Author Topic: invisible sharp IR rangefinder beam - made visible  (Read 3019 times)

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Offline AdminTopic starter

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invisible sharp IR rangefinder beam - made visible
« on: September 29, 2007, 07:16:06 PM »
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.

Offline Steve Joblin

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Re: invisible sharp IR rangefinder beam - made visible
« Reply #1 on: September 30, 2007, 09:14:06 AM »
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?

Offline AdminTopic starter

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Re: invisible sharp IR rangefinder beam - made visible
« Reply #2 on: September 30, 2007, 11:13:23 AM »
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 . . .

Offline Steve Joblin

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Re: invisible sharp IR rangefinder beam - made visible
« Reply #3 on: September 30, 2007, 11:59:04 AM »
« Last Edit: September 30, 2007, 12:00:09 PM by Steve Joblin »

Offline Rebelgium

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Re: invisible sharp IR rangefinder beam - made visible
« Reply #4 on: September 30, 2007, 03:55:32 PM »
cheap vga cameras can see IR light.
Most cellphone have these camera's, like my nokia 6600...
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Offline TrickyNekro

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Re: invisible sharp IR rangefinder beam - made visible
« Reply #5 on: September 30, 2007, 04:42:57 PM »
All CCD cameras can see the IR light emitted by a various source!!!
My webcam, my K800i (3.2 megapixel... can it be compared to VGA???), my old camcorder... Anything that uses a CCD sensor can see IR light!!!
Check out tube lamps (well don't know exactly the name) the emit IR... When seeing the light in reality it is white... but through a CCD camera it seems to be a little blue...

Also, have you ever tried to have a very very close look at an IR LED... Try it and you may realise that you can see a very very dim red-like light just in the middle of the LED... don't know what it is but it's visible!!!
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