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HEAD acoustics showing excitation with multiple Qsources light weight shakers on a smart cleaner device.

The sound emission of the new autonomous devices surrounding us is specially critical. On the cleaner device, shown on the HEAD acoustics booth, several excitation locations were prepared. The set up shown on Sensor and Test in Nuremberg Germany allows application of various techniques, contribution analysis, FE model correlation, etc.  

Qsources light weight shaker on electronics board combined with Polytec laser doppler on Sensor and Test Nuremberg Germany

As an example of controlled high frequency excitation of electronics, Polytec showed  the measurements on a microprocessor component mounted on a large board. The Qlws shaker was used for sine sweeps between 250 and 10000 Hz. 

Extension of Polytec’s portfolio with a Qsources structural excitation solution

10th May 2022

  • Vibration Measurement system offering
  • Small exciters, +/-25 mm, for limited spaces and covering a broad frequency range from 250 Hz, or lower, up to 13000 Hz.
  • Providing an versatile and stable excitation for  moderately sized structures and systems.
  • Ideal addition to the Optical Vibration Measurement solutions currently offered by Polytec.

Polytec was founded in 1967 in Germany as a distributor for optical measurement technology in industrial and research markets. Today the Polytec group has about 400 employees, 12 international facilities and 25 distribution partners in 60 countries and specializes in the technological fields of Vibrometry, Velocimetry, 3D Surface Metrology, Process Analytics, Image Processing and other optical systems.

Polytec today announced that it will include the Qsources Qlws lightweightshaker and dedicated amplifier Qma as part of the product range aimed at providing Optical Vibration Measurement solutions.

“Qsources electrodynamic shakers are the ideal complement to Polytec’s non-contact vibration measurement systems. With Qsources’ patented technology, we are able to offer our customers an easy-to-use, highly accurate and compact excitation source for their vibration investigations” commented by Eric Winkler, Vice President and Head of the Business Unit Optical Measurement Systems at Polytec.

Qsources, located in Belgium, is focusing on both structural and airborne smart excitation technology. The sensor integrated and patented excitation solutions are used in various challenging applications.  Across electronics, medical, automotive, aero-space, household, defence, room acoustics,…  various application domains are covered. Through its solutions, and way of working, Qsources hopes to contribute to a comfortable, healthy and safe environment. 

The Qsources Qlws lightweightshaker is a patented self-suspending, self-aligning dynamic decoupled electromagnetic shaker specifically developed to carry out consistent repeatable structural excitation in a limited space. The Qlws shaker is combined with the dedicated Qma single channel amplifier allows for consistent, repeatable and accurate transfer function measurements.

“It is impressive to see the possibilities created by non-contact surface scanning in combination with controlled excitation. We are looking forward to work with Polytec.  The different areas of application covered by Polytec’s Optical Measurement division allow a significant extension of the reach of our excitation solutions. This further builds on our goal of supporting our customers to efficiently improve their products” stated Peter van der Linden, founder and managing director of Qsources.

For more information on Qsources, please visit:

For more information on Polytec, please visit:

HEAD acoustics expands its portfolio with Qsources structural excitation solution

9th May 2022

  • HEAD acoustics to include the Qsources’ Qlws lightweight shaker, and supporting amplifier, into its structural analysis solutions
  • Qsources excitation solution for efficient and accurate transfer function data gathering to support modal analysis, transfer path analysis and model correlation applications
  • Small exciters, maximum dimension smaller than 25 mm, for limited spaces and covering a broad frequency range from 250 to 13000 Hz
  • Providing an excitation solution for many moderately sized systems in the sound quality critical frequency range.

HEAD acoustics, one of the world’s leading providers of holistic solutions for sound and vibration analysis, today announced that thanks to specific cooperation with Qsources, it can now include the Qsources Qlws lightweight shaker and dedicated amplifier Qma for its solution offering world-wide.

This comprises an interesting and significant extension of the HEAD acoustics’ product portfolio by offering a total solution of structural excitation, data acquisition and analysis software.

“We continuously develop our hardware and software to provide our customers with advanced holistic solutions. Thus, expanding our portfolio with a Qsources shaker is a natural step. The Qlws lightweight shaker ensures the efficient and accurate acquisition of transfer functions and supports both modal and transfer path analyses. This more profound understanding of vibration characteristics is the basis for optimizing the sound quality of our customers’ products,” says Dr.-Ing. Aulis Telle, Managing Director Sound, Vibration and Perception at HEAD acoustics.

Qsources, located in Belgium, is focusing on both structural and airborne smart excitation technology. The sensor integrated and patented excitation solutions are used in various challenging applications. Across automotive, medical, aero-space, household, room acoustics,… various application domains are covered. Through its solutions, and way of working, Qsources hopes to contribute to a comfortable, healthy and safe environment. 

