Patent ID: 7920269
Filing Date: 2011-04-05
Classification: G01B

Abstract:
1. A system for measuring interferences, comprising: a first source, said first source being a first single-frequency light source; an optical delay line device, delaying beams by an optical phase modulation; a first detect device, said first detect device being a first interferometer; a second detect device, said second detect device being a second interferometer; and an optical path module, comprising a plurality of paths for beams to pass through, wherein said plurality of paths comprise: wherein the length of said fourth path is changed by said optical phase modulation so as to shift the phase of a first interference signal between the beam passing through said second path and the beam passing through said fourth path, and said first detect device receives and detects the phase shift of said first interference signal; wherein the length of said fifth path is changed by said optical phase modulation so as to shift the phase of a second interference signal between the beam passing through said fifth path and the beam passing through said sixth path, and said second detect device receives and detects the phase shift of said second interference signal.