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What is TDLAS

The laser gas analyzer is based on Tunable Diode Laser Absorption Spectroscopy (TDLAS), which uses the narrow line width and tunable characteristics of semiconductor lasers to analyze individual absorption lines of gas molecules. The laser frequency is modulated by modulating the working current of the semiconductor laser, so that when the laser beam of a specific wavelength emitted by the semiconductor laser passes through the measuring pipeline, it is frequency-selectively absorbed by the measured gas, and the laser intensity is attenuated. The lock-in amplifier is used to photoelectricity at the receiving end. The optical signal detected by the detector is demodulated, and combined with the Beer-Lambert relationship between the gas concentration and the laser absorption spectrum, the concentration of the measured gas is obtained.

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