Abstract: Device for the representation, in a frequency-wave number reference frame f-k, of the propagation of an ultrasound wave in a dihedral guide (1), which comprises ultrasound emitters (2) referenced by “Ej” with j an integer varying between 1 and N, N a strictly positive integer and ultrasound receivers (3) referenced by “Ri” with i an integer varying between 1 and M, M a strictly positive integer, the receivers being disposed spatially over a first segment of a straight line according to a regular pitch “A”, which comprises means for processing the signal received by the receivers, originating from the emitters, and in which the processing means comprise means for calculating a modified discrete spatial Fourier transform, for a spatial integration variable “x”, centered in the middle of said first segment and running through the receivers in the direction of increasing x, and for a wave vector k(x) equal to a product k.

Abstract: Device for the representation, in a frequency-wave number reference frame f-k, of the propagation of an ultrasound wave in a dihedral guide (1), which comprises ultrasound emitters (2) referenced by “Ej” with j an integer varying between 1 and N, N a strictly positive integer and ultrasound receivers (3) referenced by “Ri” with i an integer varying between 1 and M, M a strictly positive integer, the receivers being disposed spatially over a first segment of a straight line according to a regular pitch “A”, which comprises means for processing the signal received by the receivers, originating from the emitters, and in which the processing means comprise means for calculating a modified discrete spatial Fourier transform, for a spatial integration variable “x”, centered in the middle of said first segment and running through the receivers in the direction of increasing x, and for a wave vector k(x) equal to a product k.

Abstract: A system for separating a bottom plastic card includes a loading roller, on which a first end of the bottom plastic card rests, having a groove extending parallel to the axis of said loading roller. A movable assembly is disposed above the loading roller and includes a base and a loading wheel free to rotate. The base is moveable vertically between a contact position and a separated position. A return means constrains the movable assembly in the contact position. The base has an upstream wall upstream of the loading wheel and the bottom end of which is, in the contact position, at a distance from the loading roller less than the thickness of the bottom plastic card. The groove has an opening and a depth sufficient to enable the bottom plastic card's first end to descend in the groove so its first end passes under the upstream wall's bottom end.

Abstract: A card loader is intended to be fixed to a printer (23), the loader comprising at least one loading device intended to receive at least one card to be printed, and at least one driving device (16; 19). Each driving device (16; 19) makes it possible to transfer cards to be printed from a loading device to the printer (23). At least one driving device (16; 19) is movable to enable the printer (23), or a said loading device, to use, in order to manipulate a card, a space that is occupied by said driving device(s) (16; 19) when said driving device(s) (16; 19) transfer(s) a card to be printed to the printer.