Patent ID: 11940302
Assignee: GUILIN GEMRED SENSOR TECHNOLOGY ASSIGNEE CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A method for displacement measurement for a sensing device, the sensing device comprising a first displacement sensor, and the method comprising:
outputting a drive signal to a first displacement sensor;
receiving and processing a signal from the first displacement sensor, and outputting a first ADSO signal;
receiving a CLK512 signal and the first ADSO signal, and timing or counting according to the CLK512 signal and the first ADSO signal, wherein the CLK512 signal is a square wave signal related to a period and phase of the drive signal; and
converting a first data obtained by timing or counting into an absolute displacement value of a gate of the first displacement sensor within a grating spacing;
wherein:
timing or counting according to the CLK512 signal and the first ADSO signal comprises:
timing or counting at the clock frequency starting from zero when a rising edge of the CLK512 signal is monitored; and
transmitting a current time or current count when a rising edge of the first ADSO signal is monitored; and

converting a first data obtained by timing or counting into an absolute displacement value of a gate of the first displacement sensor within a grating spacing comprises:
obtaining a position equivalent of the gate of the first displacement sensor within a grating spacing according to the first data obtained through timing and the clock frequency; and
converting the position equivalent of the gate of the first displacement sensor within a grating spacing to an absolute displacement value of the gate of the first displacement sensor within a grating spacing.