Method for measuring the water thickness above a bottom cable

Details Method for measuring the water thickness above a bottom cable Method for measuring the water thickness above a bottom cable

G - Physics

01

V

G01V 1/30 (2006.01) G01V 1/28 (2006.01) G01V 1/38 (2006.01)

Patent

CA 2205426

Dual-mode seismic sensors are used to detect the velocity signature and the pressure signature of a reflected acoustic wavefield. The velocity and pressure signatures are resolved into up-going and down-going wavetrains which may be transformed from the time domain to the frequency domain. The transforms are cross-correlated. The time delay that maximizes the zero-lag cross-correlation function is the two-way water-layer travel time.

Les capteurs sismiques bimodes servent à détecter la signature de vitesse et la signature de pression d'un champ d'ondes acoustiques réfléchies. Les signatures de vitesse et de pression sont déterminées en trains d'onde ascendants et descendants qui peuvent être transformés du domaine temporel au domaine des fréquences. Les transformées sont mises en corrélation croisée. Le délai temporel qui maximise la fonction de corrélation croisée à déphasage zéro est la durée de déplacement dans les deux sens dans la couche d'eau.

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