Patent ID: 11959797
Assignee: BEIJING TAIFANG TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. The piezoelectric device online detection method according to claim 15, wherein the determining that the corresponding sensor, for which the signal amplitude difference is detected, is the damaged sensor comprises:
detecting a sensor q, if a second measured signal amplitude A2q shown in the second sampling result is less than a signal amplitude threshold Ath2, detecting that the sensor q is a damaged sensor, recording the signal amplitude threshold Ath2 and the second measured signal amplitude A2q , and calculating a signal amplitude difference H2q between the signal amplitude threshold Ath2 and the second measured signal amplitude A2q , if H2q is equal to H, determining that the damaged sensor in the group of parallel sensors is the sensor q, and ending; otherwise, if H2q is less than H, detecting a sensor p, if a second measured signal amplitude Alp shown in the second sampling result is less than the signal amplitude threshold Ath2, detecting that the sensor p is a damaged sensor, recording the signal amplitude threshold Ath2 and the second measured signal amplitude Alp, and calculating a signal amplitude difference H2p between the signal amplitude threshold Ath2 and the second measured signal amplitude Alp, if (H2p+H2q) is equal to H, determining that damaged sensors in the group of parallel sensors are the sensor q and the sensor p, and ending; otherwise, if (H2p+H2q) is less than H, continuing to poll and detect the sensors in the group of parallel sensors until a sum of detected signal amplitude differences is equal to H, and determining that a corresponding sensor, for which a signal amplitude difference is detected, is a damaged sensor;
wherein when the excitation signal is given, if each sensor i in the parallel sensors works normally, then a second measured signal amplitude A2i shown in the second sampling result is the signal amplitude threshold Ath2, wherein i is 1 to n, n is a quantity of sensors in the group of parallel sensors, and p and q each is any one of the n sensors.