30 September 2016 A refractometer based on a sinusoidal grating
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Here we present a refractometer for liquids based on a sinusoidal relief grating immersed in a small cuvette. He – Ne light is sent to the cuvette + grating device where it is diffracted. Zero, +1 and -1 orders appear. It is possible to calibrate the device by measuring +1 order intensity, when different liquids with known refractive index are poured in the cuvette. A theoretical study has been developed that supports the experimental results.
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Sergio Calixto, Sergio Calixto, Neil C. Bruce, Neil C. Bruce, Martha Rosete-Aguilar, Martha Rosete-Aguilar, Areli Montes-Perez, Areli Montes-Perez, } "A refractometer based on a sinusoidal grating", Proc. SPIE 9948, Novel Optical Systems Design and Optimization XIX, 99480Z (30 September 2016); doi: 10.1117/12.2235300; https://doi.org/10.1117/12.2235300

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