Patent ID: 11946739
Assignee: WEIHAI HUALING OPTO-ELECTRONICS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The thickness detection method according to claim 2, wherein the common unit comprises a first conductor and a second conductor insulated from each other, or the common unit comprises an annular sleeve and a third conductor insulated from each other, the annular sleeve is a conductive sleeve, the second electric conductor and the conductive sleeve are defined as a first preset conductor, the first conductor and the third conductor are defined as a second preset conductor, the detection voltages comprise a first detection voltage and a second detection voltage, and before applying the detection voltage to the common unit, the detection method further comprises:
applying the first detection voltage to the first preset conductor;
controlling the detection device to perform dummy scan, and outputting a plurality of third voltage signals by a plurality of thickness detection chips of the detection unit which is corresponding to the first preset conductor;
placing a preset sample in the gap between the common unit and the detection unit, controlling the preset sample to move, wherein a moving direction of the preset sample is perpendicular to the second direction, detecting the preset sample, and outputting a plurality of fourth voltage signals by the plurality of thickness detection chips corresponding to the first preset conductor;
acquiring a first average value and a second average value, wherein the first average value is an average value of the plurality of third voltage signals, and the second average value is an average value of the plurality of fourth voltage signals;
applying a second preliminary voltage to the second preset conductor, wherein the second preliminary voltage is greater than the first measurement voltage;
controlling the detection device to perform dummy scan, and outputting a plurality of fifth voltage signals by a plurality of thickness detection chips corresponding to the second preset conductor;
placing the preset sample in the gap between the common unit and the detection unit, controlling the preset sample to move, wherein the moving direction of the preset sample is perpendicular to the second direction, and outputting a plurality of sixth voltage signals by the plurality of thickness detection chips corresponding to the second preset conductor;
acquiring a third average value and a fourth average value, wherein the third average value is an average value of the plurality of fifth voltage signals, and the fourth average value is an average value of the plurality of sixth voltage signals; and
adjusting the second preliminary voltage until a second difference value is equal to a first difference value, wherein under a condition that the second preliminary voltage is the second detection voltage, the first difference value is a difference value between the first average value and the second average value, and the second difference value is a difference value between the third average value and the fourth average value.