空间振幅调制光谱偏振测量技术研究

空间振幅调制光谱偏振测量技术通过由光楔、偏振片组成的调制模块,将目标的偏振信息调制到与光谱维垂直的空间维,单次测量即可同时获取目标的偏振信息和光谱信息。首先阐述空间振幅调制光谱偏振测量技术的基本原理,然后利用空间调制光谱偏振仿真软件进行理论仿真,并且给出了具体的实验研究方案,通过对比理论模拟图像和实验图像,验证实验的可靠性。以Q=0,U=1,V=0和Q=1,U=0,V=0作为入射偏振光进行实验,在波长范围500~600nm采样10组数据,利用最小二乘法对实验输出的偏振光进行偏振解调。结果表明:解调后入射光的线偏振度与参考入射光的误差值分别小于2.5%和4%,偏振角误差值小于1.8%和2%,验证了实验和算法的可行性,并对两组复合光楔中心误差对偏振测量的影响作了简要分析,结果表明中心误差对偏振分量Q和V的测量影响较大。

Research on Spatial Amplitude Modulation for Spectropolarimetry Measurement Technology

The spatial amplitude modulation for spectropolarimetry measurement technology modulates polarization information to spatial dimension vertical to spectral dimension by modulation module composed of wedges and polarizers.Polarization infor-mation and spectral information can be acquired at the same time with a single observation.Firstly,this paper explores the basic principle of spatial amplitude modulation for spectropolarimetry measurement technology.Then,theoretical simulation and experimental research is carried on.By comparing the simulation and experimental images and verify the reliability of the experi-ment.The theoretical simulation scheme and experimental scheme is proposed.The incident polarized light (Q=0,U =1,V =0 and Q=1,U =0,V =0)is used in the experiment respectively.10 sets of data are sampled in the range of 500～600 nm and exit polarized light is demodulated through the least square method.According to the experimental results,the error between linear polarization degree of the demodulation incident light and reference incident light is less than 2.5％ and 4％ and the error of polarization angle is less than 1.8％ and 2％,which verifies the feasibility of the experiment and algorithm,the brief analysis of the double combo wedges center error influence on the polarization measurement,the results show that center error is greatly in-fluenced on Q and V .