Chen Zhenyue, Wang Xia, Liang Rongguang
Appl Opt. 2015 Feb 10;54(5):995-1001. doi: 10.1364/AO.54.000995.
Microgrid polarimeters have large advantages over conventional polarimeters because of the snapshot nature and because they have no moving parts. However, they also suffer from several error sources, such as fixed pattern noise (FPN), photon response nonuniformity (PRNU), pixel cross talk, and instantaneous field-of-view (IFOV) error. A characterization method is proposed to improve the measurement accuracy in visible waveband. We first calibrate the camera with uniform illumination so that the response of the sensor is uniform over the entire field of view without IFOV error. Then a spline interpolation method is implemented to minimize IFOV error. Experimental results show the proposed method can effectively minimize the FPN and PRNU.
微电网偏振计由于具有快照特性且无移动部件，相比传统偏振计具有很大优势。然而，它们也存在几个误差源，如固定模式噪声（FPN）、光子响应不均匀性（PRNU）、像素串扰和瞬时视场（IFOV）误差。提出了一种表征方法以提高可见波段的测量精度。我们首先用均匀照明对相机进行校准，以使传感器在整个视场内的响应均匀且无IFOV误差。然后采用样条插值方法来最小化IFOV误差。实验结果表明，所提出的方法能有效最小化FPN和PRNU。
