A snapshot multi-wavelength interference microscope is proposed for high-speed measurement of large vertical range discontinuous microstructures and surface roughness. A polarization CMOS camera with a linear micro-polarizer array and Bayer filter accomplishes snapshot multi-wavelength phase-shifting measurement. Four interferograms with đťś‹/2 phase shift are captured at each wavelength for phase measurement, the 2đťś‹ ambiguities are removed by using two or three wavelengths.
We introduce a snapshot multi-wavelength quantitative polarization and phase microscope (MQPPM) for measuring spectral dependent quantitative polarization and phase information. The system uniquely integrates a polarized light microscope and a snap-shot quantitative phase microscope in a single system, utilizing a novel full-Stokes camera operating in the red, green, and blue (RGB) spectrum. The linear retardance and fast axis orientation of a birefringent sample can be measured simultaneously in the visible spectra. Both theoretical analysis and experiments have been performed to demonstrate the capability of the proposed microscope. Data from liquid crystal and different biological samples are presented. We believe that MQPPM will be a useful tool in measuring quantitative polarization and phase information of live cells.
We calibrate and test a division-of-focal-plane red–green–blue (RGB)
full-Stokes imaging polarimeter in a variety of indoor and outdoor
environments. The polarimeter, acting as a polarization camera,
utilizes a low dispersion microretarder array on top of a sensor with
Bayer filters and wire-grid linear polarizers. We also present the
design and fabrication of the microretarder array and the assembly of
the camera and validate the performance of the camera by taking
multiple RGB full-Stokes images and videos. Our camera has a small
form factor due to its single-sensor design and the unique capability
to measure the intensity, color, and polarization of an optical field
in a single shot.
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