An induction loop can be used to control a traffic light, for example. Explain whether such an arrangement also works without voltage.
Does anyone know how to solve this
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For this purpose, permanent magnets would have to be attached to the floor of the motor vehicles. When the induction loop is traversed, a short voltage surge due to movement induction would occur in this case.
LG H.
The task is pretty stupid or unambiguous.
Because the light itself does not work without tension.
Such an induction loop also requires not only voltage, but rather complex electronics.
It is well understood whether such a loop in the ground could theoretically trigger any measurable effect even without external energy (“voltage”) when passing through a car.
Then you can say: theoretically yes.
Because by sewing and removing a (metallic) car to the loop, the magnetic field density of the earth’s magnetic field is changed, which almost certainly results in a measurable effect.
However, it does not control any traffic lights without further aids, amplifiers, evaluation electronics.
This would be possible in principle with the aid of a permanent magnet.
Theoretically, even the magnetic field of the earth could be considered.
Due to the moving iron mass of the vehicles, the existing magnetic field changes and this changing magnetic field produces a voltage in the induction loop.
P.S.: In the case of vehicles manufactured from aluminium, copper or plastic, this would not work.
Thank you. How could the Earth’s magnetic field be considered?
The earth is also a permanent magnet and an iron bush in this magnetic field changes the magnetic field, at least in principle. Whether this is practical, I am aware of it.
I don’t know how far that would be technically feasible. But it is an effect which would in principle be usable in the above sense.
Purely with induction this would not be known to me, but there are sensors for Uboot detection that can measure the change of the magnetic field through the Uboot and thus detect the presence and also direction and course.
Yes, this could theoretically be solved without permanently applied voltage. If the passing cars were equipped with permanent magnets, they could induce a voltage in the induction loop.
Such loops usually work by tuning the resonance.