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spectrograph
A spectrograph is an instrument that separates light into a frequency spectrum and records the signal using a camera. There are several kinds of machines referred to as ''spectrographs'', depending on the precise nature of the waves. The term was first used in July, 1876 by Dr. Henry Draper when he invented the earliest version of this device, and which he used to take several photographs of the spectrum of Vega. This earliest version of the spectrograph was cumbersome to use and difficult to manage.〔Memoir of Henry Draper, 1837-1882 by George Barker. Page 103: http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/draper-henry.pdf〕
One way to define a spectrograph, is a device that separates light by its wavelength, and records this data.〔(Spectrometer, Spectroscope, and SpectrographExcerpt from Field Guide to Spectroscopy )〕 A spectrograph typically has a multi-channel detector system or imaging system that detects the spectrum of light.〔(Spectrometer, Spectroscope, and SpectrographExcerpt from Field Guide to Spectroscopy )〕
==Stellar & solar spectrograph==
The first spectrographs used photographic paper as the detector. The star spectral classification and discovery of the main sequence, Hubble's law and the Hubble sequence were all made with spectrographs that used photographic paper. The plant pigment phytochrome was discovered using a spectrograph that used living plants as the detector. More recent spectrographs use electronic detectors, such as CCDs which can be used for both visible and UV light. The exact choice of detector depends on the wavelengths of light to be recorded.
The forthcoming James Webb Space Telescope will contain both a near-infrared spectrograph (NIRSpec) and a mid-infrared spectrometer (MIRI).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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