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

Claim 21:
22. 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;
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

the sensing device further comprises a second displacement sensor; the first displacement sensor comprises a plurality of grating spacings within one grating spacing of the second displacement sensor; and the method further comprises:
outputting the drive signal to the second displacement sensor;
receiving and processing a signal from the second displacement sensor and outputting a second ADSO signal;
receiving the second ADSO signal and the CLK512 signal, and timing or counting according to the second ADSO signal and the CLK512 signal and the clock frequency, thereby yielding a third data;
determining a number of the grating spacing of the displacement of the gate of the first displacement sensor according to the third data; and
obtaining a total absolute displacement value of the gate of the first displacement sensor according to the number of the grating spacing of the displacement of the gate of the first displacement sensor and the first data.