TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology uses a tunable diode laser for precise gas analysis. The laser emits a narrow beam of light at a specific wavelength that matches the absorption characteristics of the target gas. When this beam passes through the gas and reflects off a surface, part of the light is absorbed by gas molecules. A sensor captures the reflected beam, and the gas concentration is determined by measuring the reduction in light intensity.