| 摘要 |
A polarization imaging apparatus measures the Stokes image of a sample. The apparatus consists of an optical lens set 11 , a linear polarizer 14 with its optical axis 18 , a first variable phase retarder 12 with its optical axis 16 aligned 22.5° to axis 18 , a second variable phase retarder 13 with its optical axis 17 aligned 45° to axis 18 , a imaging sensor 15 for sensing the intensity images of the sample, a controller 101 and a computer 102 . Two variable phase retarders 12 and 13 were controlled independently by a computer 102 through a controller unit 101 which generates a sequential of voltages to control the phase retardations of VPRs 12 and 13 . A set of four intensity images, I<SUB>0</SUB>, I<SUB>1</SUB>, I<SUB>2 </SUB>and I<SUB>3 </SUB>of the sample were captured by imaging sensor 15 when the phase retardations of VPRs 12 and 13 were set at (0,0), (pi,0), (pi,pi) and (pi/2,pi), respectively Then four Stokes components of a Stokes image, S<SUB>0</SUB>, S<SUB>1</SUB>, S<SUB>2 </SUB>and S<SUB>3 </SUB>were calculated using the four intensity images.
|
