DIY Laser levelling using webcam and laser level

[Michael Gilligan]

For the present purposes, I’m pretty sure that we can take the line as being straight but fuzzy [i.e. noisy]
... Like so many things though: The closer you look, the more difficult it gets to describe.

This is what I find so impressive about this project ... the software is effectively using a ‘best fit’ definition of the line.

MichaelG.

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P.S. for what it’s worth ... here are some numbers from the specification of a ‘metrology-grade’ unit:

Beam Profile Line
Power Distribution over 16 mm ±10 %
Fan Angle 18 °
Focal Distance (factory preset) 180 (±2) mm
Line Length (@ focal distance) ~ 45 mm
Line Width (@ focal distance) 50 (±10) µm
Alignment of Optical to Mechanical Axis ≤ 0.6 mrad
Line Straightness (max. deviation from ideal line) ±2 µm (over 16 mm)
Depth of field (laser line < 60 µm) min. ± 5 mm