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基于Savart板的新型时空混合调制型偏振干涉成像光谱仪(TSMPIIS)是一种静态、小型化、高稳定性的遥感偏振探测器件, 可以用来实现对目标的光谱信息以及偏振信息的探测. 目前, 已经确立了通过旋转TSMPIIS偏振片法来实现测量的方案, 然而该方案破坏了TSMPIIS系统原有的稳定结构, 降低了仪器的测量精度和可靠性. 为克服旋转偏振片法的不足, 本文从TSMPIIS的探测原理出发, 通过分析和计算TSMPIIS的Mueller矩阵, 推导出了全视场角度的TSMPIIS旋转偏振探测法的基本公式, 论证了TSMPIIS全视场偏振信息探测的可行性和准确性, 为TSMPIIS的遥感探测以及Stokes参数的反演提供了理论依据, 进一步拓展了TSMPIIS遥感探测的优越性. 相似文献
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提出了一种采用基于视场补偿型Savart偏光镜的新型偏振干涉成像光谱仪对二维目标偏振信息进行空间遥感探测的新原理和新方法.在新型偏振干涉成像光谱仪光学系统不变的情况下,通过旋转偏振干涉仪分别测出了三个不同角度下像面上各像点的光强值,反演出了二维面目标的斯托克斯矢量,并给出了各像点偏振度和偏振方向的理论表达式.采用计算机模拟实验对该探测原理和方法进行了验证,所得结果与理论完全符合.从理论和实践上扩展了干涉成像光谱仪的探测功能,与目前国内外所研究的成像光谱仪相比,该成像光谱仪既能同时探测目标二维空间信息和一维光谱信息,又提供了一种获得目标偏振信息的手段和方法. 相似文献
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A polarization interference imaging spectrometer for remote sensing is developed. Its operation principle and typical configuration are introduced. A polarization beam-splitter is its key component of the spectrometer. The advantages and disadvantages of the instrument are discussed compared with those of other instruments, which are based on the principle of active exploration for remote targets. The principles, strategies, methods, contents, aspects, and steps of calibration for the instrument are introduced. The experimental result of relative calibration for the CCD detector of a PIIS is given. Some applications and expectations of polarization interference imaging spectroscopy are put forward. 相似文献
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基于辐射度学、电磁与偏振理论和傅里叶变换光谱学理论,从理论和实验上对超小型稳态偏振干涉成像光谱仪的信噪比进行了深入地分析与讨论.推导出了其信噪比的理论计算公式;采用计算机模拟给出了傍轴条件下信噪比随入射角的变化规律;深入分析了偏振干涉成像光谱仪所特有的偏振化方向对信噪比的影响.在调制度等于0.6,0.7,0.8,0.9,1.0时,给出信噪比随偏振器光轴偏角的变化关系,并给出最优化值.在最优化情况下,采用计算机模拟得出了信噪比随探测器像元数的变化规律,与干涉成像光谱实验结果完全相符.理论与实验结果表明,该偏振干涉成像光谱仪在高调制度的情况下具有高通量、高信噪比的显著特点,适合于航空航天、远距离目标和微弱信号的探测.该研究为新型偏振干涉成像光谱技术的研究和新型成像光谱仪的设计、研制和工程化提供了重要的理论依据和实践指导. 相似文献
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根据相似性准则,对采集到的干涉图像进行干涉图元的拆分,通过寻址定位,得到与离散光程差序列相匹配的采样干涉图序列。采用过零采样方式,对大单边干涉图序列与小双边干涉图序列利用不同的窗函数进行切趾。为了校正相位误差,结合所研究采样干涉图的特点,对频域光谱乘积校正和空域干涉图卷积校正进行了研究和改进,获得了比较理想的光谱线形,其中空域干涉图卷积校正后的光谱偏差仅为0.012088,具有最好的校正效果。 相似文献
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A polarization interference imaging spectrometer (PIIS) for remote sensing is developed. Its operation principle and typical configuration are introduced. A polarization beam-splitter is its key component. The principle of calibration for the PIIS is introduced. The results of relative calibration for the PIIS are given. After the calibration, the responding uniformity of the detector of the PIIS to an expanded uniform light source is largely improved and the quality of the pictures obtained by the PIIS is obviously clear and accurate to the aims. Some applications and expectations of a PIIS are put forward. 相似文献
