TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology uses a tunable diode laser for precise gas analysis. The laser emits a focused beam of light at a specific wavelength that corresponds to the absorption characteristics of the target gas. When this beam interacts with the gas, some of the light is absorbed by the gas molecules. A sensor then captures the reflected beam, and the concentration of the gas is determined by measuring the intensity of reflected light.