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 11:
12. The heterodyne one-dimensional grating measuring device according to claim 7, wherein the reading head further comprises a first right-angle prism and a second right-angle prism, the first right-angle prism and the second right-angle prism are respectively disposed on the diffracted light path of the one-dimensional measuring grating, the first right-angle prism and the second right-angle prism respectively perform secondary reflection the +1-order diffracted light and the −1-order diffracted light, 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.