MonoDAQ-E-gMeter is a fully integrated low-noise MEMS accelerometer with EtherCAT interface and DEWESoft software support. This makes it a tailor-made solution for permanent condition monitoring on big structures such as bridges, antennas and stadiums.
Seismic noise performance
With only 25 µg/√Hz spectral noise density and 100 µg residual noise at 50 Hz bandwidth the MonoDAQ-E-gMeter is a cost-effective solution for seismic measurements. The FFT recorder below shows the residual noise of the three axes at the sample rate of 100 S/s.
Able to measure displacement
Even though the MonoDAQ-E-gMeter measures acceleration, it can also be used to precisely measure displacement by integrating the acceleration twice and applying appropriate filtering. The task is straightforward thanks to DEWESoft software environment.
In the experiment shown below the linear displacement of the gMeter is measured directly with a laser distance sensor and also calculated from measured acceleration. Results show great accuracy even at a low frequency of 1.5 Hz.
Product testing and validation
Hardware repairs or replacements are expensive on structures such as bridges. Therefore MonoDAQ-E-gMeter was put through in-depth product validation tests that ensure reliable operation within its specifications. Standard testing procedures include vibration and temperature cycle tests to check the durability and specify drifts in measured acceleration.
MonoDAQ-E-gMeter includes DEWESoft-LT software license. DEWESoft data acquisition software features hundreds of prepared calculation, display and analysis functions that do not require any programming from the user:
- time domain recorder
- XY recorder
- FFT recorder
- triggered storing
- statistics (RMS, peak-peak, STDV etc.)
- IIR-, FIR-filters
- integration, derivation
- array, vector analysis
- export to Excel, Matlab, Flexpro
Subject to additional DEWESoft license, the software also offers advanced engineering modules:
- modal analysis
- order tracking
- torsional vibration
- fatigue analysis
- human vibration
- combustion analyzer
- sound level & intensity
- custom C++ plugins
Since MonoDAQ-E-gMeter interfaces to software over EtherCAT, it can operate as a standard EtherCAT slave device and can therefore be integrated in any EtherCAT master system including:
- Beckhoff TwinCAT
- NI Labview
Systems based on MonoDAQ-E-gMeter hardware and DEWESoft software are installed all over the globe to perform important monitoring functions. One of the system integrators, ESSEBI, is integrating MonoDAQ-E-gMeter triaxial MEMS accelerometers in permanent structural monitoring systems.
»We are very pleased with the noise performance of the gMeter which allow us to perform operational modal analysis. The ease of use of the total solution together with DEWESoft software is very important to us as it is completely plug and play.« – Giorgio Sforza, ESSEBI Srl
Learn more in a detailed application note: Bridge monitoring with MonoDAQ-E-gMeter
Want to become a system integrator? Contact us.
Specifications of the MEMS accelerometer:
|Measurement range||± 2||± 8||g|
|-3 dB bandwidth||1000||Hz|
|Noise density (± 2 g)||25||µg/√Hz|
|Residual noise (± 2 g @50 Hz bandwidth)||100||µgRMS|
|Residual noise (± 2 g @125 Hz bandwidth)||150||µgRMS|
|Offset temperature drift (-40 … 125 °C)||-0.15||±0.02||+0.15||mg/°C|
|Sensitivity temperature drift (-40 … 125 °C)||±0.01||%/°C|
General specifications of the MonoDAQ-E-gMeter device:
|Power consumption||1300 mW|
|Supply voltage||12 … 48 V|
|Operating temperature||-20 … 50 °C|