"Spectral fingerprints" refers to unique patterns or signatures of light waves emitted or absorbed by a particular substance. These patterns can be used to identify or distinguish that substance from others. Full definition
It will be powerful enough to yield detailed spectral fingerprints of a sample of nearby inhabited Earth - mass planets in the «Goldilocks» zone. (seeker.com)
HHXRF technology now allows you to conduct spectral fingerprints of your production line to determine the source of the metal contamination for quick action and repair. (foodproexh.com)
«Hence, this wavelength range is called the «spectral fingerprint region.» (sciencedaily.com)