Measuring the Near-IR Airglow Continuum with Stray Light Reduced Spectrograph
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Documents
- SPIE-AS22-323c2566-9b6e-ec11-a98e-00505691c5e1
Final published version, 1.02 MB, PDF document
We present an experimental spectrograph based on a new type of a white pupil echelle spectrograph designed for interline sky continuum measurement. This is an application which requires extremely low instrumental scattered light background and high spectral fidelity due to the faintness of the signal and the fact that the night sky is illuminated by bright hydroxyl emission lines from the red-end of visual spectrum through near infrared wavelengths. The conceptual design is a white pupil echelle spectrograph using a single grating in double pass. The xy-plane of the optical beam is rotated between the two consecutive dispersions thus redirecting the scattered 'grating grass' light from the grating to different direction respective to the spectrum. A mask in the secondary focus prevents this scattered light reaching the camera. The beam rotation is achieved with a normal right-angle prism allowing us to use off-the-shelf optical components and classical geometrical optics to mitigate the issue of hydroxyl airglow emission lines.
Original language | English |
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Article number | 1218465 |
Journal | Proceedings of SPIE |
Volume | 12184 |
Number of pages | 7 |
ISSN | 0277-786X |
DOIs | |
Publication status | Published - 29 Aug 2022 |
Event | Conference on Ground-Based and Airborne Instrumentation for Astronomy IX - Montreal, Canada Duration: 17 Jul 2022 → 22 Jul 2022 |
Conference
Conference | Conference on Ground-Based and Airborne Instrumentation for Astronomy IX |
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Country | Canada |
City | Montreal |
Period | 17/07/2022 → 22/07/2022 |
- Airglow, airglow continuum, near infrared, spectroscopy, echelle, spectral purity, atmospheric emission, OH SUPPRESSION
Research areas
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