.org] spot a problem with your lense idea here?
(Score: 0) by Anonymous Coward on Friday February 16 2018, @01:36PM
I work in wireless power transfer and think this would be a very useful tool if it had at least 50 MHz bandwidth. GMR sensors may be capable? samnpling the array would be intresting!
(Score: 2) by LoRdTAW on Friday February 16 2018, @02:14PM
Look, while you might not be impressed, others like me enjoy seeing people explore electronics as a hobby and build fun stuff like this. It doesn't all have to be functional and/or useful to be interesting and fun.