Structural Health Monitoring Innovations: Observer Can Power Your Entire SSI Operational Modal Analysis

Digitex System designed the Observer Suite to bring automation and accuracy to your Operational Modal Analysis (OMA) tasks. Whether you’re diagnosing buildings, bridges, dams, or mines — Observer turns your data into results with industry-grade precision for any infrastructure type.
In this release, Observer enables automated SSI-based OMA, offering two powerful algorithms:
Inside The Observer’s SSI Group
Digitex Systems is on a mission: to combine high-quality sensor-grade reliability (via MEMS tri-axial accelerometers, digital inclinometers, and digitizers) with intuitive post-processing software.
Now, with the SSI methods fully integrated, Observer offers you a robust SSI toolkit — merging research-grade techniques with an interactive and easy-to-use interface. Also, we made easier the multiple data set SSI and removed all data-driven quantification uncertainties that usually pop up!
Observer brings you the automation and visual clarity required for precise structural assessment using the two most relied-upon subspace-based OMA methods.
How SSI-COV & SSI-DATA Work in the Observer
Following your non-destructive testing measurements, simply import or create your geometry and set your Operational Modal Analysis configuration. Initialize your parameters and geometry before you click the “Apply Changes” button.
From there, choose your SSI method and click “Calculate”, and Observer will display your full Stabilization Diagram Analysis.
In just a few seconds, your screen will show you four important SSI aspects:
- The Stabilization Chart
- The Frequency-Damping Clustering
- The Singular Value Plot (Hankel Matrix)
- And full 3D Mode Shapes for the identified frequencies and dampings.
SSI-COV – Covariance-Driven Subspace Identification
Observer’s SSI-COV method performs OMA using correlation matrix models, delivering robust modal identification under high noise.
You’ll get:
- Detailed mode stabilization detection
- Mode shape identification
- Calculated frequencies & damping ratios
- Automated classification of stable vs unstable poles
All are directly visualized and linked to your structure’s imported or created 3D geometry.
SSI-DATA – Data-Driven Subspace Identification
Observer’s SSI-DATA utilizes raw time-domain data to perform subspace modeling, excelling in systems with high noise or closely spaced modes.
Just like with SSI-COV, Observer automatically:
- Displays stabilization charts
- Extracts frequency/damping via pole clustering
- Generates singular value plots
- Builds full 3D mode shape visualizations for each mode
Even better — SSI-DATA is perfect for real-time or long-duration Structural Health Monitoring projects!
Conclusion
Observer gives you full command over SSI-based Operational Modal Analysis — using the SSI-COV and SSI-DATA methods trusted by top SHM engineers.
From bridges to buildings, this is a non-destructive evaluation made automatic. All features are in one intuitive platform built to help you deliver results — fast, accurate, and visualized.
Whether you’re in research or diagnostics, Observer with SSI OMA support brings clarity, automation, and unmatched insights. Digitex Systems made Structural Health Monitoring OMA analysis easier than ever before!