IR View of Magnetic Field?

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IR View of Magnetic Field?

Post by LloydK on Sat Aug 19, 2017 9:45 am

It occurred to me this morning that magnetic fields should be viewable in IR light.

Here's an IR image with this caption. It just looks like a blob giving off heat.

An infrared camera shows iron particles heating a tumor to liquefication, while adjacent healthy tissue
http://www.nanoprobes.com/newsletters/2013-08-Curing-Cancer-with-Magnetic-Nanoparticles/images/infrared-liquefy-tumor-1338x728.jpg

Here's a dog in IR.
http://www.pvs4.com/Infrared_camera_thermacam_SDC_mascot.jpg

I can't find any IR views of a magnetic field. Shouldn't a strong magnet have a field that's visible in IR?

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Re: IR View of Magnetic Field?

Post by LongtimeAirman on Sat Aug 19, 2017 11:56 pm

.
L. It occurred to me this morning that magnetic fields should be viewable in IR light.

A. Hi Lloyd. What makes you think so?

I suppose it depends on what’s making the field, its size, strength and location, but if there are no iron filings, ferro-fluid, metal dust or some other marker, I don't see how we could “see” the magnetic field in Infrared or any other band. IR allows us to easily distinguish between temperatures, I’m not aware that magnetic fields noticeably heat up anything besides maybe high voltage electric transformers, conductors and circuits under load
.

L. Here's an IR image with this caption. It just looks like a blob giving off heat.

An infrared camera shows iron particles heating a tumor to liquefication, while adjacent healthy tissue
http://www.nanoprobes.com/newsletters/2013-08-Curing-Cancer-with-Magnetic-Nanoparticles/images/infrared-liquefy-tumor-1338x728.jpg

A. As your picture ‘60C=140F’ shows, we can easily see the temperatures. I don't see any liquefication, thank goodness.

L. Here's a dog in IR.
http://www.pvs4.com/Infrared_camera_thermacam_SDC_mascot.jpg

I can't find any IR views of a magnetic field. Shouldn't a strong magnet have a field that's visible in IR?

A. Cute.
In your local electrical distribution system, IR monitors are primarily used to survey circuits in order to find “hot spots”. If mechanical connections between conductors are slightly loose, the point will become many degrees hotter. If not corrected, over time a failure at that point becomes certain, something will burn open.

Giving you my best WAG, In order to see a magnetic field I’d guess you would need to be able to distinguish how strongly electrons or ions are polarized, seems a much more complicated prospect to measure compared to a temperature increase.

.

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Re: IR View of Magnetic Field?

Post by Jared Magneson on Thu Aug 24, 2017 9:21 pm

I also couldn't find so much as a single infrared photo of a magnet, kinda frustrating. Perhaps there's nothing to see, other than the temperature of the magnet?

But I was able to find multiple citations of using a magnet to warp a decent camera's images from visible to infrared! Kinda interesting, though I don't know how accurate it is or how well it works. Perhaps the magnet is up-spinning the incoming infrared photons into a more-or-less visible range?


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