Method for the rapid interrogation of a passive sensor, in particular of the surface acoustic waves type, and system for measuring the unique frequency of such a sensor
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United States of America Patent
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Oct 10, 2017
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Sep 11, 2014
app pub date -
Oct 19, 2012
filing date -
Oct 21, 2011
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Abstract
For passive sensor with resonator having a natural frequency, a method comprises: a first phase emission of an electromagnetic signal toward the passive sensor at an emission frequency, the resonator oscillating in a forced regime at the emission frequency and then oscillating at its natural frequency when the emission is cut off; a first phase reception of the damped signal oscillating at natural frequency emitted by passive sensor, a measurement of the frequency being performed; a second phase emission of an electromagnetic signal at the measured frequency toward the passive sensor, the resonator oscillating in a forced regime at the measured frequency and then oscillating at its natural frequency when the emission is cut off; a second phase reception of the damped signal oscillating at natural frequency, a measurement of the frequency being performed, determination of the natural frequency being stopped due to measurement performed in this second reception phase.
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