Method for temperature measurement
First Claim
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1. A method for measuring temperature comprising the steps of:
- performing a frequency variation of a single local oscillator of a RFID tag by varying a transmission timing sequence associated with the single oscillator of the RFID tag, the RFID tag having different timings;
measuring the frequency variation at the single local oscillator of the RFID tag by measuring a first backscattered frequency and a second backscattered frequency with respect to backscattered signals from the RFID tag using information of the single local oscillator in the RFID tag, wherein the second backscattered frequency is less than the first backscattered frequency;
determining an RFID tag ring oscillator frequency using the first backscattered frequency and the second backscattered frequency; and
determining an RFID tag temperature using, in part, a linear dependency of the RFID tag ring oscillator frequency.
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Abstract
This document describes a method for measuring temperature. In accordance with the invention the temperature is determined from frequency variation of a local oscillator of a RFID tag (1).
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Citations
8 Claims
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1. A method for measuring temperature comprising the steps of:
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performing a frequency variation of a single local oscillator of a RFID tag by varying a transmission timing sequence associated with the single oscillator of the RFID tag, the RFID tag having different timings; measuring the frequency variation at the single local oscillator of the RFID tag by measuring a first backscattered frequency and a second backscattered frequency with respect to backscattered signals from the RFID tag using information of the single local oscillator in the RFID tag, wherein the second backscattered frequency is less than the first backscattered frequency; determining an RFID tag ring oscillator frequency using the first backscattered frequency and the second backscattered frequency; and determining an RFID tag temperature using, in part, a linear dependency of the RFID tag ring oscillator frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for measuring temperature comprising the steps of:
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performing a frequency variation of a single local oscillator of a RFID tag by varying a transmission timing sequence associated with the single oscillator of the RFID tag, the RFID tag having different timings; measuring the frequency variation at the single local oscillator of the RFID tag by measuring a first backscattered frequency and a second backscattered frequency with respect to backscattered signals from the RFID tag using information of the single local oscillator in the RFID tag, wherein the second backscattered frequency is less than the first backscattered frequency; determining an RFID tag ring oscillator frequency using the first backscattered frequency and the second backscattered frequency; and determining an RFID tag temperature using, in part, a linear dependency of the RFID tag ring oscillator frequency, wherein the RFID tag temperature is determined using only the single local oscillator of the RFID tag.
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Specification