APPARATUS FOR MONITORING VIBROACOUSTIC CHARACTERISTICS OF EXTENDED OBJECT Russian patent published in 2014 - IPC G01D5/353 G01H9/00 

FIELD: physics.

SUBSTANCE: apparatus for monitoring vibroacoustic characteristics of an extended object comprises a continuous semiconductor laser, an optical modulator designed to generate a periodic sequence of rectangular pulses with duration in the range of 50-500 ns and repetition frequency of 0.2-50 kHz, a sensitive element in form of a fibre-optic cable, a unit for inputting optical radiation into the sensitive element and outputting scattered radiation, a photodetector designed to convert scattered optical radiation into an electrical signal, and a signal processing unit with a processor, wherein the continuous semiconductor laser is equipped with a Bragg selective reflector capable of reducing the bandwidth of the continuous radiation of the laser to less than 100 kHz, and the optical modulator is in form of an acoustooptical modulator on a travelling acoustic wave, configured to generate a periodic sequence of rectangular pulses with extinction coefficient K≥10CHlg(TCHf), where T is pulse duration and f is repetition frequency.

EFFECT: longer range, higher sensitivity and resolution of the apparatus.

9 cl, 5 dwg