A spatial heterodyne spectrometer for diffuse H-α spectroscopy

Sheinis, Andrew; Mierkiewicz, E. J.; Roesler, F. L.; Harlander, John M.; Bodkin, Andrew

doi:10.1117/12.788470

Cited by 3 publications

(2 citation statements)

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“…Other attempts have been made to limit the spectral density within an SHS interferogram, notably the echelle grating SHS variant that utilizes various high diffraction grating orders to spatially offset narrow bandpasses onto an CCD. 11 The echelle grating SHS variant has been demonstrated in a proof-of-concept sense, although wavelength calibration must be performed separately for each diffraction order and cross-interference from different orders makes interpreting echelle SHS spectra non-trivial.…”

Section: Introductionmentioning

confidence: 99%

Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

2020

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Section: Introductionmentioning

confidence: 99%

Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

2020

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“…Various configurations of the SHS have been developed as proof-of-concept laboratory prototype or ground-based instrumentation in the long-wave infrared 3 , near-infrared 4,5 , visible [6][7][8] , and near ultraviolet 8 . The SHS's small size, and the fact that it does not require any moving parts during operation, makes it robust enough to be flown in space.…”

Section: Introductionmentioning

confidence: 99%

Description and ray-tracing simulations of HYPE: a far-ultraviolet polarimetric spatial-heterodyne spectrometer

Bétrémieux

Corliss

Vincent

et al. 2010

Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray

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Temperature and velocity-distribution remote-sensing of faint diffuse sources such as the interplanetary medium (IPM), comets and planetary atmospheres, is an instrumental challenge that becomes more pronounced in the ultraviolet. Allreflective Spatial-Heterodyne Spectrometers (SHS), an emerging new class of instruments that combines both high étendue and high resolving power (greater than 10 5 ), are ideally suited to these types of observations. Their all-reflective configuration and their self-compensating monolithic design enable them to operate under the tight tolerances of the ultraviolet and to survive the rigors of space launch. An in-development sounding-rocket experiment, the Hydrogen Polarimetric Explorer (HYPE), will merge an all-reflective SHS with a half-wave Brewster reflection polarimeter to obtain the first interferometric polarimetry of an ultraviolet emission line source. Its initial flight will target the IPM at the hydrogen Lyman-alpha transition (121.6nm). HYPE's novel optical configuration also combines several improvements in reflective SHS design, including true zero-path interferometry, no aliasing, and one-dimensional imaging. The optical layout and performance of the HYPE prototype will be described along with simulation results from ray-tracing computations.

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Compact Spatial Heterodyne Spectrographs for Future Space-Based Observations: Instrument Modeling and Applications

Sahoo,

Mathew,

Battisti

et al. 2024

Sensors

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High-resolution spectroscopy employing spatial heterodyne spectrographs (SHS) holds significant promise for forthcoming space missions, building upon its established track record in science applications. Notably, it offers exceptional performance and cost- effectiveness in the ultraviolet-visual (UV-Vis) region compared to contemporary instruments. SHS instruments provide high-resolution capabilities and substantially larger etendues than similar resolving power instruments. This study introduces a comprehensive Python-based SHS model integrated with a user-friendly web scraping interface for target star selection, parameter generation, and 2D interferogram creation. Our SHS model demonstrates double the resolving power of a grating spectrometer and a throughput comparable to a Fourier transform spectrometer (FTS) but without moving parts, enhancing robustness for deployment in space. The interferogram processing algorithm includes flat-fielding, bias removal, apodization, and an inverse Fourier transform (IFT) for accurate spectrum retrieval. Despite bandwidth limitations due to resolving power constraints, SHS models excel in applications requiring high spectral resolution over narrow wavelength ranges, such as studying isotopic emission lines. The model provides optimization results and trade-offs for system parameters, ensuring precise spectral recovery with realistic signal-to-noise ratio (SNR) values. SHS is versatile and effective for various scientific applications, including investigating atomic and molecular emissions from comets, planetary atmospheres, the Earth’s atmosphere, the Sun, and the interstellar medium (ISM). This research significantly contributes to expediting the development and deployment of SHS instruments, demonstrating their potential across numerous scientific domains.

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A spatial heterodyne spectrometer for diffuse H-α spectroscopy

Cited by 3 publications

References 0 publications

Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

Description and ray-tracing simulations of HYPE: a far-ultraviolet polarimetric spatial-heterodyne spectrometer

Compact Spatial Heterodyne Spectrographs for Future Space-Based Observations: Instrument Modeling and Applications

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