VL53L0X result deteriorate by 1mm with filter glass (recommended by ST)

[YGude.1]

We are using Vl53L0x for distance measurement up to 20 cm.

While testing with filter glass (recommended by ST) we observed result deteriorate by 1mm for few measurement areas against results without filter glass. 

Now I will work cross talk calibration, some software filter in order to overcome 1 mm deterioration of result. 

From ST side, if you provide some input on this deterioration and possible solution to overcome same then it will helpful to us.

[John E KVAM]

The photons that hit the coverglass and bounce back are called crosstalk. And they are averaged in with the photons that did what you wanted.

Say your target were at 10cm and you got 100,000 photons back. But 3% of those photons actually hit your glass and bounced back.

You would then under-range by 3%. As the 3000 photons are fixed for every measurement, the effect would be exaggeratedif you had a target with lower reflectivity.

to fix this you can do a crosstalk calibration.

There is an article on this subject at the top of the page.

Give that read.

https://community.st.com/s/article/Time-of-Flight-Cover-glass