Sercel Inc.

John S Hepp

Mike Maples

Gaetan Mellier

Simon Leboeuf

Isabelle Sellin

James Spackman

Gaëtan Mellier

A section of a streamer for acoustic marine data collection, the section having a carrier for accommodating seismic sensors, wherein the carrier includes, a single body, a first particle motion sensor located on the single body, and a second particle motion sensor being located on the single body, with a 90&#xb0; angular offset, about a longitudinal axis of the carrier, relative to the first particle motion sensor; and a tilt sensor coupled to the carrier and having a known direction relative to the first and second particle motion sensors so that the tilt sensor determines an angle of tilt of the carrier about a vertical. The first and second particle motion sensors measure a motion related parameter and not a pressure.

Dual axis geophones for pressure/velocity sensing streamers forming a triple component streamer

A section of a streamer for acoustic marine data collection, the section comprising a carrier for accommodating seismic sensors, wherein the carrier includes, a single body, a first particle motion sensor located on the single body, and a second particle motion sensor being located on the single body, with a 90&#xb0; angular offset, about a longitudinal axis of the carrier, relative to the first particle motion sensor; and a tilt sensor coupled to the carrier and having a known direction relative to the first and second particle motion sensors so that the tilt sensor determines an angle of tilt of the carrier about a vertical, wherein the first and second particle motion sensors measure a motion related parameter and not a pressure.

A seismic streamer includes a sensor comprises an axially oriented body including a plurality of axially oriented channels arranged in opposing pairs; a plurality of hydrophones arranged in opposing pairs in the channels; a pair of orthogonally oriented acoustic particle motion sensors; and a tilt sensor adjacent or associated with the particle motion sensors. The streamer has a plurality of hydrophones, as previously described, aligned with a plurality of accelerometers which detect movement of the streamer in the horizontal and vertical directions, all coupled with a tilt sensor, so that the marine seismic system can detect whether a detected seismic signal is a reflection from a geologic structure beneath the streamer or a downward traveling reflection from the air/seawater interface.

There is a testing device for testing a sensor. The testing device includes a rotating mechanism; a first rotating plate connected to the rotating mechanism so that the first rotating plate rotates around an orbital axis (Z); a second plate rotatably attached to the first rotating plate at a rotating point, the second plate having a rotational axis (Z) offset from the orbital axis (Z) by a predetermined distance R; and a gripping mechanism attached to the second plate and configured to receive and fix the sensor relative to the second plate. The second plate follows a circular trajectory with constant attitude around the orbital axis (Z).

Method and apparatus for testing a sensor

A method for electrically setting a gap for a piezoelectric pressure sensor. The method includes positioning a piezoelectric flex element on a tray; attaching a voltage source to the piezoelectric flex element of a piezoelectric pressure sensor; applying a voltage from the voltage source to the piezoelectric flex element; curing an adhesive between the piezoelectric flex element and the tray while the piezoelectric flex element is deflected by the voltage; and stopping the voltage from the voltage source to the piezoelectric flex element when the adhesive has been cured.

Method and apparatus for electrical gap setting for a piezoelectric pressure sensor

A streamer for seismic prospection comprising directional sensors (), such as geophones or accelerometers, distributed along the streamer, characterized in that said streamer comprises at least two tilt sensors () located in remote positions and in locations distant from the directional sensors () and means which determined the effective orientation of each directional sensor () by interpolating along the streamer the tilt detected by the two tilt sensors ().

Streamer for seismic prospection comprising tilt compensation of directional sensors

A communication housing for devices external to a solid marine seismic cable, especially for level control devices, comprises an upper housing half and a lower housing half, coupled together around the cable. The upper housing half includes a plurality of wells, for example three wells, each adapted to receive a communication coil. The lower housing half has no such wells. The communication coils are wound in series to reinforce the signal strength of the communication signal. The communication coils are preferably formed to two segments, joined together at a flexible joint to reduce the likelihood of breakage of the coil core as the cable is wound onto a take up reel aboard the exploration vessel.

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Leander, TX, United States of America

John S Hepp