A new detection method is presented for detecting the weak optical signal scattered back from a topographic target. The weak signal arriving from the topographic target is amplified by the frequency modulated transmitter laser of a LIDAR system and the amplified signal is mixed with the frequency shifted transmitter laser beam. The method is used in a differential absorption LIDAR for remote sensing of molecular air pollution. © 1991.
Péczeli, I., Richter, P., & Gazdag, L. (1992). Non-conventional coherent LIDAR for investigating atmospheric pollution. Spectrochimica Acta Part A: Molecular Spectroscopy, 48(1), 45–49. https://doi.org/10.1016/0584-8539(92)80197-5