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

Claim 2:
3. The hybrid positioning electromagnetic induction displacement sensor according to claim 1, wherein the transceiver board (1) and the excitation board (2) may move relative to each other along a measurement axis; the transceiver board (1) is arranged with a transmitter winding (1.3) extending along the measurement axis and two three-phase receiver windings (1.1, 1.2) with different pitches; the transmitter winding (1.3) separately encircles the three-phase receiver winding (1.1) with a pitch of P1 and the three-phase receiver winding (1.2) with a pitch of P2 by using two approximately closed rectangular coils (1.3.1, 1.3.2) in the same direction in series; and the excitation board (2) is arranged with two rows of excitation coils (2.1, 2.2) extending along the measurement axis, the two rows of excitation coils and the two three-phase receiver windings (1.1, 1.2) on the transceiver board (1) having the same pitch and coincided center lines respectively, and a shape of the excitation coil is a rounded rectangular short-circuit loop; and
a spatial frequency difference between the pitches P2 and P1 is taken as a mid-pitch spatial frequency FM=1/P2−1/P1, to obtain a mid-pitch PM=1/FM=P1·P2/(P1−P2)=m·P1=(m+1)·P2 with a wavelength ratio of m.