That just cries out for a small laser. That we can do.
I was taught to make a crude one of those to find time and/or direction if lost, in Boy Scouts. But determining high noon on two consecutive days burns a day's ration of water if your lost.
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The same source laser, with an additional mirror mount on a long arm, lets you do a co-incidence rangefinder, tying in the basic trig. Ie overlap two laser spots to set your central distances. It will take some thinking, but your project is very "do-able"
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You can also skip the scanners and computer with some thought, using a laser, a beamsplitter with the co-incidence rangefinder, a rotary mirror with an angle readout, and some pegs for marking the locations. Do the whole thing by geometry. I suspect that would result in frustrated teachers, trying to explain all that layout in a 45 minute class period. However, I'm trained as a teacher, and right now I'm a Senior Technician at a major university, also working on a Masters in Adult Education. I understand what your trying to do. Laser shows led to lab lasers and other things, although I still do the odd laser show, now and then.
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OK Boys and Girls, we'll go with a TeM00 mode green DPSS at 532, a scan pair, a few optics to do some beam splitting, and something where we can get the frame refresh rate down to near DC, to optimize use of a license free Class IIA or Class IIIA laser in a bright sun light. For older children, he can turn up the laser power to the low end of IIIB. I actually thought of just using the galvo pair with a voltmeter to mark the locations with a dot, without even a computer, but I suspect that takes the "fun" and "interesting" out of the learning experience. (Well, unless your a serious math Geek)
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This just went from a show projector to a learning tool, and maybe down the road he could use RGB.
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I just contacted one of my two friends in OZ, lets see what happens.
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Steve
Last edited by mixedgas; 05-30-2017 at 17:00.
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...