Linearity testing device for the photoelectric detecting system of solar spectrometers
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摘要: 依据光叠加原理研制了一台太阳光谱仪光电探测系统线性度测试装置。该测试装置由300 W高稳定度氙灯光源、250 W卤钨灯光源、双层中性滤光片轮、双孔光阑及光学成像系统组成。依靠中性滤光片改变光束强度，依靠独立开闭的双光阑和光学成像系统实现光流叠加。该装置工作波段为200~2 400 nm，可模拟紫外-可见-红外波段地外太阳光谱辐照度，动态范围为104，已用于太阳光谱仪等光谱仪和硅光电二极管标准探测器等光电探测系统线性测量。Abstract: According to the optical beam superposition principle, a set of linearity measurement devices of spectrometer photoelectrical detecting system was developed. It consists of a 300 W super-quiet xenon lamp, a 250 W halogen tungsten lamp, a neutral filter group, double apertures and optical imaging system. The radiant power of the optical beams is manipulated with neutral filters and optical beam superposition is achieved using double apertures and optical imaging system. The spectral range of this device is 200-2 400 nm and the dynamic range of the linearity measurement is 104. It can simulate the extraterrestrial solar spectral irradiance and can be used for measuring linearity in solar spectrometer photoelectrical systems and silicon photodiode standard detection.
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Key words:
- linearity /
- detecting system /
- spectrometer /
- radiometry
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图 3 硅二极管放大器探测器系统相对响应度与信号的函数关系
Figure 3. Relative responsivity as a function of signal for a silicon diode-amplifier detector system
图 5 光谱仪光电探测系统线性测试装置
Figure 5. Linearity measurement devices of spectrometer photoelectric detecting system
图 6 探测器光谱辐射通量响应度定标装置
Figure 6. Calibrating instrument of spectral radiant power responsivity for detector
图 7 S2281-31097硅光电二极管光谱响应度及其稳定性
Figure 7. Spectral radiant power responsivity and stability of S2281-31097 Si photodiode
图 8 S2281-31100硅光电二极管区域响应度均匀性
Figure 8. Spatial uniformity of S2281-31100 Si photodiode response
图 10 可见波段太阳光谱仪光谱辐照度响应度及其稳定性
Figure 10. Spectral irradiance responsivity and its stability of VIS solar spectrometer
图 11 可见波段太阳光谱仪地外太阳辐照下光谱输出
Figure 11. Output at extraterrestrial solar irradiance of VIS solar spectrometer
图 12 可见波段太阳光谱仪区域光谱辐照度响应度均匀性
Figure 12. Spatial uniformity of VIS solar spectrometer response
表 1 滤光片光密度和透过率
Table 1. Optical density and the transmittance of the neutral filters
Filter wheel Filter labels No.1 No.2 Optical density Transmittance/% Optical density Transmittance/% 1 0 100 0 100 2 1 10 0.1 79.43 3 2 1 0.3 50.12 4 3 0.1 0.5 31.62 5 4 0.01 / / 
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表 2 线性测量综合不确定度
Table 2. Uncertainty of linearity testing
Uncertainty sources Uncertainty/% VA reading stability and reproducibility 0.1 VB reading stability and reproducibility 0.1 V(A+B) reading stability and reproducibility 0.1 Combined uncertainty 0.14
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