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Mate rov underwater range finder
Posted: Dec 3rd, 2014, 6:31 pm
by Erik102696
So for the mate completion this year we need to measure ALOT of stuff. But in past years we tried slapping on a tape measure on it. But I want to use a more eligent solution
. But I also don't want to spend an arm and a leg.
Thanks
Re: Mate rov underwater range finder
Posted: Dec 3rd, 2014, 9:09 pm
by scubersteve
I will be quietly watching this thread...
Re: Mate rov underwater range finder
Posted: Dec 4th, 2014, 12:14 am
by Technoviking
can you waterproof a hunting range finder, or dismantle a shop bought one and squeeze it into a PVC housing with a window for the laser and receiver? or do the rules prevent you from purchasing a commercial unit?
Re: Mate rov underwater range finder
Posted: Dec 4th, 2014, 4:21 pm
by rossrov
First thoughts are:
Do you need to be able to measure subject/object distance from ROV, or just know when the ROV is a certain distance away from the subject?
You need to be able to determine the size of subject.
What accuracy is required by the rules and does greater accuracy mean a greater score?
What other requirements does MATE have. Laser safety? Passive or active systems?
Re: Mate rov underwater range finder
Posted: Dec 6th, 2014, 10:18 am
by Erik102696
We have to measure the length of many different objects. For example we need to measure a "iceberg" that's made out of pvc. It has to be accurate to about 5mm. With lasers wouldn't refraction be an issue?
Re: Mate rov underwater range finder
Posted: Dec 6th, 2014, 5:08 pm
by rossrov
I could describe in detail how to build something simple to do the job but that would kind of go against MATE's goals. So here are some more clues
http://en.wikipedia.org/wiki/Refraction
If you search the forum you will find a thread regarding this where Lasers are described. I posted my 2 cents worth there as well
viewtopic.php?f=14&t=595&p=5387&hilit=laser#p5387
A passive optical range and size measuring device could be made with mirrors based on the same principles linked to below. Distance then size can be calculated using basic trig. once the angles are known
http://www.google.com.au/search?q=Coinc ... 24&bih=643
http://nyfirearms.com/forums/long-range ... inder.html Scroll down the thread to diagram
The good thing about ROV stuff in a way is that distance is limited by water visibility. Shorter distances are easier to work with - precision easier than with long distance so you can get away with much rougher tolerances than the military or firearm enthusiast gear.
A Sextant as used in navigation could give you some ideas - it too uses coincidence principles, just a bit different
Re: Mate rov underwater range finder
Posted: Jun 29th, 2021, 6:35 am
by Garry987
It this information true for today? I’ve got this project where we want to measure the depths of some areas that are covered in water. Basically, we want to find out how deep the puddles are, from a few centimeters to a few meters.
And I’ve got this Lidar-Lite 3 Laser Rangefinder that I could possibly mount on one of my drones .
Question is, is this a match ? Will the Lidar go all through water and give me my water depth, or rather reflect on the surface , or somewhere in between depending on some parameters ? Anyone ever tried this ?