No abstract

In order to effectively improve the contrast of target identification, an acousto-optic tunable filter (AOTF) full-Stokes imaging spectropolarimeter is proposed, which can measure synchronously polarization information with each spectral band in real time. The full-Stokes vectors are obtained by the division-of-aperture polarization imaging system. The spectral bands are selected by RF of the AOTF electrically. Based on this system, a polarization error model is established, and the influence of the key polarization element angle error is analyzed. The results show that the measurement error increases with the increase of the polarization degree. When P = 1 , the influence of the azimuth angle error is greater than the retardance error under the same angle error. The results are helpful to find the variation law of the polarization error and provide a theoretical reference for the design of new types of full-Stokes imaging spectropolarimeters.

With the development of modern space optical system, off-axis reflective system with wide spectrum, high resolution and large field of view has become the main direction of optical design. However, the off-axis property of off-axis reflective structure brings asymmetric aberration, which makes designers use free-form surface frequently to correct the aberration of optical system and improve the imaging quality. When the Trace Pro optical mechanical simulation software cannot accurately convert the optical system with free-form surface in CODE V, it is difficult to simulation stray light and analysis environmental in the subsequent studies. The reconstruction of free-form surface of off-axis three mirror optical systems are realized by Rhino in this paper. For the free-form surface in the off-axis three mirror optical systems designed by CODE V, a uniform circular dot ring array sampling method based on polar coordinates is proposed to obtain the free-form surface point cloud data. The point deviation of 5mm-80mm was analyzed, and the optimal sampling interval for the point cloud data of XY polynomial free-form surface with an aperture of 150mm was determined to be 10mm; The NURBS method is used to reconstruct the free-form surface model in Rhino, and the free-form surface reconstruction of the off-axis three mirror optical system is modeled in Trace Pro. Through the simulation of imaging optical path and the analysis of image point dispersion spot radius, it is verified that the free-form surface model of off-axis three mirror optical system can be reconstructed based on rhino. This research provides an effective method reference for optical mechanical joint simulation analysis.

No abstract

No abstract