DIY Laser levelling using webcam and laser level

[John McNamara]

Hi Joe

I ran the tests again this time using a small LED torch as a bright light source.
This gives a very sharp high contrast graph.

Strangely the scaling changed to 119.9 pixel lines with the new light source. I repeated the test a couple of times. the results were the same.

I did not change the gap between the wire and the sensor. it must be caused by the change in light source.

I used the software measure table and recorded every step between zero using 0.05mm steps see image below.

The setup I am using moves the sensor not the wire, Important for a point light source to avoid the shadow elongating like the sun in late afternoon.

This is easy to prove moving the torch by the slightest amount changes the measurement.
I really want to find an evenly dispersed light source.

I have yet to try your smoothing settings, That will be interesting.

Edit just noticed the software has changed a bit more. I will update


Regards
John