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Green light trigger

The detector loop is part of a tuned resonator. The polarity of the magnetic field created by the coils is alternating.

It is not clear to me how an additional, constant (!) magnetic field could have any impact on the loop inductance which is the triggering condition.


However, there are many ways of inducing current spikes in the detector loop from the outside (e.g. changing magnetic fields by either a moving magnet or by cranking the starter). Question is, if this will trigger the detector condition.
 
Curious... and frustrated.... I bought one of those Green Light magnets when they were first introduced.

Surprisingly, it was the instructions packaged with the Green Light magnet that has helped me the most. It pointed out how, where, and how fast to drive within the sensing fields (as indicated by the grid) prior to the light. To test this, I went to a light that has NEVER responded to ANY of my motorcycles (even the one with my new Green Light attached to the underside of my bike).
I parked off the road late on a Sunday night, took my magic-wand of a magnet at the end of an extension, and passed it (as instructed by Green Light) over the specified points of the grid. Though my bikes (with or without the Green Light magnet) have never triggered that light, my little magnetic 'wand' passed casually over the grid.... DID!

Well, I learned a few more things. Despite my using zip ties, duct tape, super glue, whatEVER, that Green Light magnet does NOT hold up well to vibration or the ride...... It broke up, parts of the magnet went missing, and what remained was covered in oil/grease/grit/grime/particulate.

I still can't get that light to respond to my bike.... and a few specific others. But check THIS out: Apparently there is a big magnet commonly used by the dairy industry to stuff down (one of) stomach(s) of a cow. These magnets catch metallic particulate (barbed wire & the like) that cows tend to 'eat'. I've been meaning to look for one of these bad boys and sticking it on the bottom of my bike....... and THEN approach a light sensor grid correctly, stealthily, while holding my tongue right.... and see if it works(?).
 
Once again, the sensor reacts on conductive material (aluminium, metal, gold, ...), not magnetic fields.

Having said that, if your magnet (or any other kind conductive material) is of sufficient mass, it will work.

If your magnet (or any other kind of conductive material) is close enough to the loop, it will work.

Mass of conductive material matters. Distance matters.

Magnetism does not.


Is snake oil conductive?... :nerd
 
Oooh. Didn't click that the field was oscillating. Darn. Without carrying a sheet of iron it'd take a detector loop and then synchronising the interfering field. Still gotta be doable though.
 
mosquito said:
Oooh. Didn't click that the field was oscillating. Darn. Without carrying a sheet of iron it'd take a detector loop and then synchronising the interfering field. Still gotta be doable though.
Click to expand...

I was more thinking of "The Pinch" used in Ocean's eleven...
 
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