Apparatus for the measurement of gravitational gradients

Details Apparatus for the measurement of gravitational gradients Apparatus for the measurement of gravitational gradients

G - Physics

01

V

G01V 7/00 (2006.01)

Patent

CA 2465994

An apparatus for the measurement of quasi-static gravity gradients, comprising: a flexible string (1); and output means for producing an output which is a function of said gravity gradients; and wherein the string is fixed (2, 2') at both ends; and wherein the apparatus comprises sensing means (L1, L2) for detecting the transverse displacements of said string from its undisturbed reference position due to a gravity gradient around said string; and the output means are responsive to the detected displacement to produce said output which is a function of the gravity gradient; the apparatus further comprising means (30) mounted at a position corresponding to the mid-point between the fixed ends of the string and constructed to prevent movements of said string which correspond to all its odd modes (starting from C-mode) whilst not affecting at least the movement of said string which corresponds to its second fundamental mode (S-mode).

L'invention concerne un appareil de mesure de gradients gravitationnels quasi-statiques. Ledit appareil comprend notamment une tige flexible (1) et des moyens de sortie permettant de produire une sortie qui est fonction desdits gradients gravitationnels. La tige est fixée aux deux extrémités (2, 2'). Ledit appareil comprend des détecteurs (L1,L2) permettant de détecter les déplacements transversaux de ladite tige à partir de sa position de référence non modifiée, dus à un gradient gravitationnel autour de ladite tige. Les moyens de sortie réagissent au déplacement détecté pour produire ladite sortie qui est fonction du gradient gravitationnel. Ledit appareil comprend également des éléments (30) montés en une position correspondant au point médian entre les extrémités de fixation de la tige. Lesdits éléments (30) sont conçus pour éviter les mouvements de ladite tige correspondant à tous ses modes particuliers (commençant par le mode C) sans pour autant affecter au moins le mouvement de ladite tige qui correspond à son second mode fondamental (mode S).

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