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A spectrograph in which the output spectrum is scanned by a photoelectric photometer to produce a record of how the intensity of a spectrum varies with wavelength. A modern example is the radial velocity spectrometer, in which the positions of the spectral lines are measured to deduce the radial velocity of the star. Otherwise, spectrometers are now rarely used because CCD detectors can record large regions of a spectrum at once, and the device is then known as a spectrograph.

Subjects: Science and Mathematics.

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