Development and initial testing of a fiber-fed Fourier transform spectrograph for solar spectroscopy

Pornapa Artsang; Pakakaew Rittipruk; Panomsak Meemon; Sirinrat Sithajan; Supachai Awiphan; Ponlawat Yoifoi; Christophe Buisset

doi:10.1117/12.3018956

18 July 2024 Development and initial testing of a fiber-fed Fourier transform spectrograph for solar spectroscopy

Pornapa Artsang, Pakakaew Rittipruk, Panomsak Meemon, Sirinrat Sithajan, Supachai Awiphan, Ponlawat Yoifoi, Christophe Buisset

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130968H (2024) https://doi.org/10.1117/12.3018956
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Fourier Transform Spectrograph (FTS) stands as a powerful tool for astronomers in characterizing the composition of celestial bodies through their emitted light. In this study, we introduce the development and initial performance evaluation of a fiber-fed FTS, specifically tailored for solar observations within the 600-1000 nm wavelength range. To improve measurement precision, we integrated a stabilized He-Ne laser as a metrology wavelength source. This setup generates a monochromatic interferogram in parallel with the scientific interferogram, allowing for adaptive correction of the instrument's non-linear scan characteristics that affect the phase information of the scientific interferogram. For wavelength calibration, we employed well-defined oxygen (O₂) lines as a reference. The comparison of the solar spectrum measured with our system against a simulated model showed good agreement affirming the system's efficacy. Additionally, we discuss the wavelength calibration using O₂ lines in the telluric region, offering insights into the system's repeatability. The analysis of the Fe-I absorption line within these lines further enabled us to determine the Sun's rotational velocity.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Pornapa Artsang, Pakakaew Rittipruk, Panomsak Meemon, Sirinrat Sithajan, Supachai Awiphan, Ponlawat Yoifoi, and Christophe Buisset "Development and initial testing of a fiber-fed Fourier transform spectrograph for solar spectroscopy", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130968H (18 July 2024); https://doi.org/10.1117/12.3018956

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