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A continuous monitoring of critical environmental parameters to detect threshold or dosage violations is of strong interest throughout the life cycle of goods. The task is challenging, when there is no continuous supply of electric energy available and lowest cost sensor solutions are required - two common application constraints in wireless passive sensor applications, i.e., sensor enhanced RFID...
A wireless passive sensor solution is presented, which permits continuous monitoring of a humidity threshold viola- tion, but does not require a permanent supply of electric energy. It is based on an inkjet printed resistance changing element, which incorporates three mechanisms: the deliquescent behavior of salts, transport processes in porous media and chemical sintering of silver nanoparticles...
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