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'[OT]:Infra RED light'
2002\05\23@170308 by Paul Tyrer

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Just a quick question.
I have a cctv camera recording the house, but in near darkness the picture
isnt very good, The camera's big sister had a ring of Infra red emitters
attached around the lense, there didnt appear to be a focusing lense
around the led's
If i got a series of Infra red emiitiers and devised a circuit to fit
around the lense would this help the viewing at night of the camera. The
camera is a bullet type Komco camera aprox 3cm x10 long.
Thanks in advance
Paul Tyrer



Kind Regards, Best Wishes.


Paul Tyrer.
Mob 07779956086
http://www.paultyrer.com/

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2002\05\23@173158 by Jinx

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Infra-red torches are quite commonly sold as accessories
for low-light viewing. Quite easy to make for yourself, or you can
buy a kit from an electronic store. Make a bank of 16, 25, however
many you want, IR LEDs, perhaps drive it with pulses for better
range. Jaycar, for example, have one in their catalogue

http://www.jaycar.com.au

Click on Our Catalogue,  Video Surveillance, Product Code
AA0290 for the IR torch or QC3468 to see a small b/w cammera
with IR illumination

Try a Google search for +"IR illuminator" +circuit - plenty of
hits for suppliers/kits, maybe a free circuit or two in there

===============================================

I've only had need to record at night once. It was the great
Which Neighbourhood Cat Is Peeing On The Stove In The
Middle Of The Night Mystery. Solved with a webcam, a couple
of IR LEDs and an 8-hour tape

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2002\05\23@175524 by Francisco Ares

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AFAIK, black and white CCD sensors have an IR filter in front of it, but
I do not know how difficult is to remove it.

Francisco


Paul Tyrer wrote:

{Quote hidden}

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2002\05\23@181859 by Jim

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If you need ir led's check ebay I just got 160 new for $9.00
cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1727321586
he may have more
That's what I was planning to do with them. I have an ir filter made
to replace the glass in a flashlight but the ir comes out in a very narrow
beam making it very hard to tell what your looking at.
Jim

{Original Message removed}

2002\05\23@192338 by Dale Botkin

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On Thu, 23 May 2002, Jim wrote:

> That's what I was planning to do with them. I have an ir filter made
> to replace the glass in a flashlight but the ir comes out in a very narrow
> beam making it very hard to tell what your looking at.

So point some of the LEDs off center, spread the beam out some...

Dale

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2002\05\23@194256 by Jim
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"you are" => "your" now?

IIRC it used to be "you're".

Jim

(Sorry - but THIS one really gets to me ...)


> On Thu, 23 May 2002, Jim wrote:
>
> > That's what I was planning to do with them. I have an ir filter made
> > to replace the glass in a flashlight but the ir comes out in a very
narrow
> > beam making it very hard to tell what your looking at.
>

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2002\05\24@022853 by Jim

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I'm thinkin ur rite


-----Original Message-----
From: Jim <spam_OUTjvpollTakeThisOuTspamDALLAS.NET>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Thursday, May 23, 2002 4:43 PM
Subject: Re: [OT]:Infra RED light


{Quote hidden}

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2002\05\24@031345 by Peter L. Peres

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On Thu, 23 May 2002, Jim wrote:

>If you need ir led's check ebay I just got 160 new for $9.00
>cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1727321586
>he may have more
>That's what I was planning to do with them. I have an ir filter made
>to replace the glass in a flashlight but the ir comes out in a very narrow
>beam making it very hard to tell what your looking at.
>Jim

Use a divergent lens.

Peter

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2002\05\24@061213 by Peter L. Peres

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Yes, make a string of IRED leds and connect them to +12V through a
resistor. Do not expect this to replace proper lighting.

Peter

On Fri, 24 May 2002, Paul Tyrer wrote:

{Quote hidden}

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2002\05\24@062049 by Peter L. Peres

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On Thu, 23 May 2002, Francisco Ares wrote:

>AFAIK, black and white CCD sensors have an IR filter in front of it, but
>I do not know how difficult is to remove it.

No, color ones have one. B/W usually don't unless they are high end.

Peter

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2002\05\24@062942 by Alan B. Pearce

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>No, color ones have one. B/W usually don't unless they are high end.

There was an item on a TV cop show here recently where a surveillance camera
had been put in a room, and on the monitor you could see the TV remote IR
led being operated by the "baddie". This would seem to bear this out, as I
would doubt they removed an IR filter for the program.

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2002\05\24@065324 by Peter L. Peres

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On Fri, 24 May 2002, Alan B. Pearce wrote:

>>No, color ones have one. B/W usually don't unless they are high end.
>
>There was an item on a TV cop show here recently where a surveillance camera
>had been put in a room, and on the monitor you could see the TV remote IR
>led being operated by the "baddie". This would seem to bear this out, as I
>would doubt they removed an IR filter for the program.

'Standard' testing of non-pulsed IR sources such as small lasers and IR
optocoupler alignment in equipment involves a CCTV camera and a monitor.
Any other way is a waste of time (I am not talking about tiny reflective
or transmissive off the shelf sensors). The cheapest CCD and CMOS cameras
work great for this.

Peter

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2002\05\24@081116 by michael brown

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> I'm thinkin ur rite

I think that would be u'r.  ;-)

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2002\05\24@095619 by Herbert Graf

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Most cameras made today use sensors that are HIGHLY sensitive to infrared,
and in fact have infrared blocking filters installed to compensate. You can
try adding IR LEDs to illuminate the scene, it will improve the performance
somewhat, however the best solution (it you are willing to deal with the
false colours produced during daytime) is opening the camera and removing
the IR filter. I have done this to quite a few cameras and the result is
stunning. A completely dark room is almost as bright as day when you use an
IR remote (with only ONE LED) as a flashlight. It is quite remarkable. TTYL


> {Original Message removed}

2002\05\24@175300 by Jim

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LOL

-----Original Message-----
From: michael brown <.....n5qmgKILLspamspam.....AMSAT.ORG>
To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Date: Friday, May 24, 2002 5:11 AM
Subject: Re: [OT]:Infra RED light


>> I'm thinkin ur rite
>
>I think that would be u'r.  ;-)
>
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>
>

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