Sensor having ferrogel with magnetic particles
First Claim
1. A sensor for detecting a condition, the sensor comprising:
- a container;
a hydrogel arranged within the container and configured to change thickness or volume in response to the condition;
a plurality of magnetic particles arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel; and
a device coil arranged within the container and arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor, wherein terminals of the device coil are open.
2 Assignments
0 Petitions
Accused Products
Abstract
A sensor for detecting a condition includes a hydrogel configured to change thickness or volume in response to the condition. Magnetic particles are arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. Some such sensors include a magnetic-field detector that measures the magnetic field of the hydrogel. Other such sensors include a device coil is arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A sensing system using such a sensor includes a reader spaced apart from the sensor and including a reader coil and a resonance detector coupled to the reader coil to detect a the resonant frequency of the sensor. Changes in the magnetic property detectably modulate the resonant frequency.
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Citations
15 Claims
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1. A sensor for detecting a condition, the sensor comprising:
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a container; a hydrogel arranged within the container and configured to change thickness or volume in response to the condition; a plurality of magnetic particles arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel; and a device coil arranged within the container and arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor, wherein terminals of the device coil are open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification