linear variable filter
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2021 ◽  
Vol 1 (04) ◽  
Author(s):  
Aliaksei Kobylinskiy ◽  
Matthias Kraus ◽  
Xavier Uwurukundo ◽  
Hartmut Hillmer ◽  
Robert Brunner

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4313
Author(s):  
Yunqiang Xie ◽  
Chunyu Liu ◽  
Shuai Liu ◽  
Xinghao Fan

Nighttime light remote sensing has unique advantages on reflecting human activities, and thus has been used in many fields including estimating population and GDP, analyzing light pollution and monitoring disasters and conflict. However, the existing nighttime light remote sensors have many limitations because they are subject to one or more shortcomings such as coarse spatial resolution, restricted swath width and lack of multi-spectral data. Therefore, we propose an optical system of imaging spectrometer based on linear variable filter. The imaging principle, optical specifications, optical design, imaging performance analysis and tolerance analysis are illustrated. The optical system with a focal length of 100 mm, F-number 4 and 43° field of view in the spectrum range of 400–1000 nm is presented, and excellent image quality is achieved. The system can obtain the multi-spectral images of eight bands with a spatial resolution of 21.5 m and a swath width of 320 km at the altitude of 500 km. Compared with the existing nighttime light remote sensors, our system possesses the advantages of high spatial and high spectral resolution, wide spectrum band and wide swath width simultaneously, greatly making up for the shortage of the present systems. The result of tolerance analysis shows our system satisfy the requirements of fabrication and alignment.


2020 ◽  
Vol 20 (8) ◽  
pp. 4171-4178
Author(s):  
Simon Chun Kiat Goh ◽  
Li Lynn Shiau ◽  
Mohamad Shamsul Bin Mohamad ◽  
Chengkuo Lee ◽  
Chuan Seng Tan

Author(s):  
Cheng-Hao Ko ◽  
Jih-Run Tsai ◽  
Bang-Ji Wang ◽  
Shin-Fa Lin ◽  
Chitsung Hong ◽  
...  

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