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Title: Polarization imaging apparatus with auto-calibration

Abstract

A polarization imaging apparatus measures the Stokes image of a sample. The apparatus consists of an optical lens set, a first variable phase retarder (VPR) with its optical axis aligned 22.5.degree., a second variable phase retarder with its optical axis aligned 45.degree., a linear polarizer, a imaging sensor for sensing the intensity images of the sample, a controller and a computer. Two variable phase retarders were controlled independently by a computer through a controller unit which generates a sequential of voltages to control the phase retardations of the first and second variable phase retarders. A auto-calibration procedure was incorporated into the polarization imaging apparatus to correct the misalignment of first and second VPRs, as well as the half-wave voltage of the VPRs. A set of four intensity images, I.sub.0, I.sub.1, I.sub.2 and I.sub.3 of the sample were captured by imaging sensor when the phase retardations of VPRs 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, S.sub.1, S.sub.2 and S.sub.3 were calculated using the four intensity images.

Inventors:
; ;
Issue Date:
Research Org.:
Boston Applied Technologies, Inc. (Woburn, MA)
Sponsoring Org.:
USDOE
OSTI Identifier:
1093262
Patent Number(s):
8,514,380
Application Number:
12/763,173
Assignee:
Boston Applied Technologies, Inc. (Woburn, MA)
DOE Contract Number:  
FG02-08ER85109
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Zou, Yingyin Kevin, Zhao, Hongzhi, and Chen, Qiushui. Polarization imaging apparatus with auto-calibration. United States: N. p., 2013. Web.
Zou, Yingyin Kevin, Zhao, Hongzhi, & Chen, Qiushui. Polarization imaging apparatus with auto-calibration. United States.
Zou, Yingyin Kevin, Zhao, Hongzhi, and Chen, Qiushui. Tue . "Polarization imaging apparatus with auto-calibration". United States. https://www.osti.gov/servlets/purl/1093262.
@article{osti_1093262,
title = {Polarization imaging apparatus with auto-calibration},
author = {Zou, Yingyin Kevin and Zhao, Hongzhi and Chen, Qiushui},
abstractNote = {A polarization imaging apparatus measures the Stokes image of a sample. The apparatus consists of an optical lens set, a first variable phase retarder (VPR) with its optical axis aligned 22.5.degree., a second variable phase retarder with its optical axis aligned 45.degree., a linear polarizer, a imaging sensor for sensing the intensity images of the sample, a controller and a computer. Two variable phase retarders were controlled independently by a computer through a controller unit which generates a sequential of voltages to control the phase retardations of the first and second variable phase retarders. A auto-calibration procedure was incorporated into the polarization imaging apparatus to correct the misalignment of first and second VPRs, as well as the half-wave voltage of the VPRs. A set of four intensity images, I.sub.0, I.sub.1, I.sub.2 and I.sub.3 of the sample were captured by imaging sensor when the phase retardations of VPRs 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, S.sub.1, S.sub.2 and S.sub.3 were calculated using the four intensity images.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {8}
}

Patent:

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