製品 | 2021/5/14

2. Structure of Polarization Imaging Sensor and Principles

Basic structure of Polarization Imaging Sensor

Microscopic size polarization filters are integrated and placed in front of a CCD image sensor

Computation of polarization information from intensity at 4 neighbor pixels

[Relation between input polarization and intensity pattern]

[Computation principle ]
        Polarizer angle

Intensity is supposed to describe a sinusoid.
By knowing only 4 points of the curve, it is possible to recover the whole set of information for any input polarization.

Intensity pattern linked to the
state of polarization at each
location

Birefringence data (phase shift and
axis orientation) is present at each
point as quantitative data.

Measurement example: lens

レンズ測定画像の位相差分布
Phase shift distribution
レンズ測定画像の位相差主軸方向分布
Axis orientation
     Phase along lens circumference

・Detailed quantitative evaluation and comparison is possible between multiple sets of data.
・The slightest differences between two sets of data are easy to spot on displayed images.

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