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 14:
15. The heterodyne one-dimensional grating measuring method according to claim 14, wherein a thickness of the compensating mirror is equal to ½ length of the reflecting prism, the compensating mirror is configured to compensate a transmission optical path of the second polarized light component of the +1-order diffracted light and the second polarized light component of the −1-order diffracted light, so that the transmission optical path of the second polarized light component of the +1-order diffracted light and the second polarized light component of the −1-order diffracted light is equal to a transmission optical path of the first polarized light component of the +1-order diffracted light and the first polarized light component of the −1-order diffracted light.