Vibration measurement of a concrete slab under impact with Ommatidia´s Q2 System
The unique Laser Doppler vibrometer in the market performing multiple point simultaneous measurements.
Key Facts
The study shows the outcomes achieved, during a concrete slab impact test at the Institute of Structural Mechanics, Bauhaus University of Weimar.
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Bauhaus-Universität Weimar
Click below to download the Application Note
This Application Note showcases the results of the vibration measurements obtained with Ommatidia´s Q2 multiple beam Laser Doppler vibrometer, during a concrete slab impact test.
The Q2 Laser Doppler Vibrometer >>
The equipment used for the test is the Ommatidia Q2 Laser Doppler vibrometer based on FMCW Laser RADAR Technology (Frequency Modulated Continuous Wave).
The Q2 system has two operating modes:
• Laser Doppler vibrometer mode: measures the velocity or displacement of a surface, without contact.
• Metrology mode: measures the distance to the sensor and generates a point cloud.
The system features multichannel coherent detection, of 65 simultaneous laser beams for signal acquisition.
And, performs a full-field of view measurement by scanning the azimuthal angel of the sensor head.
Thanks to the use of a dedicated photonic integrated circuit (PICs), the Q2 analyzes multiple optical channels in parallel, enabling the simultaneous three-dimensional measurement of vibrations and displacements.
This report shows the measurement capabilities of Ommatidia´s Q2 System: featuring, Multichannel Coherent Detection of 65 simultaneous Laser Beams for signal acquisition.
Thanks to the use of a dedicated photonic integrated circuit (PICs), the Q2 analyzes multiple optical channels in parallel, enabling the simultaneous three dimensional measurement of vibrations and displacements.
Concrete slab impact-test questions
See how simultaneous optical velocity measurement turns a hammer impact into an engineering-ready view of slab dynamics.
How was the concrete slab tested?
A hammer impact excited the concrete slab at the Institute of Structural Mechanics, Bauhaus-Universität Weimar. Q2 measured the surface response without contact, while the university’s public procurement record also documents an academic Q2 Laser RADAR licence awarded in February 2026.
How was the spatial response captured?
Each Q2 acquisition captured 65 optical line-of-sight velocity channels simultaneously. Successive azimuth positions extended that synchronized field into a dense spatial map of the slab response.
What engineering results does the measurement provide?
The dataset connects time histories, spectra and spatial response patterns across the slab. Engineers can identify resonant behaviour, compare response regions and create repeatable baselines for structural assessment and model correlation.
How can this workflow support concrete-structure testing?
Combine the measured impact force, support condition, Q2 geometry, synchronized velocity field and repeated test points to compare slabs, track response changes and focus detailed inspection. Ommatidia can configure the optical coverage, references and engineering outputs for the test objective.
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