Scanning Vibrometer PSV QTec by Polytec

Non-contact vibration mapping made fast and easy with PSV-QTec

All mechanical structures fail sooner or later if the applied forces exceed the structural limits. These limits need to be understood in depth so breakage can be avoided. Depending on the structure, the failure of just one component could result in the catastrophic breakdown of an entire system. Therefore, design and test engineers work closely together in product development to safely achieve a fast time-to-market. Simulations are valuable in evaluating many design iterations quickly; validation tests, on the other hand, are instrumental in making sure the model reflects the real-world scenario. This is important for critical components in aerospace, automotive, medical devices, civil structures, consumer electronics and many other products.

QTec is a revolutionary technology and supersedes conventional non-contact Laser Doppler Vibrometry (LDV) in its core design allowing the user to obtain reliable data more quickly.  Polytec’s PSV-QTec systems are capable of scanning an entire surface at high speed and thus obtain a full-field vibration map, which is used in many application for modal testing and troubleshooting.


  • QTec is reliable: there is minimal risk of signal artifacts (like dropouts) due to low signal return. Consistent results with superior optical sensitivity can be expected even in the most difficult setups like steep incidence angle, low reflectivity, and speckle motion. The data traces in the time domain are free of artifacts enabling accurate interpretation of the data.
  • QTec is easy: setting up a PSV-QTec system is easy as no surface treatment needs to be applied to the test object.
  • QTec is fast: in addition to faster setup times, the superior optical design eliminates the need for averaging in most applications, leading to dramatically reduced measurement times.  Scans have shown to be up to 10x faster than with conventional vibrometers.

Revolutionary technology

QTec is a novel approach in its core technology, the optical interferometer.  Using a multipath interferometer design, the integrity of the vibration signal can be maintained at the very front stage of the vibrometer.  The result is an enhanced accuracy and robustness of the vibration data independent of the object’s surface properties. 

QTec is designed for real world applications in real-world environments, where the optical properties of the test surface are not well controlled. Reliable performance of the PSV-QTec gives the test engineer confidence in the data while making the acquisition process efficient and hassle-free on the most challenging test articles.

Accuracy in model validation

Reducing the number of prototype iterations and thus speeding up the design cycle requires a high level of accuracy in the modal test results.  Therefore, in the case of complex structures, the full 3D vibration response is needed, containing out-of-plane as well as in-plane information.  Polytec’s PSV-QTec-3D obtains a triaxial response at each measurement location across the scan grid allowing the user to analyze the x, y and z vibration component of the test structure.

Various accessories and software options make measurements possible on very small structures (order of a few millimeters) up to large structures (several meters in dimension).  The frequency response ranges from DC up to 25 MHz accommodating ultrasonic device characterization and traveling wave analysis for NDT purposes.

User friendliness

Letting the test operator experience success with ease is one of the main goals of Polytec.  The software user interface allows setting up a test with only a few clicks, thanks to a new automatic optical alignment feature that is based on state-of-the-art machine-vision technology.  The software platform comprises a custom API for full automation and integration of test sequences in the lab and on the manufacturing floor.  Multiple-input multiple-output (MIMO) feature a maximum channel count up to 8.  On the data analysis side, optional plug-ins accommodate curve-fitting and strain map distribution analysis. 

QTec Scanning Vibrometers from Polytec are advanced for quick noise and vibration measurements in the field of research and development. They identify operational deflection shapes and Eigenmodes for NVH, FEM validation, acoustics, ultrasonics, structural dynamics and NDT.

PSV QTec Scanning Vibrometers come as a small and portable laptop version or as a strong rack-type workstation, like a 1D or 3D system. Users can choose between various models that cover frequencies ranging up to 25 MHz or upgrade to a PSV QTec 3D vibration measurement system for extensive analysis of both in-plane and out-of-plane motions of vibrating structures.


Automatic 3D alignment for optical 3D vibration mapping | PSV-3D Scanning Vibrometers

Video Credit: Polytec

PSV QTec-Reinventing Full-Field Optical Vibration Mapping

Video Credit: Polytec

Scanning Vibrometer PSV QTec by Polytec

QTec® Multipath interferometer principle.
PSV QTec compact scanning vibrometer for experimental modal analysis.
PSV QTec Scanning Vibrometer as rack-type version with integrated workspace.
PSV QTec Scanning Vibrometer with best SNR on technical, rotating, dark, and more challenging surfaces.
PSV QTec Scanning Vibrometer for acoustic and experimental modal analysis.
PSV QTec with PSV-A-610 Close-up Lens for microscopic analysis of small structures.
PSV QTec 3D Scanning Laser Vibrometer for 10x faster results and accurate modal test data acquisition.
PSV QTec 3D Scanning Vibrometer with handheld geometry scanner for practical import of sample geometry data.
PSV QTec 3D vibration measurement system mounted on PSV-A-T51 test stand for NVH analysis.
PSV QTec 3D Scanning Vibrometer as rack-type with practical integrated workspace.
PSV QTec 3D Scanning Vibrometer with PSV-A-T34 stand for compact test setups.

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