FIELD: measuring.
SUBSTANCE: invention relates to recording the speed of a moving object. A Doppler device for measuring the speed of a moving surface based on an interferometer with fibre radiation input comprises at least one measuring module with laser radiation sources for forming pairs therefrom and forming reference and probing branches of measuring channels in which the sources differ from each other and in pairs in frequency, and which also include optical transmitters of radiation, reflected radiation amplifiers, oscilloscope with photodetectors, wherein the probing branches are equipped with high-speed fibre switches with pulse generators, through which the reflected signal from the amplifiers through the fibre delay line is transmitted to the multiplexer, wherein the fibre delay lines differ from each other in length.
EFFECT: high accuracy of obtained data when recording the speed of a moving object.
1 cl, 1 dwg
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