Patent ID: 8958075
Filing Date: 2015-02-17
Classification: G01B,G02B

Abstract:
1. A swing-style demodulation device for measuring displacement information, comprising ( 1 ) a broadband light source, ( 2 ) an optical circulator, ( 3 ) GRIN lens, ( 4 ) a fixed mirror on an object under test, ( 5 ) a collimating device, ( 6 ) a rotating mirror, ( 7 ) f-θ lens, ( 8 ) a polarizer, ( 9 ) a narrow strip shaped birefringent wedge, ( 10 ) a polarization analyzer, ( 11 ) a signal acquisition system, wherein a light goes from said broadband light source to said optical circulator and then to said GRIN lens, which reflects a first part of the light itself and transmits a second part of the light to said fixed mirror where said second part of the light is reflected and then combined with said first part of the light into a combined light, and said combined light goes back to said optical circulator, then in turn to said collimating device, said rotating mirror, said f-θ lens, said polarizer, said narrow strip shaped birefringent wedge, and finally said polarization analyzer which is connected to said signal acquisition system for calculating displacement information of said object under test.