Digital Array
The Digital Array (DA) is a modular high-speed real-time network system composed of a number of mono-, bi- or triaxial
seismographs connected in a high speed bus. An interface connecting to a PC or a complete SL06 recorder equipped with a GPS provides accurate synchronization to the bus and data recording and processing feature. Up to 8 nodes can be connected on the same branch. Several branches can work as data source over the standard TCP/IP bus and SeedLink
protocol.
The Digital Array solution can be assembled in various ways to meet the different requirements and applications of field work. The pictures show three different setups. One of the most challenging applications was the coaxial deployment of 6 triaxial units in a 285-meter borehole to monitor microseismic activity in a gas storage plant.
The Digital Array Master, shown in the picture, reads from the surface the data and is a single recording unit connected by a
mobile network modem. The use of a single cable, the orang reinforced cable in the picture, for power distribution, data, and synchronization ensures the quality of the recording.
Digitizing inside the capsule (or inside the node for surface devices) guarantees the highest data quality by avoiding all
crosstalk and electromagnetic interference. In this application, the housing of our SSBHV carrier was used, and three high-gain geophones recorded the signal.
Mechanical coupling was guaranteed by the leaf spring, and the wall locking was accomplished by a passive sawtooth clamping mechanism on the bottom of each capsule. The use of coaxial sensors in the borehole allows for higher resolution and detection capabilities when detecting microseismic activity. The SL06 Digital Array master unit contains
all the functions of a seismic recorder and can be directly connected to any seismic recording software, such as SEISMOWIN.
| Brands | Sara Electronic instruments |
|---|---|
| Number of channel | 24 bit (ΣΔ) + 3 (12 bit low data rate for static measurement). |
| Type of sensor | Velocitimeter, FBA, MEMS, Tiltmeteter, other |
| Sampling | Simultaneous for the three channels (1 a/d per ch), synchronized between nodes. |
| Dynamic range | > 140dB @ 100SPS in the range of 0.1 – 10Hz |
| Ral time clock | +/- 10 ppm (-20 / +50 °C) |
| Protection grade | IP68 |
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