Wireless chipless printed sensor tag for real-time radiation sterilization monitoring
AssigneePurdue Research Foundation
InventorsRahim Rahimi, Ulisses Heredia Rivera, Sarath Gopalakrishnan
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Abstract
A system may receive a package previously irradiated for sterilization. The package may have a sensor comprising a reference tag and sensing tag at least partially coated with a material comprising poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and Polyurethan (PU). The system may scan the sensing tag and the reference tag. The system may determine, based on radio frequency (RF) signals reflected from the sensing tag and reference tag, the sensor is exposed to radiation. The system may output a quality measure indicative of the sensor being exposed to radiation.
Claims15
A method comprising:
- receiving a package previously irradiated for sterilization, the package having a sensor comprising a reference tag and a sensing tag, the sensing tag at least partially coated with a material comprising poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and Polyurethane (PU), wherein the resonant frequency of the sensing tag is different from the resonant frequency of the reference tag;
- scanning the sensing tag and the reference tag during a same interrogation operation;
- measuring a
- first peak amplitude of a reflected power from the sensing tag at the resonant frequency of the sensing tag;
- measuring a second peak amplitude of a reflected power from the reference tag at the resonant frequency of the reference tag;
- and
- outputting, based on a comparison of the first peak amplitude at the resonant frequency of the sensing tag and the second peak amplitude at the resonant frequency of the reference tag, a quality measure indicative of the sensor being exposed to radiation.
A method, comprising:
- printing a reference tag and a sensing tag onto a substrate, the sensing tag having an interdigitated electrode (IDE), the reference tag and sensing tag not touching;
- and
- coating the IDE of the sensing tag with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and Polyurethane (PU),
- wherein the sensing tag and the reference tag are dimensioned to have isolated resonant frequencies to provide distinct resonant responses.
A radiation sensor, comprising:
- a substrate;
- a reference tag located on a surface of the substrate;
- and
- a sensing tag located on the surface of the substrate separate from the reference tag, the sensing tag having an interdigitated electrode (IDE) coated in a radiation sensitive material which causes conductivity across the interdigitated electrode to decrease in response to exposure to radiation, wherein the sensing tag and the reference tag are dimensioned to have isolated resonant frequencies to provide distinct resonant responses.
Dependencies are inferred from the claim text.