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By using a dielectric elastomer (DE) sensor and observing the change in capacitance due to the amount of water, the amount of change in water can be measured more accurately. Further, since it is flexible, it offers excellent wearability as a sensor attached to the body, or is excellent comfort as an unobtrusive sensor attached to a chair. Also, since this sensor does not use metal leads, there is no risk of rust or metal allergies. The principle is simple; the frequency changes due to the change in the capacitance of DE (capacitor), making it is possible to measure moisture by the change. An inexpensive elastomer can be used for the dielectric, and carbon black, CNT, or the like can be used for the stretchable electrode.
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