Design and modeling of multi-spectral polarimetry streak tube imaging LiDAR

Abstract

A new Multi-Spectral Polarimetry Streak Tube Imaging LiDAR (MSP-STIL) system is proposed, with mathematical model of the system established and verified. Multiple experiments are conducted before drawing conclusions. Intensity images and degree of polarization (DOP) images at three wavelengths and a depth image of the target area can be obtained by the single imaging mode of the system, and Mueller matrices at three wavelengths of the target area can be obtained by the twice imaging mode of the system. Meanwhile, the proposed system utilizes the fiber optic delay device to alleviate the contradiction of traditional streak tube imaging LiDAR system among the large number of echo signals, the depth resolution and the depth of field. Therefore, the proposed system can perform multi-spectral polarimetry imaging and three-dimensional imaging with higher depth resolution and larger depth of field. Compared with the traditional single-wavelength streak tube imaging LiDAR system, the image contrast of the target area can be improved by fusing the spectral information, polarization information and three-dimensional information obtained by the proposed system, and the high-contrast image makes it easier to distinguish the target.