Data Acquisition Units
IMS’s netADC is a 24-bit, 4- or 8-channel, low noise Analogue-to-Digital Converter (ADC) with Ethernet interface. It continuously digitizes and timestamps analogue signals from a wide range of seismic sensors, sending the digital data over Ethernet using IMS’s low latency Waveforms Over Ethernet protocol.
netADC key features:
- Small, lightweight, 35mm DIN-rail mountable enclosure
- 4 or 8 balanced, differential analogue input channels
- Low power: 0.6 W/channel
- Geophone, broadband, force balance or IEPE (piezoelectric) digitizer interface
- Wide dynamic range: 147 dB @ 50 sps
- Low noise: below New Low Noise Model (see accompanying plot)
- Configurable sampling rates: 3 – 192,000 sps (unlimited decimation with external processor)
- Standard, fully compliant, 10/100/1000BASE-TX (IEEE 802.3) Ethernet interface
- Power over Ethernet (PoE) capable
- Timing, power and data over single cat5 cable (if using IMS WoE switch)
- Sensor state-of-health coil measurements
- Compatible with Smart seismic sensors (self-configuring)
- Sensor calibration and control functions
For further details, please refer to the IMS netADC specifications document.
netSP (network Seismological Processor) is an embedded computer with integrated 4 port Ethernet switch, status indication LEDs and user input buttons. The embedded computer is used to run data acquisition software which performs tasks such as data capture from netADC, triggering, pre-trigger filtering, buffering and data transfer to seismic server.
The embedded computer is chosen to meet the specific requirements of the application, e.g. specialised computationally intensive signal processing tasks such as adaptive spectral triggering require a more powerful CPU, whereas standard triggering/buffering tasks are runnable on lower end, cheaper and power efficient processors.
The integrated 4-port switch of netSP is unique in that it distributes the timing signal (ATU) required by netADCs over the same cat5 cable used for data transfer. This eliminates the need for running separate communication lines for timing between netADCs and the central timing source.
For further details, please refer to the IMS netSP specifications document.