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Views : 386,193
Genre: Education
Feb 27, 2024 ^^
warning: returnyoutubedislikes may not be accurate, this is just an estiment ehe :3
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User score: 98.42- Masterpiece Video
RYD date created : 2024-08-21T09:39:34.988597Z
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Top Comments of this video!! :3
We used magnetic 125kHz fields for pedestrian detection around mining vehicles. The detector chips we used were originally designed for automotive keyless entry, but with a strong transmitter we could push out to 40m detection distance. But magnetic fields drop off with R-cubed rather than R-squared with RF, so getting more range is much more difficult.
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I do electrical measurements.
When I use high voltage (usually 5kV DC) to measure insulation resistance with an older device (the measuring cables have thinner insulation and, likely, a weaker screen) nobody can move in the radius of about 5 meters in the room, because the disturbance in the magnetic field causes the resulting resistance (or more specifically the current, which is what the thing actually measures) to drop quite dramatically.
Even with the newer cables (they have like twice the insulation and using a different material, though beats me exactly which one), if I put my hand close to the cable, the measurement still tanks noticeably.
So... yeah, you don't even need a magnet for an experiment like that.
As for your question the answer is "virtually infinite". The only thing that determines it is how sensitive your device is.
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@Ichangedmynom
4 months ago
All fields are infinite, they just become immeasurably weak with enough distance.
3.9K |