Laser Range Finder Bricklet 2.0 does not measure distances lower than 5 cm

[cl-]

Hi all,

based on the specifications documented on your website, the Laser Range Finder Bricklet 2.0 should be able to measure distances lower than 5 cm.
In my first tests, I couldn't measure distances lower than 5 cm though. Is this a technical limit?

Cheers
Claudio

Technical specifications:
Distance (Range, Resolution): 0-40m, 1cm
Accuracy <5m: ±2.5cm (nonlinearity present below 1m)

[MatzeTF]

The datasheet only mentions a maximum range of 40m.

The datasheet also mentions that at close range (< 1 m), “the beam diameter is about the size of the aperture (lens)”. At distances closer than 5 cm, the receiver is probably no longer able to see the laser beam projected in front of the transmitter.

[borg]

I think the resolution is 1cm, which does not mean that it can measure distances below 5cm. Here is the manufacturer datasheet of the laser range finder itself: https://raw.githubusercontent.com/Tinkerforge/laser-range-finder-v2-bricklet/master/datasheets/lidar-lite-v3.pdf

It does unfortunately not explicitly specify a minimum distance. However, with a resolution of 1cm, and a accuracy of 2.5cm below 5m distance and "additional non-linearity below 1m" it sounds like 5cm for a low distance is reasonable.