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Thermal imaging possible?

Posted: Thu Aug 23, 2012 6:10 pm
by vicary
I have tried removing the infrared filter from some old webcams, I am thinking of doing thermal imaging with a thermometer module attached as a control to room temperature.

My question is how the current camera module designed? Can I remove the IR filter as easy as normal webcams?

Re: Thermal imaging possible?

Posted: Thu Aug 23, 2012 7:52 pm
by ghans
AFAIK , there is no camera module yet.
There is a protoype , but the RPi has had protypes too. Several of them.
Cost-saving is very important for the foundation .
So , let's wait a bit ...

ghans

Re: Thermal imaging possible?

Posted: Thu Aug 23, 2012 7:59 pm
by maui
Aloha 'oe,

This question was asked several times in this thread http://www.raspberrypi.org/phpBB3/viewt ... =43&t=6120

but unfortunately has never been answered...and it is going to be a phone camera, so very small. :|

I belief in the RPi community that they will come up with a mod ;)

Re: Thermal imaging possible?

Posted: Mon Aug 27, 2012 3:30 pm
by skrenes
I imagine a lot of people will want to use the camera module to make some kind of automated surveillance device. That's what I want it for. I was wanting to make a baby monitor and don't mind added IR LED's for extra lighting. Hopefully a camera module with a removable filter is made available -- or two different camera modules: one with an IR filter and one without.

Re: Thermal imaging possible?

Posted: Thu Aug 30, 2012 2:49 am
by Grumpy Mike
The wavelengths you want for thermal imaging are way longer than you can detect with a camera sensor with the IR filter removed. Just look at the difference in price between an IR camera and a thermal imaging camera.

Re: Thermal imaging possible?

Posted: Thu Aug 30, 2012 3:01 am
by jbeale
A standard silicon CCD or CMOS sensor can detect near-IR wavelengths out to about 1 um, which can see things slightly less than visibly red-hot:
http://www.bealecorner.com/trv900/d8/ir/index.html

However that's a long way away from the exotic sensors needed for the 3-5 um Mid-IR wavelength band, which you need for imaging objects at or near normal room temperatures.
http://www.bealecorner.com/trv900/thermal/therm.html

Re: Thermal imaging possible?

Posted: Thu Aug 30, 2012 12:32 pm
by Gert van Loo
A standard silicon CCD or CMOS sensor can detect near-IR wavelengths out to about 1 um
So you can us it only for very, very, very close ups :-) :-) :-)

Re: Thermal imaging possible?

Posted: Sun Sep 02, 2012 10:04 am
by vicary
Sometimes it's hard to know what to read when a hobbyist seeks whether his idea is possible, thanks for pointing out the wavelength thing. :)

Re: Thermal imaging possible?

Posted: Thu Sep 06, 2012 4:53 am
by jbeale
Just today I came across this: http://www.melexis.com/Infrared-Thermom ... 0-776.aspx
Super-low resolution at only 16x4 pixels, but it is a true thermal imager (thermopile technology) and it costs about $65.
http://www.digikey.com/scripts/DkSearch ... 20&cur=USD

If you think that's expensive, compare that to a "traditional" thermal imager, like the FLIR line ranging from FLIR i7 at $2000 through FLIR T640 at $26000, to SC8000 at (? probably > $100k)
http://www.shopflir.com/p7655/flir_i7_i ... QgodB3UAew
http://www.shopflir.com/p12100/flir_t64 ... camera.php
http://www.flir.com/thermography/americ ... /?id=45674

Re: Thermal imaging possible?

Posted: Thu Sep 06, 2012 5:24 am
by vicary
jbeale wrote:... If you think that's expensive, compare that to a "traditional" thermal imager, like the FLIR line ranging from FLIR i7 at $2000 through FLIR T640 at $26000, to SC8000 at (? probably > $100k) ...
Extracted from http://www.flir.com/thermography/americ ... /?id=51657
... With this overstock pricing, you can experience beautiful high speed HD IR Imagery for at 1k by 1k for under $100k.

Re: Thermal imaging possible?

Posted: Mon May 20, 2013 2:51 am
by Bleugh
vicary wrote:I have tried removing the infrared filter from some old webcams, I am thinking of doing thermal imaging with a thermometer module attached as a control to room temperature.

My question is how the current camera module designed? Can I remove the IR filter as easy as normal webcams?
Looks like it ain't gonna be easy to remove the IR filter from the sensor as the glass 'undercuts' the plastic holding module,
RASPBERRY PI CAMERA MODULE DISMANTLEDsmallest.jpg
Dismantled camera module
RASPBERRY PI CAMERA MODULE DISMANTLEDsmallest.jpg (60.28 KiB) Viewed 12589 times

Re: Thermal imaging possible?

Posted: Mon May 20, 2013 5:51 am
by Maxion
Bleugh wrote:
vicary wrote:I have tried removing the infrared filter from some old webcams, I am thinking of doing thermal imaging with a thermometer module attached as a control to room temperature.

My question is how the current camera module designed? Can I remove the IR filter as easy as normal webcams?
Looks like it ain't gonna be easy to remove the IR filter from the sensor as the glass 'undercuts' the plastic holding module,
RASPBERRY PI CAMERA MODULE DISMANTLEDsmallest.jpg
Heh: http://www.raspberrypi.org/phpBB3/viewt ... 43&t=44339

Re: Thermal imaging possible?

Posted: Mon May 20, 2013 7:30 am
by leoninuk
Flir are far to expensive...

maybe this kind of IR thermometer with USB connection could be easily hacked?
http://www.ebay.co.uk/itm/NON-CONTACT-I ... 19ca52efd0

around 100£ on Ebay.
If you could read the data via usb and user a 2 stepper motor to automate the measures in X and Y axis....
Non usb version could be as cheap as 5-10£!! just scan , read the lcd with a camera? use same 2 motors to make multiple points/measure.

just my 2 cents.
Leo

Re: Thermal imaging possible?

Posted: Mon May 20, 2013 7:34 am
by ngy
Cool - good find! Any idea how easy it would be to interface with an RPi?
jbeale wrote:Just today I came across this: http://www.melexis.com/Infrared-Thermom ... 0-776.aspx
Super-low resolution at only 16x4 pixels, but it is a true thermal imager (thermopile technology) and it costs about $65.
http://www.digikey.com/scripts/DkSearch ... 20&cur=USD