Patent ID: 11965757
Assignee: GUILIN GUANGLU MEASURING INSTRUMENT CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 8:
9. The hybrid positioning electromagnetic induction displacement sensor according to claim 1, wherein:
after measuring, in parallel, phase quantization codes N1 and N2 with a measured position within two different pitches P1 and P2 encircled by a transmitter winding (1.3), a fine displacement xF=N1 (a pitch P1 is correspondingly referred to as a fine pitch PF), a mid-displacement xMm·(N2−N1), and mid-displacement increments ΔxM in two consecutive measurements are accumulated to obtain a total displacement xT=Σ(ΔxM), an integer number KM of mid-pitches contained in the total displacement xT is figured out according to a relationship xT≈KM·PM+xM, an integer number KF of fine pitches contained in the mid-displacement xM is figured out according to a relationship xM≈KF·PF+xF, and a measured displacement x without range limit is obtained according to a formula x=(m·KM+KF)·PF+xF; the following absolute positioning algorithm may also be used to map the mid-displacement xM to a half-closed interval [0, PM), an integer number KF of fine pitches contained in the mid-displacement xM is figured out according to a relationship xM≈KF·PF+xF, and a measured displacement x absolute positioned within the mid-pitch is obtained according to a formula x=KF·PF+xF; and
after measuring, in parallel, phase quantization codes N11 and N12 with a measured position within two different pitches P1 and P2 encircled by a first transmitter winding (1.4), and measuring, in parallel, phase quantization codes N21 and N23 with a measured position within two different pitches P1 and P3 encircled by a second transmitter winding (1.5), a fine displacement xF=N21 (a pitch P1 is correspondingly referred to as a fine pitch PF), a mid-displacement xM=m·(N12−N11), a coarse displacement xC=m·n·(N23−N21), the coarse displacement xC is mapped to a half-closed interval [0, PC), an integer number KM of mid-pitches PM contained in the coarse displacement xC is figured out according to a relationship xC≈KM·PM+xM, an integer number KF of fine pitches PF contained in the mid-displacement xM is figured out according to a relationship xM≈KF·PF+xF, an absolute displacement xa within the coarse pitch is obtained according to a formula xa=(m·KM+KF)·PF+xF, if a measuring range is not extended, the measured displacement x=xa, or a measured displacement x=Σ(Δxa) without range limit is obtained by accumulating absolute displacement increments Δxa in two consecutive measurements.