Wireless sensing devices and method for detecting hydration
First Claim
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1. An RF hydration sensor in an assembly, comprising:
- a substrate;
an antenna disposed on the substrate;
an RF circuit electrically coupled to the antenna, the RF circuit comprising a processor;
a thermal source electrically coupled to the RF circuit for changing a thermal condition of a target area; and
a sensing element thermally coupled to the thermal source for sensing a temperature of the thermal source, such that when the thermal source is thermally coupled to the target area, the RF hydration sensor wirelessly receives a first power having a first form from a transceiver, the RF circuit transforms the first power to a second power having a second form different from the first form and delivers the second power to the thermal source, the sensing element senses a time variation of the thermal source temperature, and the processor determines a hydration indicator indicating a hydration level of the target area based on the sensed time variation of the thermal source temperature.
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Abstract
At least some aspects of the present disclosure feature an RF hydration sensor in an assembly, comprises a substrate; an antenna disposed on the substrate; an RF circuit electrically coupled to the antenna; a thermal source electrically coupled to the RF circuit for changing a thermal condition of a target area; and a sensing element thermally coupled to the thermal source for sensing a temperature of the thermal source. The RF hydration sensor wirelessly receives a power from a remote transceiver and provides at least part of the power to the thermal source.
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Citations
11 Claims
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1. An RF hydration sensor in an assembly, comprising:
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a substrate; an antenna disposed on the substrate; an RF circuit electrically coupled to the antenna, the RF circuit comprising a processor; a thermal source electrically coupled to the RF circuit for changing a thermal condition of a target area; and a sensing element thermally coupled to the thermal source for sensing a temperature of the thermal source, such that when the thermal source is thermally coupled to the target area, the RF hydration sensor wirelessly receives a first power having a first form from a transceiver, the RF circuit transforms the first power to a second power having a second form different from the first form and delivers the second power to the thermal source, the sensing element senses a time variation of the thermal source temperature, and the processor determines a hydration indicator indicating a hydration level of the target area based on the sensed time variation of the thermal source temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An RF sensor for measuring a liquid level, comprising:
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a substrate; an antenna disposed on the substrate; an RF circuit electrically coupled to the antenna, the RF circuit comprising a processor; an absorption element comprising an absorption material, a thermal source electrically coupled to the RF circuit and thermally coupled to the absorption element; and a sensing element thermally coupled to the thermal source for sensing a temperature of the thermal source, such that after the absorption element is used to absorb a liquid, the RF sensor wirelessly receives a first power having a first form from a transceiver, the RF circuit transforms the first power to a second power having a second form different from the first form and delivers the second power to the thermal source, the sensing element senses a time variation of the thermal source temperature, and the processor determines an indicator indicating a liquid level based on the sensed time variation of the thermal source temperature. - View Dependent Claims (10, 11)
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Specification