18 August 2014 An interferometric humidity sensor based on a thin gelatin film
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Gelatin thin films inserted in a Mach – Zehnder interferometer were used to monitor Relative Humidity (RH). When RH varied, gelatin film thickness and refractive index also changed. As a result interference pattern moved horizontally. A fixed detector, with a pinhole in front of it, was placed at the interference pattern. It sampled the pattern when it moved. These intensity values were used to find a calibration plot relating intensity as a function of RH.
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Sergio Calixto, Sergio Calixto, Areli Montes-Perez, Areli Montes-Perez, "An interferometric humidity sensor based on a thin gelatin film", Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 920318 (18 August 2014); doi: 10.1117/12.2063295; https://doi.org/10.1117/12.2063295

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