Abstract
Infrared thermography is a promising solution that can help improve our lives. However, most of the common materials used to fabricate lenses are opaque in the infrared range. Silicon and germanium are better solutions. But shaping these two materials are truly complicated and time-consuming. Many companies have devoted themselves to develope new materials. Though some results have been published recently, the recipe of the new materails are still usually protected as the commercial secret. Due to material restriction, traditional lenses to focus infrared rays are ususally expensive. Poly(methyl methacrylate) is an ubiquitous polymor material. It is cheap and transparent in mid-IR range. More importantly, liquid PMMA can be shaped and solidified easily. Therefore, we chose PMMA as the material to design and make our IR lenses. In this research, we introduce a common material - Poly(methyl methacrylate) and discuss its optical properties in mid-IR range. We design a Fresnel lens with diameter 10 mm and f/1.4. We also run the simulation by using ZemaxR. The simulation results are the same as our design. We make the lens by our much low-cost and easier fabrication process. After that, we examine the structure and optical characteristic of our PMMA fresnel lens. The examine results also show that the lens is quite identical to our design.
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