SONAR

PURPOSE:To prevent evil influence of internal noise of a sonar by making the acoustic velocity of a medium in the dome of the sonar, having a sound insulating plate for internal noise behind a signal detector faster than that of sea water. CONSTITUTION:In a dome 1, a signal detector 2 is installed a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	UCHIJIMA KENICHI, KOGA TAKASHIGE
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR ANALOGOUS ARRANGEMENTS USING OTHER WAVES DEAF-AID SETS DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MEASURING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PHYSICS PUBLIC ADDRESS SYSTEMS RADIO DIRECTION-FINDING RADIO NAVIGATION SOUND-PRODUCING DEVICES TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent evil influence of internal noise of a sonar by making the acoustic velocity of a medium in the dome of the sonar, having a sound insulating plate for internal noise behind a signal detector faster than that of sea water. CONSTITUTION:In a dome 1, a signal detector 2 is installed and a medium 6 is charged; and a sound insulating plate 4 for internal noise is fitted behind the signal detector 2. The medium 6 has a higher acoustic velocity than sea water as a medium 7 outside the dome 1. For this purpose, there are three kinds of method-using a medium having a higher acoustic medium, increasing the pressure of the medium, and raising the temperature of the medium. Consequently, the angle of refraction of the internal noise is increased and total reflection on the boundary surface of the medium is realized; and the quantity of a refracted and a diffracted wave entering the dome is reduced to reduce the influence of internal noise of a sonar.