What are the parts of a spectrograph?
The five basic components of an astronomical spectrograph are the slit, collimator, grating, camera and detector. The roles of each of these components are described in more detail below. The slit is a mask with a narrow rectangular aperture that is placed in the focal plane of the telescope.
What is high resolution spectroscopy?
The High-Resolution Spectroscopy Facility studies the spectrally-resolved radiative properties of matter (extinction, emission, and reflection) at high spectral resolution across a wide span of the electromagnetic spectrum.
What is the difference between spectrometer and spectrograph?
is that spectrograph is a machine for recording spectra, producing spectrograms while spectrometer is (analytical chemistry) an optical instrument for measuring the absorption of light by chemical substances; typically it will plot a graph of absorption versus wavelength or frequency, and the patterns produced are used …
How is a spectrograph used in astronomy?
A spectrograph is an instrument used to obtain and record an astronomical spectrum. The spectrograph splits or disperses the light from an object into its component wavelengths so that it can be recorded then analysed.
Is spectrometer and spectroscope same?
Technically, a spectrometer can function over any range of light, but most operate in a particular region of the electromagnetic spectrum. A spectroscope is a device that measures the spectrum of light.
What are the low resolution spectrographs?
The low Resolution Spectrographs (LRSs) The 16 low resolution spectrographs are the main survey instruments for LAMOST. These spectrographs have been put into operation and observation in Xinglong Observatory since late 2008. Each of the 16 low resolution spectrographs can accommodate 250 fibers.
What is the spectral resolution of the LAMOST spectrophotometer?
The 16 spectrographs used in LAMOST are low-resolution mode with 2/3 slits. The spectral resolution is R=1500. In the future, one can change the spectral resolution by replacing gratings or slits.
What is the range of the spectrographs?
The spectrographs can obtain spectrums of 4000 celestial objects simultaneously via fibers of 3.3 arc second located in 5 degree field of view of the telescope. The wavelength range of each spectrograph is from 370nm to 900nm, and spectral resolution is 1000 or 5000 by using different gratings and changing cameras to different positions.
How many fibers can the spectrographs accommodate?
Each of the 16 low resolution spectrographs can accommodate 250 fibers. The spectrographs can obtain spectrums of 4000 celestial objects simultaneously via fibers of 3.3 arc second located in 5 degree field of view of the telescope.