Radio frequency identification sensor assembly
First Claim
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1. A method for detecting properties or conditions of an environment comprising:
- overlaying a sensing material onto a surface of a first RFID chip having a structure to form a RFID sensor,configuring the first RFID chip to function as an optical sensor;
introducing a second RFID chip that has an inert material and the second RFID chip is part of the structure of the first chip;
configuring the sensing material to function as a variable light filter that filters light differently depending upon the properties or conditions of the environment surrounding the RFID sensor;
directing light from a light source towards the RFID sensor and the second chip and the light source is selectively operated by an RFID reader wherein the RFID reader periodically activates the light source to monitor the change in a condition or parameter over time and an amount of light permitted through to the sensing material is a function of a presence or concentration of the sensed condition or parameter; and
detecting the response of the RFID sensor and looking at the difference between a response from each of the first and second chip in response to the light.
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Abstract
An RFID sensor comprises an RFID chip, an antenna, and sensing material. The RFID chip is in electrical communication with the antenna and comprises an optical sensor. The sensing material overlies an upper surface of the RFID chip and is configured as a variable light filter that filters light differently depending upon certain properties or conditions of the environment surrounding the RFID sensor. A light source is configured to selectively illuminate the sensing material to facilitate detection of certain properties or conditions of the environment surrounding the RFID sensor.
15 Citations
20 Claims
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1. A method for detecting properties or conditions of an environment comprising:
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overlaying a sensing material onto a surface of a first RFID chip having a structure to form a RFID sensor, configuring the first RFID chip to function as an optical sensor; introducing a second RFID chip that has an inert material and the second RFID chip is part of the structure of the first chip; configuring the sensing material to function as a variable light filter that filters light differently depending upon the properties or conditions of the environment surrounding the RFID sensor; directing light from a light source towards the RFID sensor and the second chip and the light source is selectively operated by an RFID reader wherein the RFID reader periodically activates the light source to monitor the change in a condition or parameter over time and an amount of light permitted through to the sensing material is a function of a presence or concentration of the sensed condition or parameter; and detecting the response of the RFID sensor and looking at the difference between a response from each of the first and second chip in response to the light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification