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Appl Opt. 1981 Jul 15;20(14):2534-8. doi: 10.1364/AO.20.002534.

Air pollution monitoring with a Q-switched CO(2)-laser lidar using heterodyne detection.


A differential absorption lidar (DIAL) using a Q-switched CO(2) laser and a heterodyne receiver has been developed. The DIAL system is highly automated with computer-controlled laser-line selection and signal processing. The transmitter operates at a pulse-repetition frequency of 20 kHz and has an average output power of 1.8 W. A wideband HgCdTe detector is used together with a high speed adding buffer to detect the return signals. The system has been used in a field experiment to monitor ethylene emission from a petrochemical factory.

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