The MIC-600 laser analyzer adopts the principle of Tunable Diode Laser Absorption Spectroscopy (TDLAS), which is the \"single-line spectrum\" measurement technology. Using a high-stability, low-noise quantum cascade QCL tunable laser as the light source, the laser frequency is modulated by modulating the working current intensity of the semiconductor laser, so that the laser scanning range is slightly larger than the single absorption spectrum of the measured gas, and phase-locked amplification is adopted. Technology, when a laser beam of a specific wavelength emitted by a semiconductor laser passes through the measuring tube, it is frequency-selectively absorbed by the gas to be measured, resulting in attenuation of the laser intensity. Therefore, the system uses different characteristic absorption lines for different gas components and the Beer-Lambert relationship between gas concentration and infrared or laser absorption spectra, and can be obtained by detecting the absorption size of the absorption line (ie, laser intensity attenuation information) The concentration of the gas being measured. Since only the light of the characteristic wavelength of the gas to be measured is emitted, and only the gas to be measured can absorb the light of this wavelength, it is not interfered by the background gas, effectively overcomes the interference of water vapor, dust and other factors, and realizes accurate and rapid measurement. The process gas composition can be measured. The concentration of the specific gas in, including CO, CO2, CH4, O2, H2S, HCL, H2O, HF, NH3, NO2, NO, SO2, SO3, N2O, etc. The system has the characteristics of high sensitivity, fast response speed, almost no drift, no interference from background gas, non-contact optical measurement and so on.
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