Absorption based Sensors

TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a powerful tool in many sensing applications. Tunable diode lasers are powerful, narrow linewidth light sources capable of measuring the absorption of gaseous species very accurately. Using appropriate spectroscopic models the concentration of a molecular species can be calculated from the integrated absorption when scanning the laser source across a particular transition provided that the spectral region is free of background absorption from other species.