Raspberry Pi Infrared Camera Module (NoIR) V2 - Wavelength

Help & Support Robot Parts
1

So, if I understand well, the NoIR camera can capture the spectrum from the visible light + the NIR wavelengths.
For my application, I need to filter out the wavelengths below 800 approximately. In other words, I don’t want any visible light to be captured by the camera, only the NIR (or above 800nm).

Is it possible to achieve ? And if yes do you sell those filters with the camera ?

Also, if you could answer this, or tell me something that might be usefull it would be great :

how much NIR light at 850nm (in the form of an array of LEDs) should be used to capture the result at a distances of around 1 meter (not more) with the NoIR camera?

Thank you

2

We offer a few different NoIR models:
robotshop.com/en/raspberry-p … ir-v2.html
robotshop.com/en/arducam-noi … ry-pi.html
robotshop.com/en/arducam-5mp … ry-pi.html

For example, RB-Adu-18 states “Without a filter the camera sensor can see short wavelength IR light around 800nm which is the IR wavelengths not generated with heat but just beyond the visible red light in the spectrum.”
Your needs are very specific, so you may just need to test it.

3

They didn’t really answer your questions. I’m doing something similar.

It is possible to filter out the visible light while still seeing the NIR light. What you want is an IR longpass filter with a cut-on wavelength of ~800 nm.

Here are some sources of relatively cheap acrylic filters:

edmundoptics.com/optics/optical-filters/longpass-edge-filters/optical-cast-infrared-ir-longpass-filters/

phillips-safety.com/optical-filter-glass/scanner-filters/phillips-near-infra-red-nir-filter-nir-filter.html

midopt.com/filters/ac800/

eplastics.com/Plexiglass_Acrylic_Sheet_Infrared_Transmitting

findrscope.com/SPD/acrylic-near-ir-longpass-filter-ac800-filter-acrylic-nir-longpass-filter–8000041C-1489014105.jsp

knightoptical.com/stock/optical-components/uvvisnir-optics/filters/long-pass-filters/acrylic-longpass-filters/colour-filter-acrylic-type-50x50mm-850nm-long-pass/

The amount of light you will need really depends on the setup. You’re going to have to experiment. Buy a few LEDs and try them out.