The Qsources Qlws lightweight shaker is a patented self-suspending, self-aligning dynamic decoupled electromagnetic shaker specifically developed to carry out consistent repeatable structural excitation in a limited space. The Qlws shaker combined with the dedicated Qma single channel amplifier allows consistent, repeatable and accurate transfer function and data acquisition.

“We at Qsources are excited to support HEAD acoustics with this excitation solution. The worldwide contacts and the expertise of HEAD acoustics enable us to reach professionals working on improving the sound of their products. Many kinds of devices, machines, and objects surrounding us could benefit from the diagnostic and optimization techniques based on transfer function data. Working with HEAD acoustics, Qsources can bring accurate and efficient vibration excitation as part of the solution.” adds Peter van der Linden, founder and managing director at Qsources.

For more information on Qsources, please visit:

For more information on HEAD acoustics, please visit:

Qsources’ position on the invasion of the Ukraine by Russia

We, at Qsources, are convinced that the current attack and lasting partial occupation of Ukraine by Russia is a danger to all democratic and free countries in Europe and worldwide.  This is a catastrophe for the Ukrainians but also in a lesser degree for most Russians, both are paying the price for this.

At Qsources we are implementing whatever we can to prevent that we contribute to the financing the current Russian regime.  To be extended:

  • no more tanking at LukOil
  • limiting our carbon based energy consumption (of all sorts) to a minimum
  • scanning our supplier base for Russian ownership, regardless of the location of production
  • we will also no longer supply any products nor services to Russia as long as the current regime is in place

Let’s be clear !  In our view Russia has no right to occupy territories outside of Russia. Given the blatant lack of respect for international law and human rights we are in favor of suspension or cancellation of the rights with regards to the ownership and rights of residence for all Russians outside Russia who have profited and done well under the current regime.

Demonstrating vibro-acoustic reciprocity with a vacuum cleaner!

Our smart vacuum cleaner is just one of the lightweight mechatronic devices buzzing, humming, groaning and scraping around us.

Demonstrating the principles of vibro-acoustic reciprocity on this will not directly improve its sound. However accurate measurement data of vibro-acoustics will improve both numerical models and the understanding of the operational loads on the device.

Vibro-acoustic reciprocity between 300 to 7000 Hz, captured with just a tiny accelerometer, microphone, very small shaker, volume acceleration point source and, not to forget, our vacuum cleaner, is a way to show Qsources has accurate small scale excitation covered !

We had fun putting this demo and video together and, as a bonus, now have a far better understanding of our vacuum cleaner ! It hopefully provides you with an idea on the wide range of potential applications of our products aimed at making the world a more quiet place.

The most powerful, lightweight sound source & amplifier for building acoustics: Qsources Qohm & Qam

Check out our latest video for Qsources Qohm and Qam.

Qohm is the ideal sound source for different acoustic measurement situations:
– Room acoustics
– Building isolation testing
– Facade isolation testing
– etc.

This source is extreme lightweight & powerful. Request your demo via our contact form.

Sound source suitability for in-situ noise barrier measurements

KU Leuven (Belgium) & Qsources analysed sound source suitability for in situ noise barrier measurements according to EN 1793-5:2016.

This method aims at optimizing the reliability of field measurements of reflection and scattering on barrier surfaces. Measurements took place at the Laboratory of Acoustics at the Department of Physics and Astronomy of KU Leuven.
Qoms2 (monopole omni-directional source) as well as Qohm (lightweight high output dodecahedron) were measured in comparison with a conventional sound source. During this study the direct sound arrival was analyzed using a microphone grid placed in a large reverberant room. Impulse responses where measured using different settings of the DSP controlled Qam measurement amplifier.

A preliminary analysis showed significant differences between the sound field characteristics of the Qsources devices and the ones of the conventional sound source, indicating a potential advantage of the Qoms2 source.

Other interesting tests such as measurements against surfaces with different absorption characteristics are planned in the near future.
Qsources would like to thank KU Leuven and Prof. Dr. Christ Glorieux for the cooperation.

Determining sound power of fixed machinery

This article investigates how to measure sound emission in an acoustically complex environment by using a reference sound power source.

The reference source method provides fast and low complexity measurements of sound power on-site in arbitrary acoustic environments.
Qsources Qref , a small and lightweight sound power reference source, was used to improve the accuracy of the sound power reference method.

This blogpost was based on an application note and can be read in full via below link.

 Frequency Response Function (FRF) testing

Watch the recent Simcenter on-demand webinar about boosting digitalization in noise and vibration (NVH) product development and see our Simcenter-products being set-up and used.

