page_title: Spectroscopy
section_title: Applications
hierarchical_section_title: Spectroscopy / Applications
caption_attribution_description: English: Every day, before the observations start, each telescope undergoes a complete start up during which each of its function is checked, like a plane before take off. Here, Kueyen, the second Unit Telescope, is ready for the night. The instrument in the foreground is UVES, the high-resolution spectrograph. Italiano: L'unita UT2 del complesso VLT con il primo piano lo spettrografo UVES
context_page_description: Spectroscopy, is the study of the electromagnetic spectrum of a source of electromagnetic radiation. Generally the spectrum is the analysis, the decomposition of a physical quantity in the energy domain, or in the frequency, the wavelength, etc..
  Spectroscopy is the study of the interaction between matter and electromagnetic radiation as a function of the wavelength or frequency of the radiation. Historically, spectroscopy originated as the study of the wavelength dependence of the absorption by gas phase matter of visible light dispersed by a prism. An elementary description of absorption, emission and scattering spectroscopy is given in Chapter 1 of a student level text book. We can also consider matter waves and acoustic waves as forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory.
context_section_description: Cure monitoring of composites using optical fibers.
  Estimate weathered wood exposure times using near infrared spectroscopy.
  Measurement of different compounds in food samples by absorption spectroscopy both in visible and infrared spectrum.
  Measurement of toxic compounds in blood samples
  Non-destructive elemental analysis by X-ray fluorescence.
  Electronic structure research with various spectroscopes.
caption: UVES is a high-resolution spectrograph on the Very Large Telescope.[17]
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