Topic
Spectrograph
About: Spectrograph is a research topic. Over the lifetime, 7272 publications have been published within this topic receiving 129932 citations.
Papers published on a yearly basis
1 / 3
Papers
TL;DR: The Visible Integral-Field Replicable Unit Spectrograph (VIRUS) as mentioned in this paper is an instrument comprising approximately 150 individual IFU-fed spectrographs which will be mounted on the telescope structure.
Abstract: The Hobby-Eberly Telescope (HET) is an existing innovative large telescope of 9.2 meter aperture, located at the McDonald Observatory in West Texas. The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) requires a major upgrade to the HET, including a substantial increase in the telescope field of view, as well as the development and integration of a revolutionary new integral field spectrograph called VIRUS. The Visible Integral-Field Replicable Unit Spectrograph (VIRUS) is an instrument comprising approximately 150 individual IFU-fed spectrographs which will be mounted on the telescope structure. Each spectrograph has a CDD camera detector package which must be cryogenically cooled during scientific operation. In order to cool each of these camera systems a liquid nitrogen system has been proposed and design study completed. The proposed system includes: a liquid nitrogen source, vacuum jacket distribution system, local storage on the telescope, and distribution under a thermal siphon to the individual spectrographs and local thermal connectors.
23 citations
TL;DR: The most difficult design problem was the elimination of stray light when used with the sun, and of the several methods investigated, the most effective was a predispersing system in the form of a zero-dispersion double monochromator.
Abstract: An echelle grating spectrograph is ideal for use in a rocket when high resolution is required becaus itoccupies a minimum of space. The instrument described covers the range 4000-2000 A with a resolution of 0.03 A. It was designed to fit into the solar biaxial pointing-control section of an Aerobee-150 rocket. The characteristics of the spectrograph are illustrated with laboratory spectra of iron and carbon are sources and with solar spectra obtained during rocket flights in 1961 and 1964. Problems encountered in analyzing the spectra are discussed. The most difficult design problem was the elimination of stray light when used with the sun. Of the several methods investigated, the most effective was a predispersing system in the form of a zero-dispersion double monochromator. This was made compact by folding the beam four times.
23 citations
TL;DR: In this paper, the authors present the as-built performance of the multiple EUV grating spectrograph (MEGS) optical design, including spectral resolution, wavelength shift, focus and alignment.
Abstract: The NASA Solar Dynamics Observatory (SDO), scheduled for launch in 2009, incorporates a suite of instruments
including the EUV Variability Experiment (EVE). The EVE instrument package contains grating spectrographs that will
measure the solar extreme ultraviolet (EUV) irradiance from 0.1 to 105 nm. The Multiple EUV Grating Spectrograph
(MEGS) channels use concave reflection gratings to image solar spectra onto CCDs. MEGS will provide 0.1nm
spectral resolution between 5-105nm every 10 seconds with an absolute accuracy of better than 25% over the SDO 5-
year mission. MEGS-A utilizes a unique grazing-incidence, off-Rowland circle (RC) design to minimize angle of
incidence at the detector while providing ≥ 0.1nm resolution between 5-37 nm. MEGS-B utilizes a double-pass, cross-dispersed
double-Rowland circle design while providing ≥ 0.1nm resolution between 35-105 nm. We present the as-built
performance of the MEGS optical design, including spectral resolution, wavelength shift, focus and alignment.
23 citations
TL;DR: An account is given of various spectromicrographic techniques used for ultraviolet microscopy, which has been used on a wide range of materials including cells, fibres and crystals, with both polarized and unpolarized light.
23 citations
TL;DR: In this article, the authors describe the design and first-light early science performance of the Shane Adaptive optics infraRed Camera- Spectrograph (ShARCS) on Lick Observatory's 3m Shane telescope.
Abstract: We describe the design and first-light early science performance of the Shane Adaptive optics infraRed Camera- Spectrograph (ShARCS) on Lick Observatory’s 3-m Shane telescope. Designed to work with the new ShaneAO adaptive optics system, ShARCS is capable of high-efficiency, diffraction-limited imaging and low-dispersion grism spectroscopy in J, H, and K-bands. ShARCS uses a HAWAII-2RG infrared detector, giving high quantum efficiency (<80%) and Nyquist sampling the diffraction limit in all three wavelength bands. The ShARCS instrument is also equipped for linear polarimetry and is sensitive down to 650 nm to support future visible-light adaptive optics capability. We report on the early science data taken during commissioning.
23 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2026 | 1 |
| 2025 | 121 |
| 2024 | 373 |
| 2023 | 296 |
| 2022 | 1,716 |
| 2021 | 141 |