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Very large Fresnel lenses can generate truly awesome power start the experiments in this chapter with smaller Fresnel lenses such as those used as magnifying bookmarks before graduating to larger lenses!
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Where can I get a Fresnel lens
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Here are a few ideas for procuring a Fresnel lens, both second hand and new, cost varies widely: Car reversing lenses are a great source, like those pictured in Figure 8-18, these are often fairly
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Figure 8-18 Car reversing Fresnel lens.
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make the picture larger. This will involve a bit of disassembling so make sure you are with someone who knows what they are doing. Try to find an old broken set, not your father s latest HDTV wonder if you want to live to see your next birthday! Also, for a nice-sized meaty Fresnel lens, you can often find plastic screens that you put in front of your TV in order to make it appear bigger. If all else fails, a quick Google search will throw up a few results for optical suppliers. There are a lot of vendors selling kits to make large-screen projector TVs from an old screen these lenses are often very overpriced. Online auction sites are another good source, or school science catalogs. There are also a couple of entries in the Supplier s Index (see Appendix) for new Fresnel lenses.
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Figure 8-19 Diagram showing how a Fresnel lens compares to a conventional lens.
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Project 18: Experiment with Fresnel Concentrators
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to be lighter, they do not possess the same optical clarity as ordinary lenses which is why they are not used in cameras or microscopes. Take a look at Figure 8-20. It demonstrates that although our Fresnel lens is only a thin sheet of plastic, it can magnify things significantly. Now try and use your Fresnel lens as a solar concentrator, hold it above a piece of paper until you form a bright white dot of sunlight (Figure 8-21). Notice how much brighter the concentrated dot is compared with the rest of the paper, which is simply illuminated by the sun.
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How does a Fresnel lens work
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To understand how a Fresnel lens is constructed and works, we are going to need to do a little thought experiment. Picture this. You have a glass lens which is flat on one side, and round on the other. We are now going to use a tool to remove material from the center point of the lens. The tool has a flat end. We are going to remove material until the corners of the flat-ended tool just begin to penetrate the round surface. We are now going to use another larger tool to remove material from a circle around the last. We are going to do this until the tool just starts to break through the surface. We are going to keep doing this with progressively larger tools until we are left with a hollowed lens. If you were to look at the inside of this lens, what you would see is a series of flat steps cut in concentric circles. Now imagine flattening out these concentric circles so that they all lay in the same plane. What you have constructed in your mind is a Fresnel lens. Take a look at Figure 8-19, it shows how a Fresnel lens is simply a normal lens with the unnecessary glass removed and flattened. It is important to note, that although Fresnel lenses tend
Figure 8-20 A thin Fresnel lens shown magnifying.
Project 18: Experiment with Fresnel Concentrators
Figure 8-21 Concentrating solar energy using a Fresnel lens.
A few experiments that you can do with a Fresnel solar concentrator
Use a thermometer to measure the temperature of the point where the sun s energy is concentrated see what difference it makes if the bulb is covered in tin foil or black paper.
The intensity of the concentrated light might be enough to singe a feather, or even a thin shaving of rubber from a balloon or latex glove. Try shining the beam of light onto a photovoltaic cell connected to a multimeter and load see how it affects the amount of power produced. You might also want to see if you can melt a wax candle using the power of your concentrated light.
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