Conclusions
Theoretical and experimental investigations have shown that the application of the Doppler effect makes it possible to measure the velocities of oscillating objects with specular reflecting surfaces over the range from 10−6 to 160 m/sec, when the reflecting surface is several hundreds of meters distant from the measuring instrument and using a photomultiplier with a frequency resolution of up to 1 GHz. Shortening of the distance between the reflecting surface of the object and the measuring instrument to 5 to 10 m permits the amplitudes of mechanical oscillations of nonspecular surfaces to be measured over the range of a few microns to a millimeter. It is shown that the heterodyne method for reception of the data is favorably different from other interference methods. Its main advantage is the possibility of determining the sign of the velocity being measured and to carry out the analysis of an electrical signal of intermediate frequency over a frequency range above the region of low-frequency noise of the phototransducer.
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Literature cited
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Additional information
Translated from Izmeritel'naya Tekhnika, No. 9, pp. 65–67, September, 1972.
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Zastrogin, Y.F. Measurement of the parameters of mechanical oscillations by optical-interferometry methods. Meas Tech 15, 1393–1396 (1972). https://doi.org/10.1007/BF00815107
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DOI: https://doi.org/10.1007/BF00815107