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 17:
18. The heterodyne one-dimensional grating measuring method according to claim 14, wherein the +1-order diffracted light and the −1-order diffracted light generated by the diffraction of the one-dimensional measuring grating are respectively incident to a first right-angle prism and a second right-angle prism; the first right-angle prism and the second right-angle prism respectively perform secondary reflection on the +1-order diffracted light and the −1-order diffracted light, so that the +1-order diffracted light and the −1-order diffracted light are incident on the surface of the one-dimensional measuring grating again at a diffracted exit angle; and two beams of new diffracted light are vertically incident to the polarized beam splitting prism.