Spectral Resolution

The spectral resolution of a spectrograph, or, more generally, of a frequency spectrum, is a measure of its ability to resolve features in the electromagnetic spectrum. It is usually denoted by, and is closely related to the resolving power of the spectrograph, defined as


where is the smallest difference in wavelengths that can be distinguished at a wavelength of . For example, the Space Telescope Imaging Spectrograph (STIS) can distinguish features 0.17 nm apart at a wavelength of 1000 nm, giving it a resolution of 0.17 nm and a resolving power of about 5,900. An example of a high resolution spectrograph is the Cryogenic High-Resolution IR Echelle Spectrograph (CRIRES) installed at ESO's Very Large Telescope, which has a spectral resolving power of up to 100,000.

Read more about Spectral ResolutionDoppler Effect, IUPAC Definition, See Also

Other articles related to "spectral resolution, resolution":

Image Resolution - Resolution of Digital Images - Spectral Resolution
... Color images distinguish light of different spectra ... Multispectral images resolve even finer differences of spectrum or wavelength than is needed to reproduce color ...
Herschel Space Observatory - Instrumentation
... detectors PACS (Photodetecting Array Camera and Spectrometer) An imaging camera and low-resolution spectrometer covering wavelengths from 55 to 210 micrometres ... The spectrometer has a spectral resolution between R=1000 and R=5000 and is able to detect signals as weak as −63 dB ... It operates as an integral field spectrograph, combining spatial and spectral resolution ...
Electron Paramagnetic Resonance - High-field High-frequency Measurements
... However, the low spectral resolution over g-factor at these wavebands limits the study of paramagnetic centers with comparatively low anisotropic magnetic parameters ... The higher spectral resolution over g-factor, which increases with irradiation frequency and external magnetic field B0 ... The figure shows how spectral resolution improves with increasing frequency ...
Spectral Resolution - See Also
... Angular resolution Resolution (mass spectrometry). ...
Resurs-DK1 - Spectral Resolution
... Green, red and near IR are typically combined to make a traditional false color composite where the near IR is displayed in red, the red is displayed in green, and the green is displayed in blue ... This combination is favoured by scientists because near IR is useful for detection of numerous vegetation types ...

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