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John Robertson John Robertson is offline
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Default Help hacking a laser tape measure?

On 2019/08/06 9:26 a.m., N_Cook wrote:
On 06/08/2019 16:18, wrote:
On Tuesday, 6 August 2019 13:36:38 UTC+1, Â* wrote:
Some of us have time on our hands.
Some of us have a perverse level of curiosity.
Which leads some of us to do strange things for no apparent reason.

Peter Wieck
Melrose Park, PA


There is always a reason. The OP has not stated his.


A side-scan tide gauge (Google for one of those)Â* Where no resident's
land is anywhere near the river water at low tide, just the top of the
tide. But 100m off land is about 98% of all the tide range , with large
collector lens (with bored=thru central hole for the outgoing laser )
works in lash-up so far. And unusually for tide gauges any wave action
increases the valid responses to the receiver at the required acute
angle. In line bright sunlight at 100m will probably be out though. Tide
height is then inversely proportional to the measured distance, as long
as the waves are not too high but that would just give a spread of
heights, averaging to about true presumably oe t least offsettable. A
"proper" geodometer with interface topc is far too expensive for this
sort of project.



That would have been useful in the OP. Makes the project much more
interesting!

You could make (then secure and float) an IR reflector, much like a
radar reflector, for calibration.

https://www.instructables.com/id/Lig...dar-Reflector/

John :-#)#