access icon openaccess Smart radio-frequency identification tag for diaper moisture detection

A passive smart tag is described that responds to dampness in diapers once a pre-defined threshold value is reached. A high-frequency (HF) system at 13.56 MHz is used as this allows operation through water or human tissues with less absorption that would occur for an ultra-HF signal. A circular spiral coil and swelling substrate facilitate a reaction to dampness that can be detected without contact to the diaper wearer. A prototype design is simulated and measured results are provided together with a demonstration of a tag integrated into a worn diaper.

Inspec keywords: biomedical equipment; skin; coils; radiofrequency identification; body sensor networks; intelligent sensors; moisture measurement

Other keywords: swelling substrate; water; frequency 13.56 MHz; smart radiofrequency identification tag; circular spiral coil; passive smart tag; human tissues; high-frequency system; diaper moisture detection; diaper dampness; ultraHF signal; prototype design; predefined threshold value

Subjects: Humidity measurement; Biomedical communication; RFID systems; Wireless sensor networks; Sensing and detecting devices; Intelligent sensors; Biomedical measurement and imaging; Patient diagnostic methods and instrumentation

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