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

YGude.1
Associate II

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.

1 ACCEPTED SOLUTION

Accepted Solutions
John E KVAM
ST Employee

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


If this or any post solves your issue, please mark them as 'Accept as Solution' It really helps. And if you notice anything wrong do not hesitate to 'Report Inappropriate Content'. Someone will review it.

View solution in original post

1 REPLY 1
John E KVAM
ST Employee

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


If this or any post solves your issue, please mark them as 'Accept as Solution' It really helps. And if you notice anything wrong do not hesitate to 'Report Inappropriate Content'. Someone will review it.