Abstract:
A supporting system for carrying apparatuses to be moved under water at a substantially constant submersion depth, when towed from a ship, including a platform made up of two elongate members interconnected through plates carrying the apparatuses, a depth regulating paddle foil or flap, automatically controlled by the variation of the hydrostatic pressure, and a float secured to the platform, through cross members, at a certain distance above the platform.
Abstract:
A device for generating acoustic waves in the earth by striking a mass, housed in a guiding tube, against a target member secured to the lower end of this tube and coupled to the earth in operating conditions, including means, such as an electromagnet, for holding said mass at the upper end of said tube and releasing it at will, and means to turn the tube upside down after each operation so as to reset the mass in position for a new operation.
Abstract:
A device for generating in the ground longitudinal and transverse acoustic waves by a mass striking a target element coupled with the surface of the ground. The target element is recessed in a central part thereof and have an inner wall slanted with respect to the vertical in the form of, for example, a truncated cone. The mass is fixed to the end of an arm pivoting with respect to a support structure in the form of a parallelepipedic cage, which is movable by a cylinder between a high transport position and a low position in which the target element is coupled with the ground a drive causes raising of the mass by pivoting the arm with the geometry of the assembly being calculated so that the mass strikes the inner slanting faces perpendicularly thereto, and thus creates both P and S waves.
Abstract:
A device for transmitting acoustic waves through a liquid medium in which it is submerged comprising two movable assemblies including respectively members provided with first contact walls and delimiting with a sealing membrane a water tight enclosure, and members provided with second contact walls which are the armatures of an electro-magnet, the respective members being so arranged that when the first contact walls are in contact, the second contact walls are spaced apart and conversely, pressure actuated means for moving the first contact walls apart from each other and releasable locking means including an energizing coil for maintaining the armatures of the electro-magnet in spaced apart relationship.
Abstract:
A submerged device, carrying oceanography apparatuses, is adapted to be towed from a ship and provided with an automatic control of the submersion depth, which is made up of two hulls of positive buoyancy and interconnecting cross members with the device having a center of bouyancy substantially above the center of gravity, and at least one movable substantially airfoil shaped fin, which is actuated by the automatic control of the submersion depth which is sensitive to the depth of submersion of the device.
Abstract:
This device comprises two movable elements of rigid material tightly interconnected by means of a deformable membrane forming therewith a tight internal enclosure, means for varying abruptly the volume of said enclosure by successively moving the two elements away from each other, maintaining them in spaced relationship and allowing them to be urged toward each other by the effect of the external hydrostatic pressure, in which the means for moving the two elements away from each other includes two cylinders and at least one piston slidable in one of said cylinders, associated to one of said movable elements and also to a push-member slidable in one of the cylinders and bearing on the other movable element and means for feeding said cylinder with pressurized fluid so as to maintain the elements in spaced relationship or to release them.
Abstract:
This device comprises two movable elements of rigid material tightly interconnected by means of a deformable membrane forming therewith a tight internal enclosure, means for varying abruptly the volume of said enclosure by successively moving the two elements away from each other, maintaining them in spaced relationship and allowing them to be urged toward each other by the effect of the external hydrostatic pressure, in which the means for moving the two elements away from each other includes two cylinders and at least one piston slidable in one of said cylinders, associated to one of said movable elements and also to a push-member slidable in one of the cylinders and bearing on the other movable element and means for feeding said cylinder with pressurized fluid so as to maintain the elements in spaced relationship or to release them.
Abstract:
The improved device for generating acoustic shear waves in the earth comprises a target member adapted to be coupled with the earth and provided with two lateral striking surfaces on which impinges a hammer pivotably mounted on a platform; the target member is connected through damping means to a cage supporting the platform, the hammer and its actuation means, said cage being displaceable with respect to the frame of a carrying vehicle between a position of contact with the earth of the target member and a lifted position thereof, the striking surfaces being inner walls of the target member.
Abstract:
The device includes two movable members interconnected at their periphery by a flexible membrane defining therewith a tight enclosure of variable volume, a piston slidable in a cylinder integral with one of the two movable members and hydraulically actuated, to move the members apart from each other, a second cylinder separated in two compartments by an inner valve and controlling the actuation of the piston in response to the pressure of the water feeding said second cylinder, two apertures intermittently freed by the valve for releasing the piston and at least one aperture for the discharge of the water from the tight enclosure to the external water body when the piston release allows the two movable members to be urged toward each other, thereby producing an implosion which generates a strong sonic wave.
Abstract:
A method and apparatus for determining the position of a plurality of seismic echo receivers on a towed cable by interpolating values obtained by measuring, by means of at least one device positioned among said receivers, the angle between the tangent to the cable and a fixed and known direction. The measuring device can also include apparatus for measuring its depth and its distance from a generator of seismic waves. This provides for more effective use of processes which involve the addition of seismic traces in marine seismic prospecting.