Same as traffic lights. "Inductive-loop traffic detectors use an electrically conducting loop embedded in the pavement to send a signal to the traffic control system to indicate the presence of a vehicle."
this post was submitted on 06 Nov 2023
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So a large wooden horse could slip by without detection
If the large wooden horse is full of men in metal armor, purely hypothetically speaking, would the loop still not pick up the large wooden horse?
Technically speaking it would pick up the men in metal armors, not the wooden horse per se.
But the barrier would lift for the wooden horse full of men in armor indeed.
Depends on how high on their horse they are: They might be too far away to trigger the sensor.
This, it's like a metal detector but, bigger. Temporary boom gates might use infrared motion sensors like automatic lights. edit: "lights" like the lights some people have on their porch.
It's bigger in overall structure size, but isn't really that big itself. It's just a wire loop, they can be installed into existing roads with minimal effort - they just dig a narrow trench and then seal it up, it doesn't require more tarmac.
Huh, so that's a completely new concept I've learned today. Time to do more reading. Thanks!
Check the road in front of the gate. Those loops are usually installed after the asphalt so there should be a loop patched up with tar a bit smaller than a footprint of an average car.
looks like it really depends, https://us.beasensors.com/en/segment/vehicle-sensing-solutions/barriers/ has some information about the specific sensora they use.
Your URL code is wrong. [https://us.beasensors.com/en/segment/vehicle-sensing-solutions/barriers/](url), this gives the URL as text but the link is just URL.
This is working URL code: https://us.beasensors.com/en/segment/vehicle-sensing-solutions/barriers/ although you could just type the URL and the website/app should make it a link automatically.
Good bot
Beep boop.
There could be a motion sensor behind maybe? It could be one of those places that have a bunch of coils on the ground, wherein a large enough mass of metal gets detected by changing magnetic or electric fields, or something else entirely
Could be a lot of ways- an IR beam some where before the barrier. A motion sensor (usually IR or IR+ultrasound). Possibly some sort of movement detection on the security cameras.
Or a magnetic loop sensor, which is my guess. (You’d see the other sensors.)