Re: Digital Lap Counter

[Admin]

Here’s what you need – a miniature version of the devices used for theft prevention at many stores

i believe they work by having a passive resonant circuit (an inductor and capacitor?) that is excited by an rf signal from the system.

You see these sometimes as stickers, and if you peel the back off, you can actually see the coil.

If you applied one of these to each car, and they were tuned to different frequencies, it’d be able to identify which car passed. The stickers would be light and aerodynamic (and movable from 1 car to another)

just an idea for how one might plausibly do such a thing

Edit: actually here’s a link on antitheft devices, scroll down to “swept rf” for a description and pictures of what i’m describing. as i figured, you should be able to have different tunings on the tags which are uniquely identifiable.

http://biz.howstuffworks.com/anti-shoplifting-device.htm?printable=1