spectrometru

A spectrometru (Romanian for spectrometer) is a scientific instrument used to measure and analyze the spectral properties of light or other signals. It is designed to separate light into its component wavelengths and to record the intensity at each wavelength, producing a spectrum that can be used to identify substances, quantify concentrations, or study physical processes.

Most optical spectrometers rely on dispersion to separate wavelengths, using prisms or diffraction gratings. Light from a source or a sample is focused onto the dispersive element, which spreads it into a spectrum that is detected by a photodetector array or a single detector with scanning. Detectors can include photomultiplier tubes, photodiodes, or charge-coupled devices; data are processed to yield a spectrum showing intensity versus wavelength or frequency.

There are several families of spectrometers, including optical emission spectrometers, which analyze light emitted by excited samples; UV–visible spectrophotometers for absorption measurements; infrared spectrometers for vibrational spectra; and mass spectrometers, which separate ions by mass-to-charge ratio and provide elemental or molecular information. Some instruments combine multiple techniques, such as UV–Vis with fluorescence detection.

Applications span chemistry, physics, astronomy, environmental monitoring, materials science, and medicine. They are used to identify elements by emission lines, determine concentrations from absorption or emission data, and characterize molecular structure from vibrational spectra. Accuracy depends on calibration against known standards, spectral resolution, and detector performance; common calibration tasks include wavelength and intensity calibration, instrument alignment, and baseline correction.