FIELD: physics.
SUBSTANCE: advantage of the disclosed method becomes apparent when using pulsed lasers with pulse duration shorter than one nanosecond. The method involves generation of a continuous reference signal by using backward scattered light which is picked up by a directional coupler, with propagation of an input light pulse in an annular fibre-optic delay line with a repeating generation cycle and regeneration of the sequence of such input light pulses.
EFFECT: high accuracy and noise-immunity of measuring Doppler signals, broader functionalities; method does not have any limitations when using lasers with short atmospheric probing pulses; simple and cheap optical and electronic parts of the device.
2 dwg
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