Bueno Juan M, Berrio Esther, Ozolinsh Maris, Artal Pablo
Laboratorio de Optica, Departamento de Física, Universidad de Murcia, Campus de Espinardo (Edificio C), 30071 Murcia, Spain.
J Opt Soc Am A Opt Image Sci Vis. 2004 Jul;21(7):1316-21. doi: 10.1364/josaa.21.001316.
A new method of determining objectively the amount of scattered light in an optical system has been developed. It is based on measuring the degree of polarization of the light in images formed after a double pass through the system. A dual apparatus composed of a modified double-pass imaging polarimeter and a wave-front sensor was used to measure polarization properties and aberrations of the system under test. We studied the accuracy of the procedure in a system that included a lanthanum-modified lead zirconate titanate (PLZT) ceramic plate able to generate variable amounts of scattered light as a function of the applied voltage. Changes in the voltage applied to the ceramics plate modified significantly the scattering contribution while hardly altering the wave-front aberration. The degree of polarization was well correlated with the level of scattering in the system as determined by direct-intensity measurements at the tails of the double-pass images. This indicates that this polarimetric parameter provides accurate relative estimates of the amount of scattering generated in a system. The technique can be used in a number of applications, for example, to determine objectively the amount of scattered light in the human eye.
一种客观测定光学系统中散射光量的新方法已被开发出来。它基于测量光在两次通过该系统后形成的图像中的偏振度。使用由改进的双程成像偏振计和波前传感器组成的双仪器来测量被测系统的偏振特性和像差。我们在一个系统中研究了该程序的准确性，该系统包括一块镧改性锆钛酸铅（PLZT）陶瓷板，它能够根据所施加的电压产生不同量的散射光。施加到陶瓷板上的电压变化显著改变了散射贡献，而几乎不改变波前像差。通过双程图像尾部的直接强度测量确定，偏振度与系统中的散射水平密切相关。这表明该偏振参数能提供系统中产生的散射量的准确相对估计。该技术可用于许多应用，例如，客观地测定人眼中的散射光量。
