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Robust estimation of Stokes parameters with a partial liquid-crystal polarimeter under thermal drift

机译：热漂移下部分液晶偏振计对斯托克斯参数的鲁棒估计

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摘要

Polarized light carries information about the various physical parameters that have been acting upon it. Obtaining information on the observed object by studying the polarization of light reflected can be accomplished by several methods. The four Stokes parameters of the reflected light wave (S_0, S_1, S_2, and S_3) are generally estimated by observing the scene, with a CCD sensor, through a polarimeter. This device relies on acquisition of multiple frames relative to an adjustment parameter of the optical components: positioning angle or optical delay. In real-time applications, the polarimeter often uses liquid-crystal components. The adjustment retardation parameter is then controlled by an electric voltage. However, the retardation introduced by a liquid-crystal variable retarder (LCVR) is strongly dependent on temperature. One solution is to hold constant the LCVR temperature by using a thermostated environment, but this is not always possible (power consumption in remote sensing, for instance). In J. Opt. A 2, 216 (2000), Bueno has showed that, in this latter case, it is necessary to calibrate the LCVR just before carrying out measurement and to do this again approximately every 10 min. In this article, we propose a robust and accurate solution, based on the self-calibration principle, for measuring the Stokes parameters of partially linearly polarized light. Unlike methods generally reported in the literature, our polarization parameter estimation is independent of the accurate knowledge of the polarimeter variable retardation values and, thus, does not require a calibration process at regular intervals.
机译：偏振光携带有关已作用于其上的各种物理参数的信息。通过研究反射的光的偏振来获得关于被观察物体的信息可以通过几种方法来完成。通常，反射光波的四个斯托克斯参数（S_0，S_1，S_2和S_3）是通过CCD传感器通过偏振计观察场景来估算的。该设备依赖于相对于光学组件的调整参数的多个帧的获取：定位角度或光学延迟。在实时应用中，旋光仪通常使用液晶组件。然后，通过电压来控制调整延迟参数。但是，液晶可变延迟器（LCVR）引入的延迟在很大程度上取决于温度。一种解决方案是通过使用恒温环境来保持LCVR温度恒定，但这并不总是可能的（例如，遥感中的功耗）。在J. Bueno在2,216（2000）中显示，在后一种情况下，有必要在进行测量之前校准LCVR，并大约每10分钟重新校准一次。在本文中，我们提出了一种基于自校准原理的鲁棒且准确的解决方案，用于测量部分线性偏振光的斯托克斯参数。与文献中通常报道的方法不同，我们的偏振参数估计独立于偏振计可变延迟值的准确知识，因此不需要定期进行校准过程。

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