Title: Vibration detection method and system, battery-less vibration sensor and interrogator therefor
Application Number: 200610172870 Application Date: 2006.11.08
Publication Number: 1975794 Publication Date: 2007.06.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G08B13/04;G08B13/16;G01H1/00
Applicant(s) Name: NEC Tokin Corp. Address:
Inventor(s) Name: Hayasaka Junichi;Tanaka Kazumi;Sasaki Atsushi;Fuji
Attorney & Agent: wangbei bei
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.
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