Development Of Real - Time Polarization Imaging System Based On Liquid Crystal Modulation And Parallel Computing

Different from the traditional imaging method based on light intensity, polarization parameter indirect imaging technology plays an important application in material scientific, remote sensing, biomedical, military reconnaissance and other kind of science fields, which is an effective and powerful method for substance identification.In this dissertation, a research has been made on improving the measurement speed and efficiency of polarization parameter indirect imaging system, aiming to achieve the real-time measurements. According to the polarization of Jones matrix and Stokes matrix representation, based on liquid crystal variable retarder (LCVR) as the modulator in polarization parameter imaging system, computing and deducing has been made in theoretical. By adjusting the optical path configuration, computational complexity has been reduced. Using the LCVR as the core modulator, a high-speed polarization parameter imaging system has been built. With the advantage of direct digital frequency synthesis, the liquid crystal variable retarder controller has been designed and built, and which was integrated with temperature compensation function to improve the accuracy and enlarger the range of application of this system. Besides of that, camera external trigger control function was also integrated on the LCVR controller. By this means, the measurement hardware system can be organized as a whole on the LCVR controller. In addition, by using of compute unified device architecture (CUDA) parallel computing platform, the parallel computing program has been developed, which can achieve the gold of real-time calculation of the polarization parameter image. After the LCVR has been calibrated, the experiment has been made to verify the feasibility of the high-speed polarization imaging system. By analyzing the sources of measurement error, the improved scheme is put forward, and the improvement of the system was verified by comparison. This paper provides a reliable technical scheme for the further application of the high-speed polarization imaging system.