I bought a cheap one for a few euros on ebay. It is from plastic. It really concentrates on one spot and in a few seconds one can put fire to an object. There are some examples on youtube as well (for example distillation of water). You can have big Fresnel lenses (like in a light tower). If you maybe combine the light from the Fresnel lense with solar cells, or only let through one wavelength...
thanks for sharing this ,
trainstation21 2 years ago
Great over view!
check out user/GREENPOWERSCIENCE as well for more ideas... ;-)
1urbandevil 2 years ago
maybe combine this focussing techniques for using with the solar tower.
dontblamethemessenge 2 years ago
did you know about the Fresnel lense?
I bought a cheap one for a few euros on ebay. It is from plastic. It really concentrates on one spot and in a few seconds one can put fire to an object. There are some examples on youtube as well (for example distillation of water). You can have big Fresnel lenses (like in a light tower). If you maybe combine the light from the Fresnel lense with solar cells, or only let through one wavelength...
dontblamethemessenge 2 years ago