Wireless sensor diaper and its monitoring equipment

Abstract

The invention provides a wireless induction diaper and its monitoring equipment, wherein the wireless induction diaper comprises: a diaper and a frequency-shifting radio frequency identification tag, wherein the diaper has an absorbing layer for absorbing liquid, and the frequency-shifting radio frequency identification tag The identification tag includes: a chip and an antenna electrically connected to the chip, wherein the antenna at least includes an extended antenna, and the reading frequency band of the antenna is deviated from the reading frequency band of the monitoring equipment in normal conditions, and the antenna is arranged on a water-absorbable base The surface of the material, the extended antenna and the water-absorbable substrate are in contact with the absorbent layer of the diaper. The water-absorbable substrate can be wetted after the absorbent layer absorbs urine or moisture, thereby changing the dielectric coefficient of the antenna substrate itself , and shift the reading frequency band of the antenna to the reading frequency band of the monitoring device, and the monitoring device sends a notification message indicating that the diaper is wet.

Description

technical field [0001] The invention relates to a diaper, especially a wireless induction diaper equipped with a frequency-shifting radio frequency identification tag and its monitoring equipment, which can be read by the monitoring equipment after the diaper absorbs urine or water, and then the monitoring equipment sends a notification The message indicates that the diaper is wet. Background technique [0002] Traditional diapers only have the function of absorbing urine or water, and do not have the function of proactively notifying that the diaper is wet. In addition, there is also a known diaper that can remind others that the diaper is wet by changing the appearance color of the diaper after absorbing urine or water; The paper diaper with detection function can be used with a radio frequency reader, and the paper diaper with sensing function includes: an absorbent pad, a sensing wire set and a radio frequency identification tag. The absorbent pad has two waist sides l...

AI Technical Summary

Problems solved by technology

The aforementioned another known technology I533857 utilizes when the diaper body is in a wet state, because the change of the dielectric coefficient of the waterproof layer of the diaper will cause the impedance value of the metal antenna to change accordingly, thereby causing the radio frequency tag to transmit The wavelength of the electromagnetic wave signal changes. Although this technical means is different from the known technology CN103845156, the radio frequency of the radio frequency tags currently used by the people is mostly in the ultra-high frequency band. The wavelength of high-frequency radio waves is small, and it is not easy to pass through water molecules. , so water molecules absorb electromagnetic waves in this frequency band, so that when the original normal UHF label is attached to the water-containing background material, the label antenna and water form a large absorber, so the antenna cannot effectively receive electromagnetic waves. At this time, the transmission distance will get very short

Therefore, when the aforementioned known technology I533857 utilizes the diaper body as a wet state, the reading distance of the metal antenna will change from long to long due to the change of the dielectric coefficient of the diaper’s waterproof layer itself and the influence of water absorbing ultra-high frequency electromagnetic waves. Short, which uses the change of the distance of the radio frequency tag from long to short when the diaper is wet to let the reader issue an alarm

As mentioned above, when the diaper is full of water, the water will absorb electromagnetic waves. However, the transmission distance will decrease at this time, which will cause the signal to disappear. Therefore, it is impossible to judge whether the interruption is caused by the full absorption of water or other factors. In addition, such Design, the reader can read the signal of the radio frequency tag at the beginning; because the reader will continue to receive signal processing, this will cause the reader chip to overheat quickly and affect the reading performance

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