Design and Test of a Spectrally Tunable Integrating Sphere Reference Light Source with Large Exit Aperture

Yinlin, 袁银麟 Yuan; Jun, 徐骏 Xu; Wenchao, 翟文超 Zhai; Tao, 戚涛 Qi; Peng, 邹鹏 Zou; Haoyu, 吴浩宇 Wu; Xiaobing, 郑小兵 Zheng

doi:10.3788/aos201333.0712004

Cited by 3 publications

(2 citation statements)

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“…As shown in Fig. 6, The NURP measurement system comprises an integrating sphere with large aperture (Yuan et al, 2013;Yuan, 2014) and a spectral radiometer. We choose the sectional viewing field measurement method to detect the NURP because (a) the FOV inconsistency among 3 polarized channels caused by the wedge-shaped lenses could be avoided.…”

Section: Nurp Measurementmentioning

confidence: 99%

Polarimetric Calibration of the Spaceborne Directional Polarimetric Camera Installed on the Gf-5 Satellite

Yuan

Liu

Zheng

et al. 2020

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. The Spaceborne Directional Polarimetric Camera (SDPC) is dedicated to obtain an accurate information of clouds and microphysical properties of aerosol particles via multi-angle, multi-spectral and multi-polarization observations. It images the Earth with 110° field of view (FOV) in 3 polarimetric spectral bands and 5 non-polarimetric spectral bands from visible to near infrared. Due to its wide FOV telecentric optical system and multi-channels, polarization sensitivity of optical components (PSOC) and non-uniform response of pixels (NURP) are the main uncertainty factors of polarimetric calibration.In this paper, a polarimetric calibration model of SDPC has been constructed for increasing the measurement accuracy. Combined an integrating sphere with a polarization generator as source, PSOC can be measured in high accuracy by using the Fourier series analysis method which reduces the impact form the alignment error of the generator. The sectional viewing field measurement method is used to acquire NURP while the large aperture integrating sphere served as reference source. Subsequently, the data of NURP have been corrected by the relative transmittance of high frequency and low frequency respectively for polarized channels. The result of validation experiment shows that the polarization measurement errors in 0°, 15°, 30°, and 45° half field of view (HFOV) are all less than 0.5% when the degree of linear polarization of reference source is larger than 0.1.

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Section: Nurp Measurementmentioning

confidence: 99%

Polarimetric Calibration of the Spaceborne Directional Polarimetric Camera Installed on the Gf-5 Satellite

Yuan

Liu

Zheng

et al. 2020

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…统和空间滤波器组成的光谱分布可调谐的光源系统，该系统结构复杂、产生的光谱形状有限且辐射能量低，难以用于工程实践 [7] 。随着发光二级管(LED)技术的发展，特别是大功率蓝光和白光 LED 的出现， LED 光源得到广泛应用，研究者开始提出研制基于 LED 的光谱可调光源，例如美国标准与技术研究所(NIST)设计的基于 LED 的光谱可调积分球光源 (STIS) [8] 。在国内安徽光学精密机械研究所、长春光学精密机械研究所以及台湾国立中央大学等研究机构也做了类似的研究 [9][10] 2式可以定量地计算地物的颜色三刺激值 [12] 。传统的白平衡目标光谱不匹配造成的定标误差；在大口径光谱可调积分球光源控制系统设置地物光谱数据库，收集各种地物光谱，通过模拟各种种类的地物光谱对多光谱相机进行色度定标，定标系数对于后续处理多光谱图像具有重要作用，可以有效地解决多光谱成像设备颜色失真现象；此外光谱可调积分球光源可用于探测器以及遥感设备的光谱辐射定标。参考文献…”

Section: 引言unclassified

Research on Color Correction of Multi-Spectral Camera Based on Spectral Tunable Integrating Sphere

Jinrong¹,

Jian-wei²,

Hongxing³

et al. 2015

激光与光电子学进展

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Multi spectral remote sensor image synthesis is directly extracted from R, G, B bands of the multispectral images. Because of the mismatch between the spectral response characteristics of multi spectral imaging detector and international commission on illumination (CIE) color matching functions, color images appear serious color distortion. In order to correct the color distortion, color correction is needed. Aiming at the shortcoming of traditional white balance method and color synthesis method, improved multi point color synthesis method based on spectral tunable light emitting diode (LED) integrating sphere is proposed. This method not only contains the spectral features of the objects but also is easy to realize. It is proved that the color chromaticity error of the target can reach 0.15 corrected by white balance. However the color chromaticity error of the target can be limited less than 0.05 when the method is used to correct the color distortion.

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Large dynamic range stellar radiation simulation optical system

Zhang,

Fu,

Liu

et al. 2024

Sci Rep

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For the current stellar spectral simulation can not realize the stellar color temperature information with large dynamic range simulation, this paper proposes a broad spectrum high-resolution subdivision and spatial beam zoning modulation combined with a large dynamic range of stellar radiation information simulation method, designed a kind of imaging and non-imaging stellar radiation information simulation optical system, using an optical system to achieve multi-color temperature spectrum and large dynamic range stellar simulation. The experimental results show that the designed system can simultaneously achieve the spectral simulation accuracy (single point evaluation) better than ± 7% in the range of spectral 450–1000 nm and color temperature 3000–11,000 K; on the premise of ensuring the spectral simulation accuracy, the magnitude simulation range reaches 0 to + 12 Mv, and the magnitude simulation accuracy is better than ± 0.05 Mv; Accurate simulation of stellar spectral information and energy large dynamic range tuning is realized, and the system is extended. The system function has been extended to realize the switching of broadband and narrowband modes, The half-peak width of the narrowband output beam is better than 4.1 nm, which extends the application of the spectral simulation technology and provides the theoretical and technical basis for the ground calibration of the development of the high-precision stellar radiation information ground simulation system.

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Design and Test of a Spectrally Tunable Integrating Sphere Reference Light Source with Large Exit Aperture

Cited by 3 publications

References 0 publications

Polarimetric Calibration of the Spaceborne Directional Polarimetric Camera Installed on the Gf-5 Satellite

Polarimetric Calibration of the Spaceborne Directional Polarimetric Camera Installed on the Gf-5 Satellite

Research on Color Correction of Multi-Spectral Camera Based on Spectral Tunable Integrating Sphere

Large dynamic range stellar radiation simulation optical system

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