Method and system for detecting moisture at an absorbent article

摘要

A system is provided for detecting moisture at an absorbent article. The system includes a device arranged to be attached on the absorbent article and a resonance circuit including a moisture sensitive part, wherein the resonance circuit has a first resonance frequency when the moisture sensitive part is in a dry condition and a second resonance frequency when the moisture sensitive part is in a moist condition. The system further includes a monitoring unit being arranged to transmit a test signal to the device, receive a response signal from the device, determine a frequency of the response signal and generate a detection signal if the determined frequency corresponds to the second resonance frequency. There is also provided a method for detecting moisture at a device attached on an absorbent article.

主权项

1. A system for detecting moisture at an absorbent article, the system comprising:
a device arranged to be attached on the absorbent article and comprising a resonance circuit including a moisture sensitive part, wherein the resonance circuit has a first resonance frequency when the moisture sensitive part is in a dry condition and a second resonance frequency when the moisture sensitive part is in a moist condition, and a monitoring unit arranged to,
transmit a test signal to the device,receive a response signal from the device,determine a frequency of the response signal, andgenerate a detection signal if the determined frequency corresponds to the second resonance frequency, wherein the moisture sensitive part includes two conductors separated by an insulator, and the device further includes an electrically insulating layer having a first side and a second side, said two conductors are provided on the first side, the moisture sensitive part further includes a third conductor provided on the second side opposite to the two conductors and arranged to be capacity-coupled to the two conductors, and the third conductor is galvanically isolated from said two conductors.