Conclusions
It has been established experimentally that the most interference immune of the existing laser Doppler vibrometer schemes is that in which the signal is processed at a subcarrier frequency, for example, with positive phase modulation of one of the beams in a two beam interferometer.
We have shown that the number of fringes is doubled when the signal is separated at the subcarrier, which enables us by means of the zero count method to increase the accuracy with which the parameters of motion can be determined.
We have proposed and studied experimentally a scheme for a vibrometer for directly measuring the parameters of a vibrating surface by means of an improved two beam interferometer possessing minimum optical losses.
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Literature cited
B. S. Rinkevichus, Usp. Fiz. Nauk,3, No. 2 (1973).
A. I. Kartashev and I. Sh. étsin, Usp. Fiz. Nauk,106, No. 4 (1972).
Yu. N. Malinin and Yu. E. Pol'skii, Inventors' Certificate No. 301558, Byul. Izobret., No. 14 (1971).
V. I. Voronov and Yu. E. Pol'skii, Prib. Tekh. Eksp., No. 6 (1970).
G. Kart'yanu, Frequency Modulation [in Rumanian], Meridiane, Bucharest (1964).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 10, pp. 49–51, October, 1977.
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Il'yasov, R.S., Malinin, Y.N. & Pol'skii, Y.E. Laser vibrometer with increased accuracy and interference immunity. Meas Tech 20, 1470–1472 (1977). https://doi.org/10.1007/BF00824271
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DOI: https://doi.org/10.1007/BF00824271