Vibration detection method and system, battery-less vibration sensor and interrogator therefor
First Claim
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1. A method for detecting a vibration status of a target object, comprising:
- attaching to the target object a battery-less vibration sensor provided with a single port surface acoustic wave (SAW) resonator, the battery-less vibration sensor being configured to sense the vibration status as mechanical vibration of the battery-less vibration sensor;
continuously transmitting a carrier wave signal to the single port SAW resonator;
continuously monitoring a wave signal reflected from the single port SAW resonator, the reflected wave signal including fluctuation caused by the mechanical vibration when the battery-less vibration sensor senses the vibration status; and
noticing the vibration status on the basis of the fluctuation.
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Abstract
A vibration detection system comprises a battery-less vibration sensor and an interrogator. The sensor comprises a single port surface acoustic wave resonator. The interrogator continuously transmits a carrier wave signal to the resonator while receiving a wave signal reflected from the resonator. The reflected wave signal includes components other than the transmitted carrier wave signal if the sensor senses a vibration event. Based the reflected wave signal, the interrogator judges whether the vibration event occurs.
36 Citations
28 Claims
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1. A method for detecting a vibration status of a target object, comprising:
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attaching to the target object a battery-less vibration sensor provided with a single port surface acoustic wave (SAW) resonator, the battery-less vibration sensor being configured to sense the vibration status as mechanical vibration of the battery-less vibration sensor;
continuously transmitting a carrier wave signal to the single port SAW resonator;
continuously monitoring a wave signal reflected from the single port SAW resonator, the reflected wave signal including fluctuation caused by the mechanical vibration when the battery-less vibration sensor senses the vibration status; and
noticing the vibration status on the basis of the fluctuation. - View Dependent Claims (2, 3)
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4. A vibration detection system comprising:
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a battery-less vibration sensor comprising a single port surface acoustic wave (SAW) resonator, the battery-less vibration sensor being attached to a target object upon actual use thereof and being configured to sense a vibration status of the target object as mechanical vibration of the battery-less vibration sensor; and
an interrogator configured to perform;
continuously transmitting a carrier wave signal to the single port SAW resonator;
continuously monitoring a wave signal reflected from the single port SAW resonator, the reflected wave signal including fluctuation caused by the mechanical vibration when the battery-less vibration sensor senses the vibration status; and
noticing the vibration status on the basis of the fluctuation. - View Dependent Claims (5, 6)
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7. A battery-less vibration sensor attachable to a target object, comprising:
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an antenna; and
a single port surface acoustic wave (SAW) resonator electrically connected to the antenna. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An interrogator usable in a vibration detection system comprising battery-less vibration sensor, the battery-less vibration sensor being attached to a target object upon actual use thereof and being configured to sense a vibration status of the target object as mechanical vibration of the battery-less vibration sensor, the interrogator comprising:
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a transmitter/receiver configured to continuously transmit a carrier wave signal to the battery-less vibration sensor and configured to continuously receive a wave signal reflected from the battery-less vibration sensor, the reflected wave signal including fluctuation caused by the mechanical vibration when the battery-less vibration sensor senses the vibration status; and
a judgment section coupled to the transmitter/receiver and configured to monitor the reflected wave signal to judge, on the basis of the fluctuation, whether the target object is in the vibration status. - View Dependent Claims (26, 27)
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28. A vibration detection system based on a radio frequency identification scheme, the vibration detection system comprising:
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an interrogator configured to continuously transmit a carrier wave signal; and
a battery-less vibration sensor configured to sense a vibration event by using electromagnetic energy of the carrier wave signal.
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Specification