ACOUSTIC ACTIVE SONAR Russian patent published in 2003 - IPC

FIELD: acoustic location systems designed to detect objects positioned in acoustically clear media and to classify these objects according to their stiffness. SUBSTANCE: preferable application fields of this invention lie in ultrasonic flaw detection, underwater acoustics, geoacoustics, medical diagnostics, fish location. Acoustic active sonar incorporates synchronizer 1, indicator 14, radio pulse generator 2, frequency divider 5, commutator 6, acoustic converter 7, first amplifier-limiter 8, phase detector 13, frequency multiplier 11, second amplifier-limiter 12, generator 3, amplitude modulator 4, amplitude detector 9 and phase inverter 10. EFFECT: raised authenticity of classification of objects by acoustic stiffness, enhanced resolution and diminished skip zone. 4 dwg