infrared sensor for camera
Thanks!
Do you mean for imaging infra-red? If so, what wavelength? Monochrome camera chips will image near infra-red provided they don't have any filters incorporated.
Keith
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Have a look at the monochrome Aptina ones, for example.
http://www.aptina.com/products/image_sensors/
Keith
Yes! I need something like those, but ifrared and with smaller resolution if it`s possible!
The monochrome ones ARE infra-red although you didn't answer the question about which infra-red i.e. near infra-red or not. You need to do some searching yourself but simply look for monochrome cameras. Omnivision might be worth a look.
Keith
I you mean thermal infra-red (SWIR, MWIR or LWIR) you can have a look at:
http://www.flir.com/cvs/cores/
http://www.sofradir.com/pure-infrare...-products.html
http://www.optronics.co.za/market_focus.html - (http://www.xenics.com/en/infrared_ca...em_modules.asp) - my favourite
https://www.scd.co.il/dynamic-web.as...pgnm=Detectors
http://www.jenoptik.com/en_40152_rad...camera_modules
pm me if you want the other ones...
Yes! I think thats it! But the resolution of this sensors is very big and they are very expensive. I don`t need such resolution. Something like 30x30 or 40x40 is far enough. I need to detect temperature change in 4-5 square m for example. And I think 30x30 dots is far enough.
Thanks!
So you need a really cheap low resolution pyrometer?
To build something like these guys:
http://www.jytech.com/product/pro10.htm
I found some aptina staff in my supplier. I liked this staff : APTINA MT9P031.http://www.farnell.com/datasheets/323717.pdf
Here is it`s datasheet. The price is acceptable, but I have some concerns.
First: Are you sure I can use this monochrome image sensor as infrared one?
Second: As far as I`m seeing in the datasheet its resolution is 2048H x 1536V. I`ll use a microcontroller calculate some staff and I think it`ll be impossible for it to work with such big images. I need to manipulate a image in a few microseconds.
Thanks!
Now you have actually said you are wanting thermal imaging then the Aptina/Omnivision ones are not what you need - they only sense near infra-red. What you need is long wavelength infra-red. For NIR sensing you need the full data sheets to get the response of the monochrome ones. For example, the monochrome version of the Aptina MT9V022 is ok to about 1050nm.
Keith.
So, if i understood you well I need 1 sensor which is working up to 1000nm and may be a filter and a lens in front of it?!
Pyrometers work at longer wavelengths - up to 10um or more. You need to specify what you are actually trying to image and what wavelength you are after. For <1000nm then a monochrome camera will do the job - with a low pass optical filter if necessary - but I think you need longer wavelengths if you want to measure heat/temperature.
Keith
I found this http://www.google.bg/imgres?q=infrar...9,r:9,s:0,i:98
According to it I need much higher wavelenght. My sensor must work up to 60 degree for example, but this means wavelenght up to 10mm.
I sent a request to this guys
http://www.flir.com/cvs/cores/
for their ROIC cores. I think the resolution is good, but the price ...
Hi Stoyanoff
Lets try to get everything straight.
Do you want to detect temperature, meassure temperature, look at a picture or all of the above? There are MAJOR cost differences between these options.
Suppose you want to meassure temperature? Using Pyrometers or IR Thermometers are the cheaper way but you won't really get an image out of it.
Then read this article to get some insight:
http://www.pyrometer.com/processheating.html
Suppose you want to look at a picture and see which parts appears to be warmer than other parts without being able to determine the exact temperatures?
then you can go with a near-IR CMOS sensor + some lens filter.
Note that you will then STILL be looking mostly at the reflections coming from the objects and NOT thermal radiation given off by the object.
Suppose you want to look at the thermal radiation coming from the object and you want it in picture format where each pixel can also give you a temperature value?
then you are looking for a thermal IR detector of which there are three wavelength bands available
SWIR --> 1-3um
MWIR --> 3-5um
LWIR --> 8-12um
The wavelenghts in between those are not available (other than for Military/Scientific R&D anyway) due to the atmospheric absorbtion of thermal energy by the gasses that is present in the air that we breathe.
You get cooled versions (expensive but very sensitive) and uncooled versions (lots cheaper but not nearly as sensitive). For example QWIR detectors vs Microbolometers.
NOTE: If you are already worried about cost then these imagers are MOST definitely not for you. Not to even talk about calibrating them etc., I still have minor in-flight issues with my design in this area.
Thanks for the answer! Look here is my problem. I need to create a device which is working on 4-5 sq. m. for example. Obect(or a few objects) passes through this area. The temperature of the object is higher then the environment for about 20-30 degrees. So I must detect the derection of movement of the object when I detect it. I suppose I have to have a few sensors with which to separate the area to zones. Or this is my idea. So when a hot object passes from one sensors to another I`ll know its direction. Because of that I suppose I have to use a sensor array with atleast 400 sensors. Because of the possibility many objects to pass simultaniously I have to separate them somehow. I suppose if I use bigger resolution so I this way I`ll be able to "see" the empty space between them this is going to work.
Do you have a better offer for sensor?
Temperature imaging is typically done at 8-12μm (LWIR) wavelength, because thermal radiation at about room temperature is maximum around 10μm.
Low cost devices with single point are to be found in any motion detector (pyroelectric detectors).
If it is for imaging, microbolometer arrays offer the highest resolution (120x160 and larger) at high cost.
Lower cost and lower resolution is offered by thermopile arrays. Please see
http://www.heimannsensor.com/products_imaging.php
as an example.
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This is just another thermopile manufacturer I am aware of:
http://www.excelitas.com/Pages/Product/Thermopile-Detectors-Sensors-and-Array-Modules.aspx
You have to consider that you will need not only the imager, but some optics which is very special because of the wavelength (Ge or chalcogenide lenses, maybe plastic if your temperature resolution and image quality requirements are not too high). Of course then you need appropriate read-out electronics to get the image into your computer (or onto the screen).
So you better might consider asking for a complete module which includes everything (but has its price).