METHOD AND DEVICE FOR MEASURING DISTANCES Russian patent published in 1995 - IPC

FIELD: hydroacoustics. SUBSTANCE: to reduce error of measuring the distances in water basins of limited sizes at presence of re-reflection and dispersive distortion, acoustic signal is received at two separated points, after which invariant speed is determined; then phase and group lag time is determined on the basis of measured parameters of received signals and distance is calculated according to algorithm obtained for periodic pulse radiated signal synchronized with time readings at point of reception. Device for realization of this method has following components carried on control object 1: first synchronizer 2, signal generator 3, multiplier 4, modulator 5, power amplifier 6 and acoustic radiator 7; object 8 being checked carries the following components: separated acoustic receivers 10 and 13, amplifiers 11 and 14, filters 12 and 15 connected with inputs of computer 18 controlled by second synchronizer 9 which operates in synchronism with first synchronizer 2. Connected with computer inputs are invariant speed setting unit 16 and time interval setting unit 17, indicator 19 being connected with its output. EFFECT: enhanced efficiency. 3 cl, 2 dwg