Optical design of imaging system based on spatial heterodyne spectrometer

Haiyan, 罗海燕 Luo; Shuang, 李双 Li; Hailiang, 施海亮 Shi; Wei, 熊伟 Xiong; Jin, 洪津 Hong

doi:10.3788/irla201645.0818005

Cited by 3 publications

(3 citation statements)

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“…The SHS, as depicted in Figure 1, consists of three main components [11]: the collimation system, the interferometer, and the imaging system. The collimation system transforms the light emitted by the light source into parallel light through a collimating lens assembly, which is then projected into the interferometer.…”

Section: Simulation Of Shs Interference Data 21 the Principle Of Shsmentioning

confidence: 99%

Research on correction method of saturation interference data of space heterodyne spectrometer

Zhang,

Li,

Luo

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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The spatial heterodyne spectroscopy (SHS) technique comprehensively integrates the principles of grating diffraction and spatial interference, enabling the detection of activities with high resolution and signal-to-noise ratio, which is adopted for high-precision remote sensing of atmospheric composition. SHS employs a focal plane array detector to simultaneously record the interference information of different optical path differences. When detecting continuous intense light signals, due to the limitations of interference modulation and the dynamic response range of the detector, the interference zero optical path point and its adjacent pixels become saturated. Directly recovering the spectrum from the saturation interferogram can lead to significant deviations from the theoretical spectrum. Base on the imaging principle of SHS, a simulation model was established for the interference data saturation of the zero optical path point and its vicinity, and used to analyse the influence of phase error on interference data. Utilizing the property of invariant phase error in SHS, a particle swarm algorithm (PSO) is employed to calibrate the intensity values of the saturation interference data. The results indicate that the proposed algorithm can reduce the normalized root-mean-square error of the recovered spectrum from 5.01e-2 to 2.10e-3.

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Section: Simulation Of Shs Interference Data 21 the Principle Of Shsmentioning

confidence: 99%

Research on correction method of saturation interference data of space heterodyne spectrometer

Zhang,

Li,

Luo

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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“…, substituting into Equation (1) to obtain Equation (2). Viewing the Littrow wavenumber 0  as the system fundamental frequency of the spatial heterodyne spectrometer, the further the deviation from the fundamental frequency, the higher spatial frequency of interference fringes.…”

Section: Overview Of the Gmi Payloadmentioning

confidence: 99%

“…It achieves global remote sensing detection of greenhouse gases, and can achieve highprecision solar calibration on orbit. It is currently the only remote sensing payload globally that utilizes the spatial heterodyne interferogram system for greenhouse gas detection [2].…”

Section: Introductionmentioning

confidence: 99%

Research on calculation method of on-orbit instrumental line shape function for the Greenhouse Gases Monitoring Instrument on the GaoFen-5B satellite

Han,

Shi,

et al. 2024

Preprint

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The Greenhouse Gases Monitoring Instrument is based on the spectroscopic principle of spatial heterodyne spectroscopy technology and has the characteristics of no moving parts, hyperspectral resolution, and large luminous flux. The instrumental line shape function is one of the important parameters characterizing the characteristics of the instrument and plays a vital role in the system error analysis of instrument measurement. To accurately obtain the instrumental line shape function of the spatial heterodyne spectrometer during on-orbit period and improve the accuracy of gas concentration retrieval, this paper develops a method to model and characterize the characteristics of the instrumental line shape function, including modulation loss and phase error. Utilizes the stability of solar observation spectrum wavelength and is not influenced by additional conditions to update the instrument line function. The Kurucz solar spectrum model used as the theoretical reference spectrum, selects the characteristic spectral lines corresponding to the measured solar calibration spectrum and the reference spectrum in the 1.568~1.583 μm band, and adjusts the instrumental line shape function model parameters, iterates the characteristic spectral lines residual, and calculates the instrumental line shape function variations. The updated instrumental line shape function has increased the average relative deviation between the theoretical simulated and measured solar spectrum from 1.83% to 0.756%, and the average relative deviation between the nadir observation spectrum and the simulated spectrum has increased from 7.049% to 2.106%. The findings demonstrate that updating the instrumental line shape function mitigates the impact of variations in the spectrometer's instrumental line shape due to alterations in the orbital environment. This offers a dependable reference for both the enhancement and oversight of the spectrometer's instrumental line shape function, along with the investigation of shifts in instrument parameters.

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Alignment error analysis of detector array for spatial heterodyne spectrometer

Jin

Chen

et al. 2017

Appl. Opt.

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Spatial heterodyne spectroscopy (SHS) is a new spatial interference spectroscopy which can achieve high spectral resolution. The alignment error of the detector array can lead to a significant influence with the spectral resolution of a SHS system. Theoretical models for analyzing the alignment errors which are divided into three kinds are presented in this paper. Based on these models, the tolerance angle of these errors has been given, respectively. The result of simulation experiments shows that when the angle of slope error, tilt error, and rotation error are less than 1.21°, 1.21°, 0.066° respectively, the alignment reaches an acceptable level.

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Optical design of imaging system based on spatial heterodyne spectrometer

Cited by 3 publications

References 0 publications

Research on correction method of saturation interference data of space heterodyne spectrometer

Research on correction method of saturation interference data of space heterodyne spectrometer

Research on calculation method of on-orbit instrumental line shape function for the Greenhouse Gases Monitoring Instrument on the GaoFen-5B satellite

Alignment error analysis of detector array for spatial heterodyne spectrometer

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