Fresnel Lens Focal Length Change with Water, Concentrated Solar Power
on Jun 24 in Lowes DIY
This is a raw unedited video in realtime demonstrating the physics of light through a Huger Fresnel Lens. As water is added to the Fresnel side of the lens, the Focal Length triples due to water filling in the grooves of the lens. The optical quality is reduced causing the light to spread over a larger area. The overall energy concentrated is the same (less water filtering). This solar Fresnel Lens with a 40″ focal length increased to almost 9 feet or 108″
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Thanks for the safety tip, Dan. Anything else we need to know about? =^[.]~=
If we every get wind here in FL I will test your turbine design. Looks really good, I just need wind.
Dan
hEY DAN, I LOVE THE ONE I GOT FROM YOU. IT HAS ENTERTAINED ME WELL. I HAVE COOKED HOTDOGS ON IT AND MADE COFFEE AND I TRIED TO COOK SOME FISH BUT I REALLY FRIED IT .
I MADE A COVER FOR MINE AND A PRETTY GOOD STAND. ITS NOT AS PRETTY AS THE FRAME YOU MADE BUT ITS STURDY. AND ADJUSTABLE. I TRIED THE WATER THING AND GOT RESULTS OF ABOUT SEVEN FOOT. IT RUNS MY ENGINE REAL GOOD. THANKS
MUDDy
@koenstr Correct me if I’m wrong,I don’t know about a Fresnel Lens but for a normal convergent lense the thicker it is the smaller the focal length is. Water works as part of the lense’s thickness.
but the question is: why is the focal length increasing???
Is there any kind of laquer or some other liquid that would harden with nice optical qualities to permanently increase your focal length?
nice tip
I learned something:-)
Norway
Amazing tool!
Another great video, I love our beloved Sol……
Oh & I enjoy Dan to!
PS:where is your wife lately?
Very interesting! Of course, you could always have a thing plastic or glass protector to keep water off the lens–without losing TOO much light.
I suppose the water collects in the ridges, which would HUGELY change the parameters of the lens.
Cool
that was your most nauseating video yet, but It still got 5 stars from me.
Dan Rojas is so tough, he eats still wool for breakfast.
Wouldn’t it be easier to have the groove side facing downwards? Or is the lens grooved on both sides.
Ok, I know they’re not grooves, but I don’t know what they’re called.
squirrelbong :
Is caused by the refraction variation caused by the water filling the grooves
of the Fresnel surface (i think).
Oooooo. Dan is smoking grass.
I bet the Florida Dew might of killed some of them poor ants on the ground around you
awesome
great video, is this effect caused by the water’s surface or the temperature change from the water?
Ususally I use a BBQ or open fire for charcol making, but I think the fresnel would be better as I’m sure the beam would be hotter than most BBQ’s and definetly more effecient, plus no open flame!
Wow! I had no idea the focal length would change like that with water. Also, you just gave me a very good idea. I often make my own homemade charcol for black powder, filters, ect…a Fresnel would be perfect for that. Just get a quart paint can, (clean) and fill it with pine or light wood with a very small hole in the lid,….and in a small time…30 mins or less you’d have a can full of high quality charcol! Now I know I need a fresne.!!!
Awesome as always
I didn’t realize that about Fresnel lenses. Thanks for the demonstration.
FIRST
cool