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Grating Spectrometer Designs

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Grating Spectrometer Designs

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A spectrograph is a spectrometer that images a range of wave-lengths simultaneously, either onto photographic film or a series of detector elements, or through several exit slits (sometimes called a polychromator). The defining characteristic of a spectrograph is that an entire section of the spectrum is recorded at once.Plane grating monochromator mounts have an exit slit through which a narrow spectral region passes; the center wavelength of this spectra region is changed by rotating the grating. Alternatively, a wide spectral region can be imaged at once by leaving the grating fixed and using a series of exits slits (or an array of detector elements) in a focal plane. Such optical systems are called spectrographs.

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