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干涉成像光谱技术是利用光的干涉原理获取目标光谱信息的一种成像技术。为研究其在强光下的干扰效果和机理,以大孔径静态成像光谱仪为典型对象,开展了相关仿真实验研究。以实际地物的图像和光谱信息为对象,仿真生成了原始干涉成像图案,并模拟830 nm单波长激光和超连续谱激光两种干扰源,分别研究不同辐照强度下的典型干扰效果,分析时假设光谱角大于30°时原始光谱信息丢失。基于本文的仿真模型,得到的相关结果表明,在830 nm的单波长激光干扰情况下,当干扰与目标成像峰值之比大于0.2∶1时原始光谱信息无法正确复原(光谱角大于30°),但模拟加入830 nm滤光片后,干扰效果被有效滤除。在超连续谱激光干扰情况下,不考虑饱和阈值时光谱角数值最终稳定在21°;考虑探测器饱和阈值为目标成像强度峰值3倍时,干扰与目标成像峰值之比大于2.1∶1时,原始光谱信息便无法分辨。该研究可能为同类型光谱仪的激光辐照效应和损伤机理的后续研究,以及光谱成像系统的激光防护和性能优化提供参考。 相似文献
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The optical path difference (OPD) of the static polarization interference imaging spectrometer and wide-field-of-view polarization interference imaging spectrometer are calculated and analyzed, simultaneously. The analysis results show that the actual total OPD contains two parts, the Savart polariscope introduces the first part, and the second part is introduced when imaging lens reunites two beams in its focal plane. Since the first part OPD accounts for about half of the actual total OPD, it has influences on the resulting spectrum and thus cannot be neglected. The influences of the uniaxial crystal dispersion on the OPD and resulting spectrum are analyzed, and the results show that the OPD decreased with the wavelength, the spectral resolution increased with the wavelength. There are no fixed spectral resolution over the entire detection spectral region, and the spectral resolution would become worse with the increase of the wavelength. 相似文献
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为满足红外成像光谱仪大光通量、高稳定性的应用需求,提出了一种基于多级阶梯微反射镜的静态化、无狭缝式、新型红外时空联合调制型傅里叶变换成像光谱仪结构.对其工作原理和光程差的产生方式进行了分析.作为该成像光谱仪的重要部件,前置成像系统决定了光程差的分布,其性能直接影响到目标物体的图像质量.根据系统光程差的产生方式,分析和设计了像方远心光路结构的前置成像系统.利用被动光学消热差方法对前置成像系统进行了消热差研究.结果表明:当温度在-20—60?C的范围内时,各个视场的调制传递函数均达到衍射极限,在多级阶梯微反射镜的总阶梯高度范围内成像质量良好;在不同的温度下,各视场处主光线在像面上的最大入射角小于0.02?. 相似文献
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论述了偏振型干涉成像光谱仪的核心部件——Savart偏光镜的结构和分光机理. 应用波法线追迹的方法, 对光在任意方位入射面内, 以任意入射角入射时Savart偏光镜中的光线传播规律及出射光孔径变化进行了理论推导, 给出了出射孔径与入射位置、入射角及入射方位角之间满足的关系, 并讨论了光线传播始终处于Savart偏光镜晶体内部, 最终从出射面射出所需满足的条件. 采用计算机模拟, 给出了光线垂直入射时, 出射孔径的表达式, 验证了推导的正确性; 在此基础上对自行设计的干涉成像光谱仪通光孔径进行了详细分析和讨论, 结果表明通光孔径精确值和近似值之间存在较大差异. 给出了孔径面积利用率随入射方位角的变化曲线, 阐明在干涉成像光谱仪的参数论证以及孔径光阑的选取中, 不能忽略由于晶体双折射现象带来的孔径变化. 研究结果可为偏振型干涉成像光谱仪的设计、研制、调试和工程化提供重要的理论依据和实践指导. 相似文献
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论述了基于单Wollaston棱镜的偏振干涉成像光谱仪的基本原理;采用波法线追迹方法,对光以4种不同入射方式经过偏振干涉成像光谱仪中单Wollaston棱镜的精确光程差、分束角及干涉条纹定位面进行了计算,并给出它们与棱镜楔角、入射角及入射位置之间的理论公式;采用计算机模拟对光程差、分束角及条纹定位面的精确值和近似值进行分析与比较,结果表明精确值和近似值之间存在较大差异;当棱镜楔角、入射角及入射位置增大时,精确值和近似值之间的偏离量随之增大;利用得到的精确值分析了条纹定位面的偏离量及其对傅里叶透镜成像的影响
关键词:
偏振干涉成像光谱仪
Wollaston棱镜
光程差
条纹定位面 相似文献
