To solve the problem in which a pair of divers cannot be visible just a few meters away when transparency of the sea water is bad while diving and, in such a case, attention can be called by ringing a bell but sound transmission speed in the water differs that in the air, so that the human ear cannot recognize a sound generation direction and cannot determine the direction of the pair of divers.SOLUTION: Sound waves generated by a transmitter one of a pair of divers has are received by a receiver the other diver has, and the receiver indicates the direction of the transmitter cancels separation of the divers, so that they can safely dive and perform underwater work. As sound waves transmitted by the transmitter, sound waves having wavelength in the water whose intervals among a plurality of microphones of the receiver are over twice as wide are used.SELECTED DRAWING: Figure 1

    【課題】ダイビング中、海水の透視度が悪い場合など、数メートル離れただけでペアのダイバーを視認できなくなることがある。その際、ベルなどを鳴らして注意喚起を行うことは可能であるが、水中では空気中と音の伝わる速度が異なり、人間の耳では音の発生方向を認識しすることができず、ペアのダイバーの方向を判断することができない。【解決手段】ペアの一方のダイバーが持っている発信機の発する音波を、もう一方のダイバーが持つ受信機で受信し、受信機が発信機の方向を指示することにより、ダイバー同士のはぐれを解消し、安全にダイビングや水中作業を行うことができる。発信機が発信する音波は、受信機の複数のマイクの間隔の2倍を超える水中での波長を持った音波を使用する。【選択図】図1


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    Title :

    UNDERWATER DIRECTION INDICATION SYSTEM


    Additional title:

    水中方向指示システム


    Contributors:

    Publication date :

    2021-06-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01S RADIO DIRECTION-FINDING , Funkpeilung / B63C LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS , Zuwasserlassen, Trockenstellen, Docken oder Bergen von Schiffen / G01C Messen von Entfernungen, Höhen, Neigungen oder Richtungen , MEASURING DISTANCES, LEVELS OR BEARINGS



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