Water Vapor Sensors Based on the Swellingof Relief Gelatin Gratings: Recent Advances and Development

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India BP International
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Water Vapor Sensors Based on the Swelling of Relief Gelatin Gratings: Recent Advances and Development

We report on a novel device to measure relative humidity. Materials used in the measurement of relative humidity are of different kinds. The sensor is based on surface diffraction gratings made of gelatin. This material swells and shrinks according to the content of water vapor in air. By sending a light beam to the grating, diffracted orders appear. Due to the gelatin swelling or shrinking, first order intensity changes according to the relative humidity. Calibration curves relating intensity versus relative humidity have been found. The fabrication process of diffraction gratings and the testing of the prototype sensing devices are described.



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