Author Topic: Sharp IR Ranger Finder Quick Question  (Read 2641 times)

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Offline sky099Topic starter

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Sharp IR Ranger Finder Quick Question
« on: March 21, 2008, 08:54:16 PM »
Hi, just wanted to ask a quick question about a Sharp IR Range Finder, we wanted to know if one of these would be able to read or bounce off IR light from a transparent acrylic surface, as in transparent walls. We're kinda stuck on that info, thanks in advance


 

Offline superchiku

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Re: Sharp IR Ranger Finder Quick Question
« Reply #1 on: March 21, 2008, 11:06:03 PM »
never tested on a transparent surface why dont u test it and find it out

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Offline Darkbluestar

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Re: Sharp IR Ranger Finder Quick Question
« Reply #2 on: March 21, 2008, 11:59:06 PM »
I have tested it on Lexan which is a clear plastic(like plexiglass only stronger) and the IR did not detect it. So it goes right through lexan. Hope that helps

Offline airman00

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Re: Sharp IR Ranger Finder Quick Question
« Reply #3 on: March 22, 2008, 06:44:41 PM »
I have tested it on Lexan which is a clear plastic(like plexiglass only stronger) and the IR did not detect it. So it goes right through lexan. Hope that helps

yep thats true

for my robocup junior competition I found out the walls were plexiglass and switched out my IR for sonar
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Offline superchiku

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Re: Sharp IR Ranger Finder Quick Question
« Reply #4 on: March 23, 2008, 12:15:50 AM »
its obvious ir still is just light so it will pass through transparent sufaces
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Offline airman00

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Re: Sharp IR Ranger Finder Quick Question
« Reply #5 on: March 23, 2008, 06:28:51 AM »
its obvious ir still is just light so it will pass through transparent sufaces

not necessarily

some materials that appear translucent to us in the normal light spectrum,  are solid to IR light. Like you ever notice on a remote control box you have like semitransparent dark plastic. Well you can't really see through it but IR goes straight through. 
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Offline superchiku

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Re: Sharp IR Ranger Finder Quick Question
« Reply #6 on: March 23, 2008, 08:17:24 AM »
well there are exceptions
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Offline Admin

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Re: Sharp IR Ranger Finder Quick Question
« Reply #7 on: March 23, 2008, 08:22:24 AM »
Quote
some materials that appear translucent to us in the normal light spectrum,  are solid to IR light.
(opaque, not solid) . . . but yes, exactly. There are transparency charts for materials vs. spectrum around if you just google around for it.

I can tell you for certain that glass is transparent, water is translucent, and snow is opaque in the IR spectrum.

The general rule of thumb is: anything that absorbs heat easily/quickly is opaque in IR.

Offline superchiku

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Re: Sharp IR Ranger Finder Quick Question
« Reply #8 on: March 23, 2008, 08:23:50 AM »
wont glass absorb heat if it is heated??
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Offline airman00

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Re: Sharp IR Ranger Finder Quick Question
« Reply #9 on: March 23, 2008, 08:39:23 AM »
wont glass absorb heat if it is heated??

it wont heat up quickly like metal
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Offline superchiku

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Re: Sharp IR Ranger Finder Quick Question
« Reply #10 on: March 23, 2008, 08:44:25 AM »
still i dont think admin's explanation is complete
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