I have removed Fresnel lens from rear projection TV but it is plane/smooth/without grooves/without Newton rings. It concentrate the solar radiations to some extent. The Fresnel lens with grooves is more effective to concentrate the solar radiations. I am interested to convert it into grooves. I hope that the audience can help me in this regards.
Without some pictures I have to let my imagination work ...
Are you aware that this Fresnel lens has a large focal distance? From some blog I found that a guy was able to focus the sun to a spot of about 2 cm Diameter. Isn't this sufficient for you? (Might become even better with some support structure keeping the lens level.)
Regards
Dear U. Dreher thanks for your suggestion, I need the focal area of about 6 inch having temperature more than 1000 oC.
If you mean a diameter of the focus of 6 Inches - reaching beyond 1000`°C, even the big lens recovered from the TV may simply be too small.
If you have the solar radiation (power density per m²) and the power requirements to heat your target area, you should be able to estimate how big the area must be at least to acquire enough energy.
Almeria (Spain - see https://de.wikipedia.org/wiki/Plataforma_Solar_de_Almer%C3%ADa ) has beyond 20.000 m² of mirrors. Regrettably wikipedia does not give the diameter of the focus (which I'd call "considerable").
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