TDLAS stands for Tunable Diode Laser Absorption Spectroscopy, and it is a technique used for gas sensing and analysis. TDLAS gas modules are devices that utilize this spectroscopy technique to measure the concentration of specific gases in a sample.

In TDLAS, a laser diode emits light at a specific wavelength that is absorbed by the target gas molecules. By measuring the amount of light absorbed by the gas sample, the concentration of the gas can be determined. TDLAS offers high sensitivity, selectivity, and accuracy in gas analysis, making it suitable for various applications such as environmental monitoring, industrial process control, and scientific research.

TDLAS gas modules typically consist of a laser source, optical components, a gas cell or sampling system, and a detector. The laser emits light at specific wavelengths that correspond to the absorption lines of the target gas. The light is then transmitted through the gas sample, and the amount of absorbed light is measured by the detector. Based on the absorption signal, the gas concentration can be calculated.

These gas modules are often integrated into larger systems or instruments for specific applications. They may include additional features such as temperature and pressure compensation, data logging capabilities, and communication interfaces for data transfer and control.

Overall, TDLAS gas modules are widely used for precise and reliable gas analysis in various industries and research fields.