Single frequency lasers have long been the cornerstone of standoff gas detection, particularly in both traditional LIDAR (Light Ranging and Detection), DIAL (Differential Absorption LIDAR), and TDLAS (Tunable Diode Laser Absorption Spectroscopy). More recently as single frequency laser diodes have become more common and less expensive they are being utilized in more localized and industrial gas sensing applications as well. These compact laser absorption gas sensors, which may depend on either passive air flow of vacuum suction, are rapidly replacing the older plasma emission systems, particularly for single species detection.
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