A compact wide-spectrum imaging spectrometer using freeform surface

Feng, Lei; Nie, Yunfeng; Xiangli, Bin; Wei, Lidong; He, Xiaoying; Li, Yacan; Zhou, Jinsong

doi:10.1016/j.optcom.2019.125097

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…GOMX-4 [ 7 ] and Aalto-1 [ 8 ] have a mass of only 1.1 kg and 600 g respectively, but their spatial resolution is no better than 70 m. In the future, studies on lenslet array and metasurface will probably be used in the area of weight reduction [ 9 , 10 ]. In terms of FOV, researchers from the University of Chinese Academy of Science used a compact prism spectrometer to increase the swath width of the hyperspectral camera to 5000 pixels [ 11 , 12 ]. Due to insufficient energy, it is more difficult for miniaturized hyperspectral cameras to improve spatial resolution than to increase the field of view and reduce the mass.…”

Section: Introductionmentioning

confidence: 99%

The Instrument Design of Lightweight and Large Field of View High-Resolution Hyperspectral Camera

Fan

Liu

et al. 2021

Sensors

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The design of compact hyperspectral cameras with high ground resolution and large field of view (FOV) is a challenging problem in the field of remote sensing. In this paper, the time-delayed integration (TDI) of the digital domain is applied to solve the issue of insufficient light energy brought by high spatial resolution, and a hyperspectral camera with linear variable filters suitable for digital domain TDI technology is further designed. The camera has a wavelength range of 450–950 nm, with an average spectral resolution of 10.2 nm. The paper also analyzed the effects of digital domain TDI on the signal–noise ratio (SNR) and the spectral resolution. During its working in orbits, we have obtained high-SNR images with a swath width of 150 km, and a ground sample distance (GSD) of 10 m @ 500 km. The design of the hyperspectral camera has an improved spatial resolution while reducing the cost.

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Section: Introductionmentioning

confidence: 99%

The Instrument Design of Lightweight and Large Field of View High-Resolution Hyperspectral Camera

Fan

Liu

et al. 2021

Sensors

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Method for designing a grid-slit spectrometer with low spectral-line bending

Zhang,

Li,

et al. 2024

Optics and Lasers in Engineering

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Design of a compact wide-band triple grating imaging spectrometer based on freeform surfaces

Chen,

Wang,

Huo

et al. 2024

Appl. Opt.

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Wide-band, high spectral resolution, and miniaturized imaging spectrometers have important applications. However, the working band, spectral resolution, and volume of the imaging spectrometers are mutually restricted. To solve this problem, we proposed a method in which multiple working bands share the same optical components except gratings, and the working bands switch with the switching of the working gratings. Based on the freeform surfaces characterized by XY polynomials, we designed a compact wide-band triple grating imaging spectrometer through the design ideas of human-computer interaction and iterative optimization. The imaging spectrometer works in the wavelength band of 200nm∼1600nm, covering ultraviolet (UV), visible, and near-infrared light, and it has a compact optical path volume of 24mm×38mm×80mm. Three gratings with 0.0025 mm, 0.005 mm, and 0.01 mm line spacing are used to realize dispersion with high diffraction efficiency in the bands of 200nm∼400nm, 400nm∼800nm, and 800nm∼1600nm, respectively. The UV detector receives imaging light in the UV band (200nm∼400nm), and the visible near-infrared (VNIR) detector receives imaging light in the visible and near-infrared bands (400nm∼1600nm). The design results show that the spectral resolutions of the three bands are 0.4 nm, 0.8 nm, and 1.6 nm, and the spectral smile and keystone distortion are less than 1.4 µm. The design results have engineering application value.

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A compact wide-spectrum imaging spectrometer using freeform surface

Cited by 4 publications

References 20 publications

The Instrument Design of Lightweight and Large Field of View High-Resolution Hyperspectral Camera

The Instrument Design of Lightweight and Large Field of View High-Resolution Hyperspectral Camera

Method for designing a grid-slit spectrometer with low spectral-line bending

Design of a compact wide-band triple grating imaging spectrometer based on freeform surfaces

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