Ways to reduce the impact of cover glass
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2024-03-28 04:50 AM - edited 2024-03-28 04:51 AM
Hi,
I'm using the VL53L4CX and I find that using the xtalk calibration still doesn't completely remove the data from the cover glass. Is there any other way to remove the near distance data?
The VL53L0CX can adjust the threshold of a signal by a function, can the LV53L4CX do the same?
Thanks
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2024-04-01 09:55 AM
The single zone sensors can be divided up into Histogram-based and standard ranging parts.
L0, L1X, L4cd are all standard ranging parts.
L1CB, L3X and L4CX use histograms.
On the histogram parts one can do a really good job of crosstalk calibration by simply pointing the sensor out into space. With no target, all the photons that come back are from crosstalk. And we can count them directly, and we can subtract the right number from each bin. (And with the histograms, there is no crosstalk past 80cm - which can be a big advantage.
With the standard ranging one has to work out the crosstalk by knowing the distance to the target, and using both the range data and the signal strength to work out the crosstalk value.
If you are having issues perhaps you can lower the crosstalk.
Read the article:
https://community.st.com/t5/mems-and-sensors/time-of-flight-cover-glass/ta-p/49259
it might give you some ideas on how to lower the value.
- john
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.
- Mark as New
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2024-04-01 09:55 AM
The single zone sensors can be divided up into Histogram-based and standard ranging parts.
L0, L1X, L4cd are all standard ranging parts.
L1CB, L3X and L4CX use histograms.
On the histogram parts one can do a really good job of crosstalk calibration by simply pointing the sensor out into space. With no target, all the photons that come back are from crosstalk. And we can count them directly, and we can subtract the right number from each bin. (And with the histograms, there is no crosstalk past 80cm - which can be a big advantage.
With the standard ranging one has to work out the crosstalk by knowing the distance to the target, and using both the range data and the signal strength to work out the crosstalk value.
If you are having issues perhaps you can lower the crosstalk.
Read the article:
https://community.st.com/t5/mems-and-sensors/time-of-flight-cover-glass/ta-p/49259
it might give you some ideas on how to lower the value.
- john
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.