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Velocities are measured with a Doppler-LIDAR by measuring the frequency shift of the backscattered radiation. This Doppler-shifted signal is heterodyned with a local oscillator radiation which has the same frequency as the transmitted signal. The laser of this Doppler-LIDAR technique combines three functions of a LIDAR.
- The laser is the transmitter of radiation.
- It acts as a amplifier of the backscattered signal.
- It serves the local oscillator radiation.
© 1991 Optical Society of America
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