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

Claim 12:
13. The piezoelectric device online detection method according to claim 10, wherein the calculating and obtaining the contact pressure, generated when the external contact occurs, according to the calibration coefficient and the detection signal for detecting a contact comprises:
when the self-check signal is less than a reference value, obtaining a capacitance of the elastic wave sensor corresponding to the self-check result through a following formula: f=a×c+β, wherein f is a frequency of the self-check signal, c is the capacitance of the elastic wave sensor, α and β are constants; and
calculating and obtaining a corrected contact pressure according to the capacitance of the elastic wave sensor, the contact pressure, and the calibration coefficient through a calibration function which comprises: P=P1+x−y×c, wherein P is the corrected contact pressure, P1 is the contact pressure obtained by a control chip according to the detection signal, c is the capacitance of the elastic wave sensor, and x and y are preset calibration coefficients which are constants.