Accelerographs
Accelerographs Overview
GEObit provides a flexible, real-time, immediate warning, structural monitoring solution. We combine our GEOThree digitizer/recorders and a very powerful processing unit to provide a real-time structural monitoring and alert system.
The GEObit advanced, multi-channel, structural monitoring system supports real-time, automatic user alerts. The system acquires data from all channels at 200 SPS per channel by default, continuously processing in real time. The vibration level is calculated in the DIN4150 format. If the level exceeds the standard limit, the user receives an alert by SMS and email.
+ Additional Details
The multi-channel system has been used in several applications requiring a real-time vibration monitoring system. Applications include blast monitoring, structure vibration monitoring caused by nearby work or construction projects, and monitoring of ancient buildings for human-sourced vibrations.
The communication and analysis software (GEOShock) runs on a Linux PC with the following features: signal waveform plot, FFT analysis, spectrum response, energy content per frequency, file conversion in ASCII format, individual trigger level set for each sensor, alert via email or SMS when SPPV exceeds predefined limits, etc. The software can be installed on any computer, and the user can receive data in real time, processed at multiple receiving points. The software includes the data plot software “SeisGram2k” and the SPPV monitor.
The software's implementation has been developed to provide continuous monitoring and recording of the vibrations in real time, calculating parallel vibration every minute and determining how many times the SPPV limit has been exceeded. The SPPV limit is not constant but linear to the frequency from 10 to 100 Hz and can be derived from the structural study of the building.
The software can send automated email notifications to the user if limits are exceeded.
The SPPV velocity calculation is automatically performed by the monitoring service program GEOShock. It processes the data in real time, calculates the SPPV magnitude, and displays it in a plot as a function of frequency. It also plots the maximum SPPV value calculated every minute. If the SPPV threshold is exceeded, the user receives an email alert containing the maximum value exceeding the threshold.
+ Features
- Multi-channel systems (up to 1000 recording channels) with parallel data recording at the central recording unit
- Parallel data processing
- Usage of 32-bit ADC digitizer units
- Extremely low power consumption, only 0.2 W per channel
- Real-time telemetry over SeedLink protocol & system control
- Selection variety of analog sensors (BB seismometer, short period seismometer, geophone force balance, high-frequency geophone, deep borehole geophone, water pressure hydrophone, seismic accelerometer, strong motion accelerometer, MEMS accelerometer)
- Real-time data processing module using the DIN4150 format
- Real-time user alert
GEO-A200 Compact Digital Accelerograph
Overview
GEObit introduces GEO-A200 high-resolution and high dynamic range compact digital accelerograph. The instrument is only 139mm in height and 138mm in diameter. The power consumption is less than 2W. The available sampling rate is 1 to 1000sps, and optional lower sampling rates are supported. The built-in GNSS receiver combined with ultra-accurate DPLL unit providing time drift 10e-9sec ensures timing stability even without a GPS signal. NTP timing is also available. The instrument provides self-calibration functionality. DC offset removal is also performed automatically or on demand. Acquisition parameters and operation modes can be set from the user-friendly web interface, which can be protected with up to 64 character passwords.
+ Additional Details
The unit operates in continuous mode, triggered mode, or both, and data are streamed through different data ports. Local data storage and log file information are selectable. The unit supports advanced functionality, implemented using a combination of trusted open source software components. Because of open source architecture, it can run any custom application, thus providing the next-day solution to the user. The hardware is based on an embedded ARM9 400MHz ARM Linux board running a 14.6 Linux kernel. The data are stored in mini-SEED format on the microSD card or a removable USB stick. The instrument supports 10/100 ethernet port and debug port. FTP, SFTP, and SSH are also available. The state of health is transmitted over UDP packets upon request.
The instrument supports embedded earthworm and seedlink server with a configurable data packet size that allows data transmission with low latency. The instrument is ideal for earthquake monitoring and early warning and structural monitoring applications. Single bolt mounting and flexibility of connectivity allow easy and quick installation.
+ Features
- FBA-based compact digital accelerograph
- Cost effective and high performance
- Bandwidth DC-200Hz
- Dynamic range >155dB
- Ethernet - WiFi - Serial port
- 32bit ADC digitizer
- GNSS time/Precision DPLL
- 0.1-1000 samples per second
- LCD and six status LEDs
- Integrated Seismic Switch
- Embedded open-source OS
- Embedded seedLink server
- Embedded earthworm server
- Continuous and trigger recording
- Advanced networking functionality
- Smart seismic network operation
GEOWarning, Early warning accelerograph
Overview
GEOwarning is a compact, ultra-low-cost digital accelerograph. It integrates three axes, a MEMS accelerometer, a 20-bit digitizer, embedded Linux OS, and GPS or NTP timing. SeedLink and Earthworm servers ensure reliable, real-time data telemetry, while a large storage volume ensures a long period of local data recording. The instrument has very low power consumption, so a small 12 V DC battery can power it. Due to its small size and flexibility for communication protocol (Ethernet or WiFi) and timing (GPS or NTP), it can easily be installed at buildings and other structures. The device supports a software configurable, variable range of +/-2 g, +/-4 g, and +/-8 g, presenting an ideal solution for a wide range of structural monitoring and early warning applications. Minimum data latency and the calculation of an earthquake’s Cumulative Absolute Velocity (CAV) guarantee that the user can be alerted immediately at the beginning of an event. Compact design is a competitive advantage and is reflected in the price, which is only a small fraction of the typical commercial accelerograph’s cost. The user can now deploy five times more units for the same budget.
+ Features
- Three components miniature Accelerograph
- Range +/-2g, +/-4g, +/-8g
- Low power consumption
- Ethernet and WiFi
- Dimensions 90 X 115 X 55 mm
- 20bit analog to digital converter
- Embedded Seedlink and Earthworm Server
- Realtime Telemetry and Local Storage
- MiniSEED data format
- Linux OS
- Web Configuration Interface
- SSH, SFTP, HTTP NTP
- SPDT relay, software configurable
- Dynamic Range 85dB
- STA/LTA, PGA, CAV
- Operation Range: -20 +70 C
- Waterproof IP67 Aluminum Case
GEOTinyAC! Compact Digital Accelerograph
Overview
GEOtinyAcc is a compact miniature digital accelerograph that integrates three acceleration channels. It is a GEOtiny! seismometer equipped with an acceleration sensor. It supports a high-resolution 24-bit digitizer (optional 32-bit ADC), embedded Linux OS, and GPS or NTP timing. Seedlink server ensures reliable real-time data telemetry while large storage volume ensures long-period local data recording. The instrument has very low power consumption, so it can be powered by a small 12Vdc battery.
Design simplicity a great advantage and is reflected in the price, which is only a fraction of the cost of common commercial accelerographs. The sensor delivers superior signal-to-noise ratio and broadband response. The accelerograph communicates through an ethernet CAT5 connection or WiFi. The user can just plug the power on and connect with the unit. The device is compliant with the Los Angeles building code.
+ Features
- Three-axis accelerometers
- Ultra Low Power Consumption
- Only 130mm D/ 76mm H
- MEMS (Force balance / ASIC technology)
- DC – 750Hz, Wide Dynamic Range 96dB
- Output range +/-2g to +/-12g linear
- Noise level 6ugrms/sqrt(Hz)
- Integrated 24bit digitizer, miniseed data format
- Local storage and/or telemetry
- Integrated seedlink and Earthworm servers
- Web interface, SSH, FTP, SFTP
- Operating temperature -20 to +70 C
- Aluminium IP68 case
- This device is compliant with the Los Angeles building code.
