Whilst interference with multiple SR300 cameras was a known problem when they were placed in close proximity to each other, it is less of a problem with the 400 Series cameras. The SR300 uses Structured Light, or Coded Light, for its projection, whilst the 400 Series uses Stereo imaging like the R200 and ZR300. Intel support have previously commented on this.
Intel encourage the scaling up of projects to multiple cameras instead of just one.
Thank you very much for your timely reply.
I also read the relevant posts you provided "'Re: Multiple D400 RealSense simultaneosly".
According to result, at present, many D400 series of interference will be much better than the SR300, but there is still a certain number of interference, right?
Then I'm going to buy D400 series for some experiments.