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VL6180X measured distance is dependent on specularity of the target surface

BLudi
Associate

I am evaluating the VL6180X to be used in a microtiter plate detector device and have noticed the measured distance is significantly underestimated for specular/mirroring/glossy surfaces. Furthermore the results is stronglly dependent on the angle. If the surface is tilted along the long axis of the VL6180X, the measured distance increases both when its tilted to the right or to left. If the surface id tilted along the short axis of the VL6180X, the measured distance very stronly increases or decreases depending on the tilting direction. The effect is much larger than what could possibly be explained by simple geometry (and tilting matted surface has basically no effect).

What is the reason for these effects ? Can they be attenuated/eliminated or compensated for?

1 ACCEPTED SOLUTION

Accepted Solutions
John E KVAM
ST Employee

The Vertical Cavity Surface Emitting Laser (VCSEL) used has a limitation. The main bit of light that illuminates the center region of the cone starts just a touch ahead of the outer region. Generally this is not an issue, as the mathematical model used takes this into account. But for very reflective surfaces smooth the model breaks down a bit and there is a small offset. It is this effect you are seeing.


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2 REPLIES 2
John E KVAM
ST Employee

The Vertical Cavity Surface Emitting Laser (VCSEL) used has a limitation. The main bit of light that illuminates the center region of the cone starts just a touch ahead of the outer region. Generally this is not an issue, as the mathematical model used takes this into account. But for very reflective surfaces smooth the model breaks down a bit and there is a small offset. It is this effect you are seeing.


Our community relies on fruitful exchanges and good quality content. You can thank and reward helpful and positive contributions by marking them as 'Accept as Solution'. When marking a solution, make sure it answers your original question or issue that you raised.

ST Employees that act as moderators have the right to accept the solution, judging by their expertise. This helps other community members identify useful discussions and refrain from raising the same question. If you notice any false behavior or abuse of the action, do not hesitate to 'Report Inappropriate Content'
BLudi
Associate

Is this problem solved in the new VL53L3CX?