Laser beam passing through glass

[Ormond]

I'm taking some levels for a floor and there is a large window of glass....will the laser be accurate still after passing through the double glazing?

 

[Lincs Lass]

Will the glass act like a prism and redirect the beam,,any impurities in the glass could cause problems

 

[PSQ]

The glass will refract (bend) the beam ever so slightly as it passes through, unless it hits it perfectly square. Double glazing doubly so, probably dim the beam a lot too.

Best to mark the glass where it hits with a Sharpie, move the laser to the other side of the glass and line up the laser with the Sharpie mark. Spot of alcohol hand gel to remove the mark, job sorted.

 

[Ormond]

That's what I was thinking ...a slight bend could give an inaccurate reading....trying to match up floor levels in an extensive. I'll try the mark the glass method and compare

 

[Sharpy]

Take the glass out if accuracy is vital, a decent window fitter will not be that expensive.

 

[Ormond]

It's a 2m arched window to the floor. It's to come out anyway but not just yet. It's a hardwood frame. It's possible to take the outside bead off and drop a pane of glass out....

 

[Adeptandy]

There's your answer then, hammer, sheet of ply, jobs a good un

 

[Ormond]

Haha... the problem is the rate the project is moving....the plywood would need to be well treated to last

 

[spark plug]

Fancy modern technology foiled by a pice of glass

Time to go all cave man and get the water level out

 

[Adeptandy]

Haha... the problem is the rate the project is moving....the plywood would need to be well treated to last

Sounds like the project I’m working on, supposed to be my fill in job, still going 6 years later

 

[mo!]

Water level is the answer. You can go round corners as well.

 

[e3120]

Yes, a bit of refraction if not dead square, but minimal. Not dissimilar to sharpie accuracy. I'd be very interested in a comparison of before/after knocking the glass out.