Abstract: The invention relates to a system for generating and collecting data with a view to determining the state of a structure (100). The system comprises a system (1) for acquiring vibration signals and a communication gateway system (2, 2?) configured to receive a signal (TL21, TL21rvl) from the gateway system (2, 2?), using a first protocol, and when the signal (TL21rvl) comprises a wake-up instruction, send the gateway system (2, 2?) an activity instruction request signal (TW12) using a second protocol, receive, from the gateway system (2, 2?), using the second protocol, an activity instruction signal (TW21) 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 (2, 2?). The invention also relates to the acquisition system and to the corresponding gateway system, and to a corresponding method.

Abstract: The invention relates to a system for generating and collecting data with a view to determining the state of a structure (100). The system comprises a system (1) for acquiring vibration signals and a communication gateway system (2, 2?) configured to receive a signal (TL21, TL21rvl) from the gateway system (2, 2?), using a first protocol, and when the signal (TL21rvl) comprises a wake-up instruction, send the gateway system (2, 2?) an activity instruction request signal (TW12) using a second protocol, receive, from the gateway system (2, 2?), using the second protocol, an activity instruction signal (TW21) 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 (2, 2?). The invention also relates to the acquisition system and to the corresponding gateway system, and to a corresponding method.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A seismic node, in a seismic data acquisition system, includes a housing having an input receiving analog seismic data and an output supplying corrected series of digital sampled and dated seismic data; a single local clock located inside the housing and configured to generate an inaccurate local clock signal (CLK); a gauging circuit configured to measure a frequency drift and a phase error of the local clock signal (CLK) based on received synchronization information; an analog-to-digital converter located inside the housing and configured to process the analog seismic signal based on the local clock signal (CLK) and to provide a series of digital sampled and dated seismic data; and a correcting circuit for generating the corrected series of digital sampled and dated seismic data based at least on the measured frequency drift and phase error of the local clock signal (CLK).

Abstract: A seismic data acquisition apparatus includes a receiving antenna for receiving synchronization information representative of a remote reference clock signal; a local clock circuit delivering a local clock signal (CLK); a gauging circuit adapted to measure a frequency drift and a phase error of the local clock signal (CLK) in view of the synchronization information; an analog-to-digital converter adapted to provide a series of digital sampled and dated seismic data according to the local clock signal (CLK) and representative of the received seismic signal; and a correcting circuit configured to provide corrected series of digital sampled and dated seismic data based at least on the measured frequency drift and phase error.

Abstract: 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.

Abstract: 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.

Abstract: 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 analyse the temporal variation.

Abstract: 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.

Abstract: The disclosure concerns a data acquisition apparatus and method. According to the disclosure, a first means providing a series of first digital sampled data (X) at an imperfect sampling frequency (FE) provided by a local clock (2) comprises sigma-delta modulation means (3) arranged to produce said series of first digital sigma-delta modulated data (X), a second gauging means (50) for measuring the frequency error of the local clock (2) in view of a reference clock (6), a third means for correcting the first data based at least on the measured frequency error, which comprises at least an interpolation means (4) to produce second digital data (Y) based on at least an interpolation of said first series (X) and compensating the measured frequency error (FD), and at least a decimation filter (7) for producing third digital data (A) based on said second digital data (Y), are provided.

Abstract: The disclosure concerns a data acquisition apparatus and method. According to the disclosure, a first means providing a series of first digital sampled data (X) at an imperfect sampling frequency (FE) provided by a local clock (2) comprises sigma-delta modulation means (3) arranged to produce said series of first digital sigma-delta modulated data (X), a second gauging means (50) for measuring the frequency error of the local clock (2) in view of a reference clock (6), a third means for correcting the first data based at least on the measured frequency error, which comprises at least an interpolation means (4) to produce second digital data (Y) based on at least an interpolation of said first series (X) and compensating the measured frequency error (FD), and at least a decimation filter (7) for producing third digital data (A) based on said second digital data (Y), are provided.

Abstract: The invention relates to an apparatus and a method for data acquisition, the apparatus being characterized in that it comprises an analog/digital converter (510) sampling at an imperfect frequency FE provided by a local clock (100) data acquired by a sensor (500) thus providing a series of sampled and dated data E[k], a time-stamping module (300) for measuring the frequency error of the local clock (100) by determining the sampling dates according to a universal time UTC(t), and a resampling module (400) for correcting the sampled and dated data E[k].

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to an apparatus and a method for data acquisition, the apparatus being characterized in that it comprises an analog/digital converter (510) sampling at an imperfect frequency FE provided by a local clock (100) data acquired by a sensor (500) thus providing a series of sampled and dated data E[k], a time-stamping module (300) for measuring the frequency error of the local clock (100) by determining the sampling dates according to a universal time UTC(t), and a resampling module (400) for correcting the sampled and dated data E[k].