Uses for IR Laser pointer
vjp...@at.biostrategist.dot.dot.com
If you shine an IR laser pointer on a tooth, the tooth lights up, revealing
cavities and fillings, perhaps as nonradioactive imaging. The IR laser
pointer also lights up cavities in various nonliving materials, perhaps
revealing their depths. I recently bought a flashlight with UV & IR LEDs
(search shopping.google.com for <UV IR LED>). because I was interested in a
cheap way to image building problems (UV shows moisture, IR shows heat leaks,
but in this case it lights them up.). Certainly it is no replacement for a
thermal imager worth thousands of dollars or a tooth x-ray, but might it, in
some cases, be "appropriate technology"?
- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm http://www.facebook.com/vasjpan2
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
ransley
I dont think so, a tv remote is IR and it lights nothing, IR is a
spectrum you cant see.
Frank
> On Oct 10, 5:46 pm, vjp2...@at.BioStrategist.dot.dot.com wrote:
>> If you shine an IR laser pointer on a tooth, the tooth lights up, revealing
>> cavities and fillings, perhaps as nonradioactive imaging. The IR laser
>> pointer also lights up cavities in various nonliving materials, perhaps
>> (search shopping.google.com for<UV IR LED>). because I was interested in a
>> cheap way to image building problems (UV shows moisture, IR shows heat leaks,
>> but in this case it lights them up.). Certainly it is no replacement for a
>> thermal imager worth thousands of dollars or a tooth x-ray, but might it, in
>> some cases, be "appropriate technology"?
>>
>> - = -
>> Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
>> http://www.panix.com/~vjp2/vasos.htm http://www.facebook.com/vasjpan2
>> ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
>> [Homeland Security means private firearms not lazy obstructive guards]
>> [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
>
> I dont think so, a tv remote is IR and it lights nothing, IR is a
> spectrum you cant see.
That's right. IR is not in the visible spectrum. I got curious though
and pointed my red laser level at my teeth and saw zilch.
It is possible to see things differently with different light sources.
UV for example causes some things to fluoresce and be seen in the
visible spectrum.
Larry Fishel
> ...IR laser pointer...
Just in case this isn't a joke, read these three word a few times
until you see what's wrong with them and work from there...
(Hint: the problem is related to why a flashlight with IR LED's would
be useless to most people.)
ransley
I missed that, an IR laser is good foor nutin
aemeijers
Designating targets?
--
aem sends...
Robert Green
news:i8thf4$adh$1...@news.eternal-september.org...
That's right, unless something fluoresces under either IR or UV light, it
won't look much different. We had similar claims made for IR theromometer
being able to detect studs behind walls because the studs transmitted more
heat than the insulation. Just more internet nonsense.
The only thing a cheap IR thermometer will tell you is when you are
approaching a window or door. Look at any photograph of a house made with a
thermal imager and you'll see that there's always significant heat leakage
around windows. As for finding studs, good luck with that. I've been
playing around my IR thermo since that last post and about the only thing
it's good for is detecting windows and doors - which you don't need a gadget
of any kind to find. I certainly wouldn't ever use it to try to decide
where a stud inside the house was. Besides, *inside* the house, where you
are most likely to want to find a stud, the temperature is equalized so no
difference would be seen.
You can look at these images and see what I mean. Doors and windows stand
out easily in pictures made by expensive thermal imaging cameras. Not too
many studs are visible, at least from what I can see.
http://www.saniglow.com/images/thermal-resonance.jpg
http://www.creategreenhome.com/images/building_IR_House_thermogram.jpg
--
Bobby G.
Robert Green
news:8P-dnVaEwuvgYC_R...@giganews.com...
Indeed yes. I've got a starlight scope (cheap Russkie surplus) that would
allow me to "paint" a target at night without revealing my position or that
the target is "lit up." Just found an IR laser module for sale for $20.
Hmmmm...
--
Bobby G.
vjp...@at.biostrategist.dot.dot.com
was no paperwork with the flashlight, only on the net ad that I bought it
from. Some ads don't say IR and yet their flashlight looks identical so I am
not sure how IR the IR is. But my teeth do light up like they are an echo
chamber for the light that hits them (highighting non-tooth material by its
darkness). Most transluscent stuff I point the pointer at light up the same
way. I think the label might better say near-IR and near-UV, because a lot
of med tek makes such a distinction. The plaque on my teeth looks yellow on
the UV setting, while the teeth look purple. There are a lot of equipment
which use UV and IR for construction, but they have fancy signal processing
software to enhance the image. I know an engineer who looks at how your house
temperature changes during the day to figure out where your insulation might
have failed. Still, given that this flashlight is five hundred times cheaper
than the fancy equipment, it is worth exploring.