Abstract: The present invention relates to a method for manufacturing a membrane or wall (3) of a material, which is capable of vapour/vacuum deposition, over an opening of an object (2). The method includes: placing the opening with a defined rim against a backing surface (4) coated with a layer (5) repellent to the depositable material; depositing of the depositable material on the object (2) and the backing surface (4) to form an element; separation of the element from the hacking surface (4) leaving a membrane (3) integral with the element. The invention also relates to such an object provided with a membrane (3), and particularly an ultrasonic transducer (11) provided with a front membrane (3).

Abstract: The invention relates to a method for locating and destructing submarine vehicles from airborne vehicles disposed above the water surface, wherein a device (10) suspended from said airborne vehicle comprises sensing means (14) scanning generally in the horizontal plane to discover submarine vehicles in the water is submerged in the water from the airborne vehicle, said sensing means scanning the surrounding water to detect presence of and direction to submarine vehicles in the water. The device submerged in the water comprises a propulsion mechanism (12) and an explosive charge (11) and is released from the airborne vehicle during continuous scanning of the water and detection of the presence of an direction to submarine vehicles is propelled independently through the water and steered for the submarine vehicle from the point of release.

Abstract: The invention relates to a method and a system for sweeping marine mines having a magnetic sensor. According to the method spaced electrodes (10, 11, 13) are towed by a vessel (12) and the electrodes (10, 11, 13) are supplied with electric current from the vessel (12) so as to set up a magnetic field in the water surrounding the electrodes. At least three electrodes are utilized in the sweeping, and each electrode is supplied with electric current individually, the strength of which can be controlled. The system comprises a power source arranged on the vessel so as to generate current for the electrodes. The power source allows individually supply and control of the current to each of the electrodes.