&lt;title&gt;Computed-tomography imaging spectropolarimeter (CTISP): instrument concept, calibration, and results&lt;/title&gt;

Miles, Brian H.; Goodson, Ricky A.; Dereniak, Eustace L.; Descour, Michael R.

doi:10.1117/12.366333

Cited by 4 publications

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“…However, the imaging frame rate of the polarization imaging systems with rotating polarizers is very low, and the detection ability when applied to dynamic scenes is insufficient due to factors such as the low rotation speed of the polarizer and the solution method of polarization images. In the early days, the start-stop mode of the rotating polarizer was used in the polarization imaging systems of division-of-time to realize the modulation of polarization information [8][9] , which took a long time to complete a polarization measurement and was not suitable for the rapid change of the measured target. In recent years, a pipelined processing flow has emerged to improve the polarization imaging frame rate of the type of rotating polarizer [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Design and verification of fast-rotating polarization imaging system in dynamic scenes

Xie,

Luo,

et al. 2023

AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; And Biomedical Optics

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Section: Introductionmentioning

confidence: 99%

Design and verification of fast-rotating polarization imaging system in dynamic scenes

Xie,

Luo,

et al. 2023

AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; And Biomedical Optics

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“…Specifically, NS-CTISP is a patent pending 13 snapshot imaging version of CTISP, 14,15,16 a sequential imaging spectropolarimeter that was a polarimetric extension to the Computed Tomography Imaging Spectrometer (CTIS), previously developed by Descour and Dereniak 17,18 . The purpose of the Non-Scanning Computed Tomography Imaging Spectropolarimeter (NS-CTISP) is to provide a snapshot imaging capability to measure an object's spectral and polarimetric signature.…”

Section: Introductionmentioning

confidence: 99%

Nonscanning computed tomography imaging spectropolarimeter (NS-CTISP): design and calibration

Miles

Kim

2004

SPIE Proceedings

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The Non-Scanning Computed Tomography Imaging Spectropolarimeter (NS-CTISP) is a novel imaging spectropolarimeter developed for snapshot imaging and collection of the four Stokes hyper-cubes. The patent pending NS-CTISP builds upon the computed tomography concepts proven in earlier imaging spectrometers and imaging spectropolarimeters by utilizing a combination of two-dimensional spectral dispersion and division of aperture polarization analysis to acquire all data necessary to estimate the Stokes hyper-cubes without scanning in spatial, spectral or polarimetric dimensions. A custom quadrant polarization analyzer and tetrahedron prism are used in tandem to perform aperture division and polarization analysis on each of the four pupils. Equations are developed which link the computed tomography spectral reconstruction and polarimetric calibration allowing the determination of Stokes vectors at each waveband. NS-CTISP is spectrally and polarimetrically calibrated by measuring the system's spectral and polarimetric response to a radiating object having a small spatial extent, limited spectral bandwidth and a pure polarization state using a monochromator, fiber and polarization state generator. Iterative techniques are used to solve a linear imaging equation, where the solution provides input into the polarization calibration. Preliminary estimates of calibration fundamental accuracy indicates the average Stokes parameter error for central wavebands is on the order of 1.4-1.8 percent. A simple pseudo-object is created using two different fiber images each having a different polarization and reconstructed with average Stokes parameter error ranging from 0.7% to 3.2%. A suite of data acquisition, reconstruction and display programs have been developed in Interactive Data Language (IDL) to support NS-CTISP development. INTRODUCTIONImaging spectropolarimeters have been developed and are employed in several fields, including geology, where they are used in remote sensing to locate and identify Al, Cu, Fe, Pb and quartz based on their polarized reflection spectrum 1,2 . Conservationists have used imaging spectropolarimeters to map polarized solar reflection from water to aid in the delineation of wetlands 3,4 . However, the overwhelming majority of imaging spectropolarimeters are dedicated to astronomy, where they are found in traditional settings such as telescope based instruments 5,6,7 , and in more exotic locations such as airborne 1,8 , rocket-borne 9 , and satellite 8 platforms. Mapping polarization helps astronomers decipher which physical processes created the observed light. For instance, imaging spectropolarimeters are used to locate linearly and circularly polarized atomic transitions split by the Zeeman effect induced by the large magnetic fields present in nebulae and the corona of stars 10 . Astronomers also use imaging spectropolarimeters to study clouds 11 on our planet as well as others. In fact, the polarization phenomena recorded by imaging spectropolarimeters are of such interest to astronomers that at le...

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Intensity modulation-based spectral polarization measurement method of coded aperture

Qiao

Ning

Zhang

et al. 2019

Optics Communications

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<title>Computed-tomography imaging spectropolarimeter (CTISP): instrument concept, calibration, and results</title>

Cited by 4 publications

References 0 publications

Design and verification of fast-rotating polarization imaging system in dynamic scenes

Design and verification of fast-rotating polarization imaging system in dynamic scenes

Nonscanning computed tomography imaging spectropolarimeter (NS-CTISP): design and calibration

Intensity modulation-based spectral polarization measurement method of coded aperture

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