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what can I do with a big sheet of fresnel magnifier plexiglass? Answered

my neighbor through out his old rear-projection television, and I salvaged the pane of  plexiglass with ridges in concentric circles used to magnify? or focus? the image.  I am sure I could figure out how to solar heat something with it.. but I thought you all would like to know that I am open to suggestions.

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skippyconsuelo (author)2010-06-15

so far, the boy and I have done the very obvious.. burn the lawn, burn paper, and boil water.. all in the late afternoon sun. At midday, that thing will be instantaneously hot.. I think I could weld with it!

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seandogue (author)skippyconsuelo2010-06-15

There's quite a bit of heat in that thar sunlight.

When you think about condensing a 3x5 panel (~15sqft) area of sunlight down to a 1/2" dia focal point, the energy density is nice and juicy.

Roughly speaking, an energy multiplier (at the working end) of well over 3000

Well there you go. Make yourself a solar furnace for melting down beer and pop cans. Then you can sell the ingots.

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caarntedd (author)seandogue2010-06-15

I guess that eliminates my idea of a new windshield for the car.

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skippyconsuelo (author)caarntedd2010-06-16

hmmm... OBJECTS IN WINDSHEILD MAY APPEAR CLOSER THAN.. stops the urge to tailgate insantly

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rickharris (author)2010-06-16

Offer it for sale - These large lenses are often used by flight Sim builders to put in front of their monitor to increase the sense of depth.

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user

thats a good idea, and I may do that, just as soon as I finish trying to melt pennies

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Shagglepuff (author)2010-06-15

I heard that you can melt pennies with those... Also, wear eye protection- burning out your retinas tends to be a bad idea.

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user

hey, thanks for the heads up on retina protection.. your a little late though. It was not as bad as an arc, or magnesium, or an eclipse, but it was worse than a 100 watt bulb. we realized it was damage after the first test, and we are all safe now.

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Re-design (author)2010-06-15

Super charged solar cell. (Or burnt out solar cell.)

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seandogue (author)Re-design2010-06-15

recently used to produce the most efficient solar conversion, as I recall from a webblurb AP pseudo-science story I ran across a few months back.

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seandogue (author)2010-06-15

Solar ovens are the way many use them. Can be used to power a Stirling engine quite effectively. Or just use it to be an "artist" and give momma earth a tattoo.

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lemonie (author)2010-06-15
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Burf (author)2010-06-15

Fire ants, beware!  If I can ever get my hands on a fresnel lens that large, I'm going to build something like this:

www.solarcooker-at-cantinawest.com/fresnel-lens-solar-grill.html

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