There are three types of Fresnel lenses, linear, spot, an continuous linear. Linear and spot lenses look similar in terms of the circular Fresnel pattern but a spot lens may appear more transparent. Spot lenses produce a very small tight beam at the optimal focal length and are generally more powerful size for size. Linear lenses produce a longer flat beam ranging from 1 inch high by 3 inches wide up to 1" x 12".

Continuous linear lenses are rarely used and produce a beam the length of the lens much like a parabolic trough. Optically stable UV inhibitors are required for lenses experiencing solar exposure to the sun or the materials will deteriorate rapidly with sun exposure.

Linear Fresnel Lens Advantages:

 Less chance of damaging equipment if liquid evaporates

 Long beam can be spread the length of a pipe

 Powers a Steam Engine slower but more safely

Disadvantages:

 More opaque due to physical nature, less light (power) transferred to project

 Cannot be used for melting metals



Beam NOT continuous Linear like a trough (1" tall x 3" - 6" wide optimal)

Spot Fresnel Lens Advantages:

 High power heat transfer (available in Crystal Clear Acrylic perfection cutting)

 Can be set to less of a focal length (ideal for cooking)

 Melts copper and many other materials

 Powers a Sterling Engine and Steam Engine

Disadvantages:

 Instant flame and work hazard

 Equipment damage

 Does not spread over a pipe surface evenly





















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