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- W2909588663 abstract "The use of electronic devices to measure Relative Humidity (RH) is widespread. However, under certain circumstances, for example when explosive gases are present, a spark-free method should be used. Here we suggest the use of stimuli-responsive materials, like gelatin and interpenetrated polymers, to detect RH with an optical method. These materials are hydrophilic. When water vapor is absorbed by the films the molecules attach to the films molecular network. The result is that the film thickness increases and their refractive index changes. To detect the change of these two parameters an optical method based on diffraction gratings is employed. Surface diffraction gratings are recorded on the films. Then gratings are placed in an optical configuration that is immersed in a climatic chamber. A light beam is sent to the grating where it is diffracted. Several light orders appear. Due to the absorption of water molecules the films swell and grating surface modulation changes. This implies that the diffracted orders intensity changes. A calibrating plot relating intensity as a function of RH is obtained." @default.
- W2909588663 created "2019-01-25" @default.
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- W2909588663 date "2019-01-21" @default.
- W2909588663 modified "2023-09-27" @default.
- W2909588663 title "Stimuli-Responsive Systems in Optical Humidity-Detection Devices" @default.
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- W2909588663 doi "https://doi.org/10.3390/ma12020327" @default.
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