*********** 062593A.OAC *********** Contributory Categories: ENG, GEO, PHY Country: Japan From: ONR Asia Assignment Report KEYWORDS: Japan, Acoustics, Echo sounders, Technology Transducers +++++ Third in a four part message from the ONR Asia Assignment Report: LOW FREQUENCY TRANSDUCERS AND UNDERWATER ACOUSTIC TECHNOLOGY IN JAPAN by Prof. TOKUO YAMAMOTO of the University of Miami, who spent 3 months in Japan visiting various facilities. The report shows the value of having a Japanese speaker like Prof. Yamamoto undertake such a task as many of the references cited are in Japanese and of course Prof. Yamamoto can ask questions of the scientists and engineers, during his visits, in their native tongue. Unfortunately, the figures can not be transmitted, however the figure captions are given at the end of each section. The four parts include: Part I: (already sent) TABLE OF CONTENTS EXECUTIVE SUMMARY INTRODUCTION Part II: (already sent) UNDERWATER ACOUSTIC RESEARCH AND DEVELOPMENT I. LOW FREQUENCY UNDERWATER ACOUSTIC TRANSDUCERS DEVELOPED IN JAPAN SUMMARY A. SUPER MAGNETOSTRICTIVE ALLOY PULSATING BARREL TYPE PROJECTORS B. REEL TYPE RESONATORS C. DUAL CYLINDER LOW FREQUENCY TRANSDUCER D. DUAL DISK BENDER LOW FREQUENCY PROJECTORS OPERATING IN UNSTIFFENED MODE Part III: (THIS MESSAGE) E. DUAL DISK BENDER LOW FREQUENCY PROJECTORS OPERATING IN STIFFENED MODE F. LOW-FREQUENCY FLEXTENSIONAL TRANSDUCER WITH DISPLACEMENT AMPLIFIER. G. DEEP WATER FLEXTENSIONAL TRANSDUCERS H. ORGAN PIPE TYPE RESONATORS 1. HYDRAULIC SERVO-FEEDBACK TYPE ACOUSTIC PROJECTORS J. PARAMETRIC ARRAY SOURCE Part IV: II. UNDERWATER ACOUSTIC TECHNOLOGY DEVELOPED IN JAPAN SUMMARY A. UNDERWATER ACOUSTIC VISION SONAR. B. ACOUSTIC DOPPLER PROFILER SYSTEM C. ACOUSTIC CURRENT METERS D. UNDERWATER VOCAL COMMUNICATION SONAR E. UNDERWATER ACOUSTIC DIGITAL COMMUNICATION SONAR F. DEEP WATER POSITIONING SYSTEM G. MULTI-NARROW BEAM ECHO SOUNDER H. 360 DEGREE SCANNING SONAR ************** END Msg. A.OAC **************