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Optical Design of Imaging Spectrometer Based on Linear Variable Filter for Nighttime Light Remote Sensing.

Yunqiang Xie1,2,3, Chunyu Liu1,3, Shuai Liu1,3

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

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Summary

This study introduces a novel imaging spectrometer for nighttime light remote sensing, overcoming limitations of current systems. The new sensor offers high spatial and spectral resolution, enabling more detailed analysis of human activities from space.

Keywords:
high resolutionimaging spectrometernighttime light remote sensingoptical system

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Area of Science:

  • Remote Sensing
  • Optical Engineering
  • Spectroscopy

Background:

  • Nighttime light remote sensing is crucial for monitoring human activities, population estimation, and disaster assessment.
  • Existing sensors suffer from limitations like coarse spatial resolution, narrow swath width, and lack of multi-spectral data.

Purpose of the Study:

  • To propose and design an advanced optical system for nighttime light remote sensing.
  • To overcome the limitations of current remote sensing technologies for capturing nighttime light data.

Main Methods:

  • Development of an imaging spectrometer utilizing a linear variable filter.
  • Detailed optical design, including specifications for focal length, F-number, and field of view.
  • Analysis of imaging performance and tolerance to ensure fabrication feasibility.

Main Results:

  • The designed system operates in the 400-1000 nm spectrum with a 100 mm focal length and F-number 4.
  • Achieves a spatial resolution of 21.5 m and a swath width of 320 km from an altitude of 500 km.
  • Acquires multi-spectral images in eight bands with excellent image quality.

Conclusions:

  • The proposed imaging spectrometer offers simultaneous high spatial and spectral resolution, wide spectrum coverage, and a wide swath width.
  • This system significantly enhances nighttime light remote sensing capabilities compared to existing technologies.
  • Tolerance analysis confirms the system's suitability for fabrication and alignment.