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Today's topics:
* Incandescent IR power - 2 messages, 2 authors
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/f2dc4189cfeb0563?hl=en
* *Over 20 Poker Bonuses* - 1 messages, 1 author
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/c69aec137c25a31e?hl=en
* Cleaning a Wool Shirt - 1 messages, 1 author
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/f87b9ec30e59c5d8?hl=en
* good new!nike shoes =28USD,LV bags = 25USD,Jeans = 25USD,Coat = 30USD,T-
shirt = 12USD,Nokia N95=260USD.www.fashion-sky.com - 1 messages, 1 author
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/218ecb4a51ae0fbf?hl=en
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TOPIC: Incandescent IR power
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/f2dc4189cfeb0563?hl=en
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== 1 of 2 ==
Date: Fri, Jan 25 2008 7:53 pm
From: phil-news-nospam@ipal.net
In sci.engr.lighting nicksanspam@ece.villanova.edu wrote:
| I want to put a picture of a pregnant horse on a website using a Linksys
| WVC200 webcam. The data sheet says it can work at 2 lux and it has an IR
| filter (what does that do?) The vet says it's not a good idea to keep
| the 10'x20' stall lit and the horse awake all night.
CCDs are inherintly sensitive to some of the IR band. That's actually a
bad thing for usual visual band usage. So a filter is added to _block_
IR from reaching the CCD layer. It's often integrated with the CCD. So
this won't accomplish what you want.
For many high end cameras, mostly digital SLRs, there are companies that
will modify the camera to pick up IR. They can replace the filter with
one that only partially blocks IR, or lets it all in. And they can even
block the visual band (black filter), if desired. But I don't know if
anyone does this with webcams.
| Amazon sells $50 low-power IR LED arrays, with mixed reviews.
| Would a 100 W incandescent bulb run at low voltage work as well?
Not really. You have to be rather low in voltage to avoid too much
visual, and the power is way reduced that way.
| With some sort of IR filter (exposed film?) over the bulb?
A "black" IR-pass-only filter would be used. They are, however, expensive.
| So far, Linksys hasn't been helpful. When I asked on the phone about
| spectral sensitivity, the Indian-accented person asked me what OS
| I was using :-)
Almost certainly it will be sensitive only in the visual band.
--
|---------------------------------------/----------------------------------|
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
| first name lower case at ipal.net / spamtrap-2008-01-25-2146@ipal.net |
|------------------------------------/-------------------------------------|
== 2 of 2 ==
Date: Fri, Jan 25 2008 8:06 pm
From: Jeff
JB wrote:
> <nicksanspam@ece.villanova.edu> wrote in message
> news:fncj3b$eto@acadia.ece.villanova.edu...
>> I want to put a picture of a pregnant horse on a website using a Linksys
>> WVC200 webcam. The data sheet says it can work at 2 lux and it has an IR
>> filter (what does that do?) The vet says it's not a good idea to keep
>> the 10'x20' stall lit and the horse awake all night.
>>
>> Amazon sells $50 low-power IR LED arrays, with mixed reviews.
>> Would a 100 W incandescent bulb run at low voltage work as well?
>> With some sort of IR filter (exposed film?) over the bulb?
>>
>> So far, Linksys hasn't been helpful. When I asked on the phone about
>> spectral sensitivity, the Indian-accented person asked me what OS
>> I was using :-)
>>
>
> Your webcam is not sensitive to IR due to the filter (usually built onto the
> actual imaging sensor itself) so an IR illumination source would be no use.
> Only monochrome CMOS or CCD cameras 'see' into the NIR where you could use
> ~800-900nm LEDs successfully for 'illuminaton'.
> If you do actually need a colour camera, you typically need >2Lux of visible
> illumination. If you can accept monochrome images, buy an appropriate mono
> camera and use IR leds.
>
That's the way to go. Frys.com has an assortment of surveilance
cameras with built in IR arrays.
As far as the dim bulb goes, you'll find that cameras and lenses
sensitive to long wave IR are expensive. The IR LEDs are shorter wavelength.
On a related note. Camera conversion to IR sensitive are getting
popular. They remove the IR filter and do some mumbo jumbo with the
internals. They don't tend to be very sensitive, but give all the cool
IR effects such as dark skies and bright foliage.
Jeff
> JB
>
>
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TOPIC: *Over 20 Poker Bonuses*
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/c69aec137c25a31e?hl=en
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== 1 of 1 ==
Date: Fri, Jan 25 2008 9:02 pm
From: ILovePoker
*Over 20 Poker Bonuses*
Visit http://www.InternetPokerBonuses.com for over 20 poker bonuses.
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TOPIC: Cleaning a Wool Shirt
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/f87b9ec30e59c5d8?hl=en
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== 1 of 1 ==
Date: Fri, Jan 25 2008 9:23 pm
From: "Nicik Name"
"Mark Anderson" <mea@nospambrandylion.com> wrote in message
news:MPG.2201b2d43481514b9899f3@chi.news.speakeasy.net...
>I have this very warm 100% thick wool shirt that I need to clean. I
> know you can't wash wool in the washer but is there a simple cheap way
> to clean this without having to pay a dry cleaner?
DiDi Seven?
>
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TOPIC: good new!nike shoes =28USD,LV bags = 25USD,Jeans = 25USD,Coat = 30USD,T-
shirt = 12USD,Nokia N95=260USD.www.fashion-sky.com
http://groups.google.com/group/misc.consumers.frugal-living/browse_thread/thread/218ecb4a51ae0fbf?hl=en
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== 1 of 1 ==
Date: Fri, Jan 25 2008 9:52 pm
From: fashion-sky.002@hotmail.com
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