Simcenter-Qsources Q-MED Low Frequency Monopole source was used for excitation in vibra-acoustic transfer function measurements.

Q-HSH High frequency shaker was used for modal analysis of CAE correlation. This shaker ensures excitation without damaging the surface with low hardness and changing dynamic stiffness of the structure.

Acoustic transfer function measurement executed in this webinar included Q-MHF Mid High Frequency Volume Source. This source was used to artificially generate noise from outside the vehicle.

In this webinar, you will learn how hybrid modeling uses test and CAE data, how FRF test data can help improve CAE models & how acoustic FRFs support vehicle package NVH design.

Acoustic comfort in atria and large halls

This article discusses acoustic comfort in atria and large halls & the effects of transparent foil roofs.
This study was presented by researchers of the Slovak University of Technology in Bratislava in cooperation with KU Leuven faculty of architecture.

The low frequency measurements conducted inside the building of the Berufsbildende Schule in Oldenburg, Germany included In-situ reverberation measurements, Sound pressure level decay
and Numerical analysis using room acoustic software.

Thanks to Monika Rychtarikova, Daniel Urbán, Carl Maywald, Lukáš Zelem, Magdaléna Kaššáková and Christ Glorieux and the team of KU Leuven and STU Bratislava for supporting the use of the article

Challenges of acoustic measurements in performance sites….

In measurement situations where control of sound quality and intelligibility are crucial factors, there can be certain challenges to be taken into account. These type of room acoustic measurements include:

  • Room Impulse Responses
  • Reverberation Time
  • Speech Transfer Measurements

Learn why a monopole sound source outperforms dodecahedron speakers.

Infra-Qsources Equipment Rental

Impress your clients using state-of-the art Infra-Qsources equipment.

Use the most lightweight equipment: no worries taking your equipment on-site & enjoy the easy set-up or simply try the Infra-Qsources sound sources & amplifiers for your project prior to purchase.

Infra-Qsources rental equipment allows you to use specific, “niche” measurement equipment for projects you don’t have to do on a routine basis.

Qsources developed a custom miniature Wind tunnel reference sound source for TU Delft Aeroacoustics & Wind Energy Research Group.

QindW is a custom miniature sound source with very low diffraction and excellent omni-directionality. A narrow and long design allows minimal impact on the flow and minimal feedback from the flow on the source output.

This Low Turbulence Tunnel experiment was part of the NWO-TTW THAMES project: Towards High-Reynolds Airfoil self-noise MEasurementS. The goal was to understand how to improve noise measurements in closed wind tunnels, with particular application to wind turbine blade noise studies. 

Low Frequency Sound Source Q-MED

Q-MED is a low frequency monopole source designed to measure vibro-acoustic transfer functions in and around vehicles.

The negligible diffraction makes it an accurate omnidirectional sound source up to 2,000 Hz. allowing typical vibroacoustic body noise transfer functions measurements including frequency response functions (FRFs).

A recent Siemens Simcenter blogpost provides a step by step approach to obtaining the most accurate results using corrected values for analysis and comparison to avoid influence of the source on the measured FRF.
This article explains how to use the data from the Q-MED calibration report as well as post processing calculations to account for variations of source sensitivity and applying corrections in amplitude.


ISO9001:2015 Certification

Following the audit of SGS, a leading company in inspection, verification, testing and certification, Qsources has successfully gained certification to ISO 9001:2015. The main feature of the ISO 9001 Quality Management system is offering a customer central approach including overall performance improvements and risk-based thinking. We at Qsources are proud to have gained this acknowledgement.

Simcenter Qsources Q-ISH used in modal analysis

A recent Siemens Simcenter blogpost discuses test-calibration of mode shapes. The test set-up includes Qsources Q-ISH integral shaker on the SimRod, a full electric sportscar at Siemens Simcenter. Control of the mode shapes allows modifications to increasing the range of a vehicle and optimizing the drivetrain.

Next to CAE based modal analysis the actual testing supports a balanced development.  However, testing can become expensive. The example of the Simcenter Qsources Q-ISH integral shaker shows that excitation and calculation can be performed in an easy and fast manner. The compact shaker can be attached and positioned easily under any inclination and has a patent protected self-aligning stinger-suspension system. This way the shaker can be mounted directly on the relevant excitation location.

McGill university in Montreal Canada installed a large set of Qohm sources with dedicated equalization equipment.

In the recording research centre at McGill, the very light weight omni-directional sources are used in experiments to influence musicians during their performance recording using replay. And, a set of two of the same Qohm sources are also used when going over the world to investigate the acoustics of large performance sites with exceptional acoustic properties. See the 16 sources suspended over the recording area at McGill in the shown photo.