Abstract
Une structure de plaque d'embase et d'enceinte rigide, legere, pour un transducteur sismique. A base plate structure and a rigid enclosure, light for a seismic transducer. La plaque d'embase (12) comprend un moyeu central (26) de reception d'une bielle de piston inferieure (70). The base plate (12) comprises a central hub (26) for receiving a lower piston rod (70). Des plaques superieure et inferieure (32 et 36) s'etendent radialement a l'exterieur a partir du moyen central (26). The upper and lower plates (32 and 36) extend radially from the outside of the central means (26). Une pluralite de plaques de renforcement egalement espacees angulairement (40) s'etendent egalement radialement vers l'exterieur a partir du moyeu (26), leurs bords superieurs et inferieurs etant relies aux plaques superieure et inferieure. A plurality of reinforcement plates also spaced angularly (40) also extend radially outwards from the hub (26), upper and low edges being subsequently assembled in the upper and lower plates. Un ensemble d'enceintes (78) relie rigidement une bielle de piston superieure (74) a la plaque d'embase (12), et comprend une section tronconique (82). A set of speakers (78) rigidly connects an upper piston rod (74) to the base plate (12), and includes a frustoconical section (82). La structure formee de l'enceinte rigide legere (78) et de la plaque d'embase (12) constitue un transducteur sismique ayant une distribution de force en phase sur sensiblement toute la region de la plaque d'embase lorsqu'elle est en contact avec le sol. The structure formed of the rigid enclosure slight (78) and the base plate (12) is a seismic transducer having in-phase force distribution over substantially the entire area of the base plate when in contact with the ground.
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