IR Receiver/Demodulator [Design]

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From: Joerg on 18 Mar 2010 20:48

Dave Platt wrote:
> In article <2p75q51q8ao2vt8o3vjmoal2c9gcuot9h1(a)4ax.com>,
> Hammy <spam(a)spam.com> wrote:
>
>> As for an IR lens that filters out sunlight and other wavelengths just
>> rip one out of an old TV,STEREO whatever. All IR remote devices in my
>> house have a filter lens in front of the detector. I'm sure you could
>> find a scrap TV or something to scavenge one off for testing.
>>
>> I recall finding sources for the lens you can get it in strip form. I
>> cant find the site anymore but its inexpensive.
>
> Another option is to visit a store which sells sheet plastic (e.g. TAP
> Plastics, Professional Plastics), dig through their scrap bin, and buy
> as thin a piece of black acrylic plastic as you can find. This stuff
> filters out visible light, but the dye in it passes a significant
> amount of IR.
>
> I've taken some interesting photos, using an old Fuji FinePix camera
> whose Sony sensor has a less-than-efficient IR-exclusion filter,
> shooting through a simple home-made filter made from black acrylic
> glued to the end of PVC tubing. The results have the usual IR-photo
> appearance - the sky is quite dark, green leaves on trees appear
> almost white.
>

Hey, couldn't you use that for informal energy audits, find leaks in houses?

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

From: Tim Williams on 18 Mar 2010 21:12

"Joerg" <invalid(a)invalid.invalid> wrote in message
news:80fvvhFb78U1(a)mid.individual.net...
> Hey, couldn't you use that for informal energy audits, find leaks in
> houses?

Only if the house is the temperature of melting lead. Room temp stuff glows
in the << 1eV range, nothing a silicon CCD will see.

It works fine when the stuff is damned hot though. Like this guy's camera:
http://www.backyardmetalcasting.com/bucketfurnace3.html

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

From: Joerg on 18 Mar 2010 21:19

Tim Williams wrote:
> "Joerg" <invalid(a)invalid.invalid> wrote in message
> news:80fvvhFb78U1(a)mid.individual.net...
>> Hey, couldn't you use that for informal energy audits, find leaks in
>> houses?
>
> Only if the house is the temperature of melting lead. Room temp stuff glows
> in the << 1eV range, nothing a silicon CCD will see.
>

http://geektechnique.org/projectlab/254/how-to-turn-a-digital-camera-into-an-ir-camera

This guy's face probably isn't more than 100F.

> It works fine when the stuff is damned hot though. Like this guy's camera:
> http://www.backyardmetalcasting.com/bucketfurnace3.html
>

Looks like his server is down right now.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

From: Phil Hobbs on 18 Mar 2010 21:23

On 3/18/2010 8:48 PM, Joerg wrote:
> Dave Platt wrote:
>> In article <2p75q51q8ao2vt8o3vjmoal2c9gcuot9h1(a)4ax.com>,
>> Hammy <spam(a)spam.com> wrote:
>>
>>> As for an IR lens that filters out sunlight and other wavelengths just
>>> rip one out of an old TV,STEREO whatever. All IR remote devices in my
>>> house have a filter lens in front of the detector. I'm sure you could
>>> find a scrap TV or something to scavenge one off for testing.
>>>
>>> I recall finding sources for the lens you can get it in strip form. I
>>> cant find the site anymore but its inexpensive.
>>
>> Another option is to visit a store which sells sheet plastic (e.g. TAP
>> Plastics, Professional Plastics), dig through their scrap bin, and buy
>> as thin a piece of black acrylic plastic as you can find. This stuff
>> filters out visible light, but the dye in it passes a significant
>> amount of IR.
>>
>> I've taken some interesting photos, using an old Fuji FinePix camera
>> whose Sony sensor has a less-than-efficient IR-exclusion filter,
>> shooting through a simple home-made filter made from black acrylic
>> glued to the end of PVC tubing. The results have the usual IR-photo
>> appearance - the sky is quite dark, green leaves on trees appear
>> almost white.
>>
>
> Hey, couldn't you use that for informal energy audits, find leaks in
> houses?
>
Not unless the house is on fire. ;0

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net

From: Joerg on 18 Mar 2010 21:36

Phil Hobbs wrote:
> On 3/18/2010 8:48 PM, Joerg wrote:
>> Dave Platt wrote:
>>> In article <2p75q51q8ao2vt8o3vjmoal2c9gcuot9h1(a)4ax.com>,
>>> Hammy <spam(a)spam.com> wrote:
>>>
>>>> As for an IR lens that filters out sunlight and other wavelengths just
>>>> rip one out of an old TV,STEREO whatever. All IR remote devices in my
>>>> house have a filter lens in front of the detector. I'm sure you could
>>>> find a scrap TV or something to scavenge one off for testing.
>>>>
>>>> I recall finding sources for the lens you can get it in strip form. I
>>>> cant find the site anymore but its inexpensive.
>>>
>>> Another option is to visit a store which sells sheet plastic (e.g. TAP
>>> Plastics, Professional Plastics), dig through their scrap bin, and buy
>>> as thin a piece of black acrylic plastic as you can find. This stuff
>>> filters out visible light, but the dye in it passes a significant
>>> amount of IR.
>>>
>>> I've taken some interesting photos, using an old Fuji FinePix camera
>>> whose Sony sensor has a less-than-efficient IR-exclusion filter,
>>> shooting through a simple home-made filter made from black acrylic
>>> glued to the end of PVC tubing. The results have the usual IR-photo
>>> appearance - the sky is quite dark, green leaves on trees appear
>>> almost white.
>>>
>>
>> Hey, couldn't you use that for informal energy audits, find leaks in
>> houses?
>>
> Not unless the house is on fire. ;0
>

Seems to be working pretty well here:

http://www.hoagieshouse.com/IR/

He could even see where the veins run underneath the skin and they can't
possibly be on fire :-)

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.