Patent ID: 11860057
Assignee: CHANGCHUN INSTITUTE OF OPTICS, FINE MECHANICS AND PHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. The heterodyne one-dimensional grating measuring method according to claim 14, wherein the photoelectric receiving module comprises a first receiver and a second receiver; the first receiver receives the second polarized light component of the −1-order diffracted light and the first polarized light component of the +1-order diffracted light, generates a beat frequency signal having a frequency of fB-fA, and transmits the beat frequency signal to the signal processing device; and the second receiver receives the first polarized light component of the −1-order diffracted light and the second polarized light component of the +1-order diffracted light, generates a beat frequency signal having a frequency of fB-fA, and transmits the beat frequency signal to the signal processing device.