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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
A spectrometer is used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities.Spectrometer is a term that is applied to instruments that operate over a very wide range of wavelengths, from gamma rays and X-rays into the far infrared.If the instrument is designed to measure the spectrum in absolute units rather than relative units, then it is typically called a spectrophotometer.pectrometers are used in many fields. For example, they are used in astronomy to analyze the radiation from astronomical objects and deduce chemical composition. The spectrometer uses a prism or a grating to spread the light from a distant object into a spectrum.