Spectroscopy and Spectral Analysis Compressed air microwave plasma emission spectroscopy mainly includes microwave plasma generating devices, gas supply systems and spectrometry systems. in. At 1 atm pressure, the air microwave plasma emission spectrum is dominated by the band continuous spectrum. The typical continuum is the N2 (CB) band spectrum with 213 as the head, and the O atom characteristics of 777.23 and 777.42 nm wavelengths exist simultaneously. Spectral line. Under other conditions, as the working pressure increases, the continuum intensity in the wavelength range of 200 365 nm generally increases. The line spectral intensity of metal atoms gradually increases and more metal atomic line spectra appear. The characteristics of the band spectra of NO and N2 (CB) generally show a tendency of gradual weakening or even disappearing. The intensity of the characteristic line of O atom is generally weakened first and then stabilized. It should be pointed out that since the material of the coupling device is a copper alloy, the material of the cavity is aluminum alloy, and the coupling device and the surface of the cavity contain metal elements such as potassium and sodium, so the coupling device and the metal elements on the cavity are in microwave plasma. It is excited by the body to easily form a metal atom emission spectrum. For example, the 285.11 nm line spectrum is the Cu atom characteristic line, 265. The spectrum is the A1 atom characteristic line, and the 285. 25 nm line spectrum is the Na atom characteristic line. The relevant metal atom line parameters can be found under NIST. Z2 under different incident powers. Air microwave plasma spectral characteristics and air microwave plasma emission spectra at different incident microwave powers such as 860 W, the main characteristic lines are as shown. It can be seen that, with other conditions unchanged, as the power of the incident microwave spectroscopy and spectral analysis decreases, the NO band spectrum led by 24 nm and the N2 (CB) band spectrum led by 295. 51 nm are observed. The intensity of the O atom at 777.23 and 777.42nm wavelengths is gradually weakened, and the intensity of the Cu atom at 324 80 and 327.45 nm is gradually weakened. 3 Conclusions Using the microwave cavity generator and spectral measurement system based on cylindrical cavity, the emission spectra of compressed air microwave plasma under different working pressures and different incident microwave powers were measured, and the characteristic distribution and variation of emission spectra were analyzed. trend. The results show that the microwave plasma emission spectrum of compressed air exhibits significant band-like spectral characteristics under normal pressure. When other conditions are constant, the NO-band continuum and N2 of compressed air microwave plasma increase with the increase of working pressure. The (CB) band continuum features gradually weaken or even disappear, the O atom characteristic line tends to be stable, and the spectral features of the metal element atom line are gradually prominent; when other conditions are constant, the NO band continuum spectrum decreases with the incident microwave power. The intensity of the N2(CB) band continuum is gradually weakened and the band spectrum is still significant. The intensity of the O atom's characteristic line is gradually weakened, and the spectral intensity of the metal element is gradually weakened. Spectroscopy and Spectral Analysis Welcome Submission Welcome to subscribe to welcome advertisements abroad code: M848 Jingxi Industrial and Commercial Guangzi No. 0441, various industries and various disciplines such as food, agriculture, commodity inspection and customs. 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