Sercel Inc.

Jean-Paul Menard

Maurice Moreau

Jérôme Laine

Daniel Pennec

Mathieu Sanche

Pierre Sagot

Jacques Hamon

Sylvie Menezo

Jean-Luc Dronet

Hubert Dieulangard

Dominique Deniau

Laurent Guerineau

The invention relates to a device, a method and an apparatus for acquiring data, the device comprising a wireless network including a set of nodes (), each node () including a sender () and a receiver () for sending and/or receiving and/or relaying data and/or commands, and a satellite positioning system (), characterized in that each satellite positioning system () includes means for providing specific data used for time-stamping the data relative to a common time reference, organizing an access to the wireless network in a perfectly controlled manner, and routing data and/or commands within the network.

Wireless data acquisition network

A data acquisition network includes an assembly of nodes including at least one wireless network of nodes in which two neighboring nodes transmit data between each other by radio waves. The assembly of nodes also includes at least one other network of nodes in which two neighboring nodes transmit data between each other by a cable. The data is also conveyed by radio waves. The at least one other network forms a cabled network of nodes.

Mixed wireless and cabled data acquisition network

The invention relates to an accelerometer comprising a moving mass () and a fixed part (), which uses variations in capacitance () in order to detect the movement of the mass (). The inventive accelerometer comprises a first series of electrodes () which are solidly connected to the mass () and which are interdigitated with a series of electrodes () which are solidly connected to the fixed part (). According to the invention, each moving electrode (), together with an adjacent fixed electrode (), forms a capacitance which varies according to the position of the moving mass (). The accelerometer further comprises an electronic circuit which is used to detect the variation in at least one capacitance between the moving mass () and the fixed part (), in the form of a moving mass displacement indicator. The invention is characterised in that one or more or the electrodes () or the moving mass () and/or the fixed part () takes the form of a finger with a large base and a profile which narrows in the direction of the free end thereof. Moreover, the recurring return stress can be selected such that the mechanical power has an essentially zero power zone at the mechanical resonance frequency of the electrodes.

Accelerometer with reduced extraneous vibrations owing to improved electrode shape

The invention relates to a fiber-optic seismic sensor () with a test body (), characterized in that the test body () comprises several separate dishes () that are distributed around the direction of the sensitive axis of the sensor and two star-shaped elements () placed on either side of the dishes () and mechanically linking said dishes () together.

Fiber-optic seismic sensor

An accelerometer uses variations in capacitance to detect and measure the movement of a moving mass in relation to a fixed part. The accelerometer comprises a first series of electrodes, which are solidly connected to the mass and which are interdigitated with a second series of electrodes. The second series of electrodes are solidly connected to the fixed part. The accelerometer further comprises an electronic circuit which: detects the variation in at least one capacitance between the moving mass and the fixed part, in the form of a moving mass displacement indicator; and also generates an electrostatic stress in order to return the moving mass to the initial position thereof.

Accelerometer with reduced extraneous vibrations owing to improved return movement

The invention relates to an apparatus and a method for data acquisition, the apparatus being characterized in that it comprises an analog/digital converter () sampling at an imperfect frequency Fprovided by a local clock () data acquired by a sensor () thus providing a series of sampled and dated data E[k], a time-stamping module () for measuring the frequency error of the local clock () by determining the sampling dates according to a universal time UTC(t), and a resampling module () for correcting the sampled and dated data E[k].

Apparatus and method for compensating the drift of a local clock used as sampling frequency

A seismic data acquisition system includes a plurality of sensors which are arranged so they can be used to measure translation movements of a medium with three independent spatial components and of the rotation movements around each of the three independent spatial components, thus forming a six-component system.

Six-component seismic data acquisition system

A module is described for acquiring geophysical signals. The module includes at least one casing which is individually linked to one track. Each casing houses a processor which operates to digitize the geophysical signals. The module further includes two cable sections associated with each casing. Each cable section includes at a first end, a connector suitable for being coupled up to a complementary connector, and at a second end, an adapted configured to be fixed to a casing and to effect an electrical link with the processor housed in the casing.

System for acquiring geophysical data

A slave mobile plate accelerometer using variations of capacitance to detect the movement of a mass. The apparatus comprises at least one pair of fixed electrodes rigidly attached to an armature, and at least one mobile electrode suspended by springs from the armature, between the two fixed electrodes of each pair of fixed electrodes, to form two capacitors, each mobile electrode being adapted to move between the fixed electrodes of each pair of fixed electrodes, due to the effect of acceleration, so causing a variation of the capacitance of each capacitor. The accelerometer further includes an electronic circuit for adjusting the electrostatic stiffness of at least one combination of a fixed electrode and a mobile electrode and a control system for detecting the variation of the capacitance of each capacitor.

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Pornic, France

Jean-Paul Menard