comparison spectrum

comparison spectrum

The spectrum of one or more known substances under terrestrial conditions that is used in astronomy as a standard of comparison for investigating spectra of celestial objects; it provides, for example, a zero Doppler shift.

comparison spectrum

[kəm′par·ə·sən ‚spek·trəm]
(spectroscopy)
A line spectrum whose wavelengths are accurately known, and which is matched with another spectrum to determine the wavelengths of the latter.
References in periodicals archive ?
For each biomolecule, the mean of the spectra for the 20 g/L solution was used as the comparison spectrum for spectra subtractions.
Such guiding errors would be far less pronounced in the second comparison spectrum, which was exposed with the benefit of a half hour of practice guiding the first spectrum and for only one-third the duration.
This time he saw no "peculiarities in the appearance of the crater," so no comparison spectrum was made.

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