Using simple circuitry, polarizing film, and LEGO® toy bricks, an undergraduate physics student from the Ateneo de Manila University recently built an improvised polarimeter that can optically assess the purity of Vitamin C (ascorbic acid) and other chiral substances. The device has potential applications in classrooms as a learning tool, and may pave the way for more cost-effective means to monitor the quality of some consumer products.
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The Ateneo de Manila University Department of Physics’ Photonics Laboratory’s polarimeter setup, built mostly out of LEGO® toy bricks, polarizing film, and cheap off-the-shelf electrical components. SOURCE: Felicidario and delos Santos. |
Polarimeters are invaluable laboratory instruments that can help infer the purity of a chemical by measuring the angle of rotation of polarized light that passed through the test sample. However, laboratory-grade polarimeters are prohibitively expensive, with a high-end model costing over $11,500 and a commercial manual polarimeter priced at over $1,200. This makes their acquisition and use difficult if not impossible for small laboratories and classrooms in developing countries like the Philippines.
