Optical heterodyne arrangement with a two-frequency radiation source for mechanical vibration measurements

Conclusions An experimental model of an optical heterodyne arrangement has been developed and fabricated for the measurement of mechanical vibrations having a complicated form. The metrological characteristics of the arrangement were determined experimentally. The relative measuring error for the velocity of harmonic vibrations over the range from 0.2 to 20 mm/sec, referred to the upper limit, is 1.2%. The arrangement can reproduce an analog of mechanical vibrations having a complicated form with a dynamic error of no more than 4%.Translated from Izmeritel'naya Tekhnika, No. 9, pp. 39–41, September, 1973.