Interference of backscatter from two droplets in a focused continuous-wave CO2 Doppler lidar beam.
With a focused continuous-wave CO(2) Doppler lidar at 9.1-microm wavelength, the superposition of backscatter from two appromately 14.12-microm-diameter silicone oil droplets in the lidar beam produced interference that resulted in a single backscatter pulse from the two droplets with a distinct periodic structure. This interference is caused by the phase difference in backscatter from the two droplets while they are traversing the lidar beam at different speeds, and thus the droplet separation is not constant. The complete cycle of interference, with periodicity 2pi, gives excellent agreement between measurements and lidar theory.
Jarzembski
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Global Hydrology and Climate Center, 977 Explorer Boulevard, Huntsville, Alabama 35806, USA. maurice.jarzembski@msfc.nasa.gov
Srivastava
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