Spectrum detection is to identify substances and determine their chemical composition and relative content according to their spectra.

According to the analysis principle, spectral analysis can be divided into two types: emission spectral analysis and absorption spectral analysis.

According to the form of the measured components, it can be divided into atomic spectroscopic analysis and molecular spectroscopic analysis. Spectroscopic detection is called atomic spectroscopy if the measured components are atoms, and molecular spectroscopy if the measured components are molecules.