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The mechanism of beam splitting and principle of wide-field-of-view compensation of modified Savart polariscope in the wide-field-of-view polarization interference imaging spectrometer (WPIIS) are analyzed and discussed. Formulas for the lateral displacement and optical path difference (OPD) produced by the modified Savart polariscope are derived by ray-tracing method. The theoretical and practical guidance is thereby provided for the study, design, modulation, experiment and engineering of the polarization interference imaging spectrometers and other birefringent Fourier-transform spectrometers based on Savart polariscopes. 相似文献
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为了在较大视场范围内获得干涉直条纹以提高干涉数据的提取精度,设计了一种基于组合Savart板的宽场偏振干涉成像光谱仪.组合Savart板由正负晶体制作的两个Savart板组合而成.文中推出了组合Savart板的光程差和横向剪切量与入射角的理论表达式,并给出了具体设计实例.计算机模拟分析结果表明,在光谱分辨率和晶体总厚度相同的前提下,组合式Savart板获得干涉直条纹的视场是传统Savart偏光镜视场的10倍.
关键词:
偏振成像光谱仪
Savart板
光程差
视场 相似文献
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阐述了自行研制的新型偏振干涉成像光谱仪中重要偏光器件格兰-泰勒棱镜的分光机理,应用光线追迹法分析计算了光在格兰-泰勒棱镜中的传播规律与光线轨迹;推导出了任意角度入射时光线在棱镜中的传播方向及出射点坐标;给出了格兰-泰勒棱镜的像点位移和色差理论计算公式.该研究对晶体器件像质的分析计算及评价具有普遍的指导意义,为新型偏振干涉成像光谱技术的研究以及偏振干涉成像光谱仪的研制提供了重要的理论依据.
关键词:
偏振干涉成像光谱仪
格兰-泰勒棱镜
像点位移
色差 相似文献
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《中国光学快报(英文版)》2016,(12)
A background removal method based on two-dimensional notch filtering in the frequency domain for polarization interference imaging spectrometers(PIISs) is implemented. According to the relationship between the spatial domain and the frequency domain, the notch filter is designed with several parameters of PIISs, and the interferogram without a background is obtained. Both the simulated and the experimental results demonstrate that the background removal method is feasible and robust with a high processing speed. In addition, this method can reduce the noise level of the reconstructed spectrum, and it is insusceptible to a complicated background, compared with the polynomial fitting and empirical mode decomposition(EMD) methods. 相似文献
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Relationship between incident angle and dispersion in static large field of view polarization interference imaging spectrometer 下载免费PDF全文
The static large field of the view polarization interference
imaging spectrometer is based on the modified Savart polariscope.
There appears a dispersion between the ordinary ray and extraordinary
ray when light passes through the modified Savart polariscope. The
dispersion greatly influences the intensities and the results of the
interferogram and target image in the static large field of the view
polarization interference imaging spectrometer. At the same time,
the incident angle determines the dispersion. When the light goes
through the modified Savart polariscope, the dispersion occurs in
the left plate, the half-wave plate and the right plate of the
modified Savart polariscope. Using the extension of Snell's law, the
dispersion in the crystal is theoretically calculated and
numerically simulated separately. The relationship curve between
incident angle and the dispersion is obtained by simulation. 相似文献