Electronics > Electronics
invisible sharp IR rangefinder beam - made visible
Admin:
A major problem/advantage you may have with the Sharp IR rangefinder is beam width. Unlike sonar, its fairly thin - meaning to detect an object your sensor must basically point directly at that object. Beware of chair legs! hehe . . .
So just how thin is the emitted IR beam? Well getting out my trusty IR detector thingy, its about this big:
The detector changes IR light into orange-ish light. Ok so that image is partly faked because my digital camera for some reason couldnt see the orange light, so I re-drew it in for you to see. The beam width is the same diameter as the lens on the left of the Sharp IR rangefinder. As the IR detector was distanced away, the beam fades and expands.
Steve Joblin:
Great tool! I hear that you can also use a camcorder to see the IR light as well, though I can't seem to see it with my Canon ZR-10.
Where did you find such a card? Who sells them?
Admin:
Camcorders wont work cause they have IR filters. Many black/white cameras can see IR, but its mixed with visible light so you need a dark room to use them.
I found this card during a massive cleanup at work, no one needed it anymore so I took it.
Im sure if you google around you can find one . . .
Steve Joblin:
yep... about $12 at places like MCM... http://www.mcminone.com/product.asp?catalog_name=MCMProducts&product_id=72-6772
Rebelgium:
cheap vga cameras can see IR light.
Most cellphone have these camera's, like my nokia 6600...
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