Hyperspectral Polarization Imaging Technology Based On Reflective Phase Retarder Array

Hyperspectral polarization imaging technology is an organic combination of polarization imaging technology and spectral imaging technology.It can simultaneously obtain the four-dimensional optical information data group of the target,which combined with two-dimensional position information,spectral information and polarization information.By analyzing the data group,the information about the physical and chemical properties of the target’s chemical materials and surface roughness can be obtained.The acquisition of four-dimensional data sets of optical information provides a rich source of information for target identification and detection,and has broad application prospects in various civil and military fields including earth resource census,biomedicine,military detection and anti-camouflage.Aiming at the problems of nonlinear optical path difference,low detection efficiency and field aliasing in the existing interference and spatial modulation hyperspectral polarization imaging schemes,this paper proposes a hyperspectral polarization imaging technology based on reflective phase retarder array and compact birefringent interferometer.Combined with spectral polarization recovery method and system calibration methods,the high-precision measurement of the target spectral polarization can be realized.This paper firstly introduces the basic principle of hyperspectral polarization imaging technology,and proposes a hyperspectral polarization imaging technology scheme based on reflective phase retarder array and birefringent crystal.Secondly,the polarization measurement matrix of the reflective phase retarder array composed of the wave plate and the broadband high-reflection mirror is deduced,and the optimization idea of the polarization modulation module is expounded.Using the differential evolution algorithm,with the constraint of the minimum condition number,the optimal structural parameters of the polarization modulation module are evaluated,and the optimization results are evaluated.At the same time,through ray tracing,the formula of the optical path difference of the shear plate and the compensation plate is deduced,the structural parameters of the interferometric modulation component are designed,and the nonlinear optical path difference and the total optical path difference distribution of the system are analyzed.Then,the key technologies in the recovery method of spectral polarization information are studied,including the image registration problem in the system push-broom mode,the problem of the detrended term of the interference signal,and the matrix exact solution method based on the singular value decomposition algorithm,and the spectral polarization imaging system is expounded.It provides method support and accuracy guarantee for the restoration and measurement of spectral polarization information.Finally,a hyperspectral polarization imaging experimental device based on a reflective phase retarder array and a compact birefringent interferometer was built.The interference image sequence of the polarizer array and the color car was collected at the working wavelength of 400-750 nm,and spectral restoration and polarization were performed.To restore,verify the system’s ability to measure the spectral polarization information of the measured target,collect the interference image sequence of metal and damaged wood,verify the system’s ability to identify different surface roughness and damaged targets,and analyze the source of experimental errors.The research results show that the imaging experimental device can realize the high-precision synchronous measurement of the target spectrum and polarization information,and provide the research of hyperspectral polarization imaging technology.a valuable reference.