Bénière Arnaud, Alouini Mehdi, Goudail François, Dolfi Daniel
Laboratoire Charles Fabry de l'Institut d'Optique, Centre National de la Recherche Scientifique, Université Paris-Sud, Campus Polytechnique, RD 128, 91127 Palaiseau, France.
Appl Opt. 2009 Oct 20;48(30):5764-73. doi: 10.1364/AO.48.005764.
We present a degree of polarization imaging system based on a Wollaston prism and a single CCD camera. This architecture eliminates technical inaccuracies and noise sources that are present in experimental setups containing a polarization switching element. After the acquisition of two images corresponding to two orthogonal states of polarization, one can compute the orthogonal state contrast image (OSCI), which is an estimate of the local degree of polarization of the backscattered light when the observed materials are purely depolarizing. The instrument design coupled to an efficient calibration enables the estimation of the OSCI from a single image acquisition and significant reduction of technical noise present in other polarization imaging systems. The setup was tested in realistic conditions where it represents a real asset.
我们展示了一种基于沃拉斯顿棱镜和单个电荷耦合器件（CCD）相机的偏振度成像系统。这种架构消除了包含偏振切换元件的实验装置中存在的技术误差和噪声源。在获取对应于两个正交偏振态的两幅图像后，可以计算正交态对比度图像（OSCI），当观察的材料是纯去偏振时，它是后向散射光局部偏振度的估计值。与高效校准相结合的仪器设计能够从单次图像采集估计OSCI，并显著降低其他偏振成像系统中存在的技术噪声。该装置在实际条件下进行了测试，在这些条件下它展现出了实际价值。
