Great question --
Start with the article:
https://community.st.com/s/article/Time-of-Flight-Cover-glass
(it's also in the article tab at the top of the ToF questions)
Your problem is called crosstalk - photons that hit the coverglass and reflect back.
you have 3 basic solutions:
1) clearer, thiner, optical quaility glass.
2) Separate glasses with an opaque barrier between them (Hormix.com.tw makes them)
3) crosstalk calibratrion.
Or I suppose you can use any combination of the above.
But start with the article and go from there.
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