Line Spectra

Spectra generated by excited substances. Consists of radiation with only specific wavelengths, corresponding to transitions between states in free atoms.

Example: The line spectrum of hydrogen contains 4 sharp lines in the visible part of the spectrum.

A line spectrum is a spectrum where the energy is concentrated at specific frequencies (lines or bins), as opposed to a continuous spectrum where the energy is smeared out over a band of frequencies.

A deterministic signal will have a line spectrum, and a random signal will have a continuous spectrum.

Spectra generated by machine vibration signatures are always a combination of these two types.

See also: Band Spectrum, Continuous Spectrum.

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Subjects: Physics