A Fresnel lens is a type of compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses. The major advantage of the design is that it allows for the construction of lenses without the mass and volume of material that would be required by a lens of conventional design.
This means that construction of such a lens is much cheaper and easier than other types of concentrating lens.
Fresnel Mirrors can be made with several different techniques. In this video from the team at Green Power Science you will see a very simple way to make a Fresnel Mirror. The beam concentrates to a 2 inch diameter which is fine for things like boiling water or cooking. A more focused beam is needed to melt metal or burn wood.
This is a great demo project explaining the structure of a Fresnel Lens.
Tracey is an accountant and entrepreneur with a passion for nature. This passion is what spurred her interest in renewable energy, and the rest is history as they say. Tracey is a principal in Energy Think Group, the publisher of Solar Thermal Magazine and Tek-Think. She is also the principal at Women's Financial Help Desk. She spends her free time in the outdoors with her horses and dogs. She loves to travel.