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

Xie, Yongming; Liu, Chunyu; Liu, Shuai; Fan, Xinghao

doi:10.3390/s21134313

Cited by 12 publications

(5 citation statements)

References 45 publications

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“…The biggest impact of the dual-gratings on the image quality of the optical system should be the impact on the diffraction limit. The diffraction limit of an optical system is shown in Equation (11).…”

Section: The Effect Of Double-gratings On Mtfmentioning

confidence: 99%

“…Typical imaging spectrometers include HSI from America, ESA-HRIS and PRISM from ESA, COIS from US Navy's NEMO Program, FTHSI from MightySat II CHRIS on the European PROBA small satellite, and HYPERION on EO-1 satellite of America [10]. Nighttime light remote sensors that can capture imageries with high spectral and spatial resolution in a wide waveband and swath width were also investigated in [11]. In recent years, the need for high-performance imaging spectrometers that span an application space from satellite imagery to food safety has never been higher.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Gratings Imaging Spectrometer

et al. 2021

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Common dispersive-type spectroscopic instruments include prism-type and grating-type, usually using a single dispersive element. The continuous imaging band is always limited by the dispersion angle. When it is necessary to image two wavebands with an ultra-spectral resolution that are far apart, the imaging is difficult due to the large diffraction angle. To broaden the spectral coverage of the imaging spectrometer, in this paper, we propose a dual-gratings imaging spectrometer with two independently rotating gratings. In this proposed system, two very far apart wavelength bands can be imaged in the adjacent areas by adjusting the angle of the dual gratings. This greatly expands the spectral coverage of the imaging spectrometer. Currently, the only application area considered for this instrument is solar applications. In this article, we present the optical system of the dual-gratings imaging spectrometer, illustrate several advantages of the new structure, and discuss new problems caused by the dual-gratings, which are referred to as overlap between two spectra and double image offset. We deduced the calculation process of the dual grating rotation angle, the relationship between the final acquired image and the slit, the relationship between the angle change between the dual gratings and the double image offset, and the relationship between the MTF upper limit reduction and the spatial frequency. This article also summarizes the shortcomings of this structure and studies the applicable fields under these shortcomings. At last, we simulate a dual-gratings imaging spectrometer system, compare this scheme with two traditional schemes, and conclude that this instrument has certain practical significance.

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Section: The Effect Of Double-gratings On Mtfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual-Gratings Imaging Spectrometer

et al. 2021

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“…An LVF is a mature thin-film dispersive element and has many applications in space [4,5]. The spectral properties of LVFs have been studied in previous studies.…”

Section: Introductionmentioning

confidence: 99%

Errors modeling of fiber Bragg grating sensor interrogator with linear variable filter

Liu

Huang

2023

14th International Photonics and Optoelectronics Meetings (POEM 2022)

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In the aviation field, the instrument must be small, light, and vibration resistant. A Fiber Bragg Grating (FBG) sensor interrogator with a linear variable filter (LVF) can be well suited for the requirements in the aviation field, due to its special optical structure. Moreover, it has a great prospect of applications in the aviation field. An error model is established and the simulation results show that the inhomogeneous illumination of the incident light has an impact on the sensitivity of the interrogator. This paper defines the degree of inhomogeneity to describe the effect of inhomogeneous illumination. Using this model, the design of the interrogator can be optimized to improve its sensitivity.

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“…In accordance with the requirements of the on-orbit polarization calibration method, the polarization response properties of each instrument channel, i.e., the normalized Mueller matrix elements, need to be calibrated in the laboratory. The polarization spectrum reactivity of space remote sensing instruments is a key parameter for calibrating instruments in laboratories, and the results have practical significance for assessing the instrument’s performance [ 20 , 21 , 22 , 23 ]. This paper introduces the laboratory calibration of the UV hyperspectral instrument’s polarization properties and implements error correction for the system’s radiation transmission link, providing high-precision ground polarization calibration information for on-orbit polarization calibration.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Correction of Polarization Response Calibration Error of Limb Atmosphere Ultraviolet Hyperspectral Detector

Huang

et al. 2022

Sensors

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A UV hyperspectral instrument was designed with a polarization measurement channel for real-time in-orbit polarization correction to reduce the influence of polarization on the detection accuracy of atmospheric radiation. One of the prerequisites for in-orbit polarization calibration is accurately calibrating the instrument’s polarization properties in the laboratory. This study first introduces the calibration method and measuring device of the polarization characteristics of the ultraviolet (UV) hyperspectral detector and conducts a polarization calibration test of the instrument. The two main error sources introduced by the calibration device were emphatically analyzed, and the correction method of the error sources was deduced theoretically. Finally, the polarization calibration results of the UV hyperspectral detector were corrected, and the uncertainty analysis of the corrected calibration results was about 1.4%, which provides effective ground polarization calibration data for the on-orbit polarization correction of the instrument.

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

Cited by 12 publications

References 45 publications

Dual-Gratings Imaging Spectrometer

Dual-Gratings Imaging Spectrometer

Errors modeling of fiber Bragg grating sensor interrogator with linear variable filter

Analysis and Correction of Polarization Response Calibration Error of Limb Atmosphere Ultraviolet Hyperspectral Detector

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