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

Claim 11:
12. The piezoelectric device online detection method according to claim 11, wherein the correcting the contact pressure according to the comparison result comprises:
the environmental data comprising temperature data, comparing the temperature data with a preset temperature threshold; when the temperature data is greater than or equal to the preset temperature threshold, obtaining a capacitance of the elastic wave sensor through a following formula: C1(t)=a×t2+b×t+c(t≥t0); and when the temperature data is less than the preset temperature threshold, obtaining a capacitance of the elastic wave sensor through a following formula: C2(t)=l×t2+m×t+n(t<t0), wherein C1(t) and C2(t) are capacitances of the elastic wave sensor; t is an ambient temperature; a, b, c, l, m, and n are constants; and
calculating and obtaining a corrected contact pressure according to the capacitance of the elastic wave sensor, the contact pressure, and a compensation coefficient through a compensation function which comprises: P=P1+x−y×z, wherein P is the corrected contact pressure; P1 is the contact pressure obtained by a control chip according to the detection signal; z is the capacitance of the elastic wave sensor; x and y are preset compensation coefficients.