IR projector frequency for D435i

• MartyG

  • February 27, 2025 23:44

  Hi Jdzitsiuk  The IR projector operates at around 850 nm.  RealSense 400 Series cameras do not interfere with each other, but they can interfere with non-RealSense devices nearby that use IR.  The intensity of the projection reduces as distance from the camera increases.

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• Jdzitsiuk

  • February 27, 2025 23:57

  Thanks Marty, this is the wavelength, right? I wonder about the frequency: for example I see that for D455 there are two options 57 KHZ and 91 KHZ in the API via RS2_OPTION_EMITTER_FREQUENCY. And whats the frequency for the D435i, is it 57?
  
  Yes, we currently use two realsense cameras and there is no interference between them, but there is an interference between cameras and the other device's remote (the remote stop working properly). So I'm trying to see what we can change on the other device side, thats why asking whats the D435i frequency

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• MartyG

  • February 28, 2025 00:18

  Yes, 850 nm is the wavelength.  

   

  As far as I can tell, the API instructions for 57 and 91 frequency (RS2_EMITTER_FREQUENCY_57_KHZ and RS2_EMITTER_FREQUENCY_91_KHZ) have not appeared anywhere outside of the API docs and have never been used by anyone.

   

  You can reduce the intensity of the IR projection by reducing the value of the Laser Power option.  You can also turn the projector off completely, though this will often lead to a reduction in depth image quality with more gaps and holes unless the camera is used in a well-illuminated location (as the 400 Series cameras can use ambient light in a scene for depth analysis).

   

  Intel's extensively detailed guide to RealSense projectors at the link below may be a more helpful source of information.

  https://dev.intelrealsense.com/docs/projectors

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