The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2007
Filed:
May. 01, 2006
Robert E. Rouquette, Kenner, LA (US);
Robert E. Rouquette, Kenner, LA (US);
Input/Output, Stafford, TX (US);
Abstract
Apparatus and methods for reducing ghosts from hydrophone signals in a streamer towed underwater close to the sea surface. A multi-axis micro-electro-mechanical-system (MEMS) accelerometer with attitude sensing is used to reduce the frequency spectral notch in the response of the combined hydrophone-accelerometer system and to reduce the sensitivity to ghost-producing downward traveling acoustic waves that are sea-surface reflections of the primary upward traveling acoustic waves. Multi-axis spring load cells provide high compliance and mechanical isolation between stress members and the accelerometer system. The load cells also provide signals representing the vibration of the stress members. The signals can be used with an adaptive filter estimating the mechanical transfer function between the vibration and the motion of the accelerometer system to remove the vibration-induced noise from the accelerometer signals.