Sercel Inc.

Jérôme Laine

Jean-Paul Menard

Daniel Pennec

Jacques Hamon

Pierre Sagot

Christian Gregoire

Julien Baron

Hervé Delacourt

Jean-Pierre Houdusse

Nicolas Audonnet

The invention relates to a system for generating and collecting data with a view to determining the state of a structure (). The system comprises a system () for acquiring vibration signals and a communication gateway system (') configured to receive a signal (TL, TLrvl) from the gateway system (&#x2032;), using a first protocol, and when the signal (TLrvl) comprises a wake-up instruction, send the gateway system (&#x2032;) an activity instruction request signal (TW) using a second protocol, receive, from the gateway system (&#x2032;), using the second protocol, an activity instruction signal (TW) comprising an acquisition instruction, trigger a vibration signal acquisition operation and generate vibration data (Dvib) on the basis of the vibration signals acquired; and transmit, using the second protocol, the vibration data (Dvib) to the gateway system (&#x2032;). The invention also relates to the acquisition system and to the corresponding gateway system, and to a corresponding method.

System and method for generating and collecting vibration data with a view to monitoring a structure

A communication method is provided in a communication network, including a plurality of devices forming an ordered communication segment. At least one intermediate device of this segment is connected to at most two other devices called a previous device and a next device. The intermediate device receives data from the previous device and emits at least these data to the next device to propagate the data on the segment. A concentrator initializes transmission of a first frame of data through the segment to a terminal device ending the segment, which sends back a symbol initiating transmission of a second frame of data to the first concentrator through the segment. The method includes receiving a first symbol from the previous device, which triggers emitting a WAIT symbol to the previous device and emitting at least first symbol to the next device.

Communication method in a communication segment of a network

A digital seismic sensor adapted to be connected, via a two-conductor line, to an acquisition device. The digital seismic sensor includes: a digital sensor; a local sampling clock providing a sampling frequency; a receiver for receiving command data coming from the acquisition device and synchronization information providing accurate timing information to enable seismic sensor synchronization; a compensator for compensating, as a function of the synchronization information, a drift of the local sampling clock; a transmitter for transmitting seismic data towards the acquisition device; a driver for driving the receiver and the transmitter, according to a half-duplex transmission protocol over the two-conductor line and using a transmission clock extracted from the received command data; a power receiver for receiving electrical power; and a coupler for coupling the command and synchronization information receiver, the transmitter and the power receiver to the two-conductor line.

Digital seismic sensor and acquisition device adapted to be connected together via a two-conductor line

An acquisition device includes a pair of input terminals for connection to an analog seismic sensor generating a seismic signal. The device includes a detector for detecting a disconnection of the sensor, which includes a current source for injecting a low current in the sensor to generate an offset signal which depends on electrical resistance of the sensor and is added to the seismic signal. The offset signal encroaches on only a part of an operating range of the acquisition device. The voltage measured at the input terminals is applied to an analog-digital converter and a filter to obtain a measured value of the offset signal. A processing unit either analyzes a temporal variation of the measured value and triggers an alarm if a determined condition is satisfied, or transmits the measured value to a remote device adapted to analyze the temporal variation.

Acquisition device provided with means for detecting a disconnection of a set of at least one analog seismic sensor

The disclosure concerns a data acquisition apparatus and method. According to the disclosure,

Data acquisition apparatus and method

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.

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Sautron, France

Jérôme Laine