IVS basics

Become an IVS expert: Successful use of non-contact vibration measurement technology in the industrial environment

The IVS-500 as the perfect sensor for the vibro-acoustic end-of-line test

Why are more and more laser Doppler vibrometers used in production for vibration measurement?

For years, there has been a trend in the automotive sector, in household devices and consumer electronics products to constantly reduce disturbing noise in order to make products more and more quiet and improve acoustic comfort. But not only the acoustic comfort is important, also the quality and thus the 100% error-free production must of course be guaranteed for all products. Component defects that produce sounds inaudible to humans can also lead to total failures in the field. With the IVS-500 this can be prevented.

Vibration measurements allow on the one hand to evaluate the acoustic behaviour at the end of the production and on the other hand to detect manufacturing defects by a specific analysis of the vibration data and to assign them to the defect.

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Why laser Doppler vibrometry?


The object to be measured is not influenced by an additional mass or force during the measurement. The vibrations to be measured are therefore not distorted. 


Measurements up to 100kHz are possible with the IVS-500 easily. This is essential for finding complex manufacturing defects at higher RPM.


The non-contact measurement also eliminates the need for a mechanical infeed device, which reduces the effort of integrating the laser vibrometer into the production line.  This allows very fast cycle times and short test cycles.

Due to the measurement of surface vibrations, the digital or analog data transfer and the very high resolution, the laser vibrometer is extremely flexible and can be used in various and also difficult test applications. Measurements can also be carried out in noisy production environments.

Which sensor is the right one for my noise and vibration test?

For the vibro-acoustic end-of-line test, practically 3 sensor types are possible:

  • Microphone
  • Accelerometer
  • Laser vibrometer 

Laser triangulation is another optical measurement technique. Due to its low resolution and bandwidth it is not considered.

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Introduction to Laser Doppler Vibrometry

Laser Doppler Vibrometer (LDV) use a laser as a measuring device. When the laser hits the target, the Doppler effect causes a frequency shift of the reflected laser beam as soon as there is a relative movement between the target and the sensor (LDV). This frequency shift is evaluated in the IVS-500 with a high-precision heterodyne Mach-Zehnder interferometer to measure the smallest vibrational displacement, velocity or acceleration. Laser Doppler Vibrometers also make it possible to measure smallest vibration changes up to the MHz range or even into the GHz range by evaluating the frequency shift due to the Doppler effect.

Laser Doppler Vibrometers also have a measurement accuracy of the vibration amplitude of better than 1% and thus represent the highest accuracy class among the presented vibration sensors. Laser Doppler Vibrometers are used as primary calibration standard for the calibration of acceleration sensors according to ISO 16063-11.

More information abour this technology

Contact your Polytec IVS expert:

Email: [email protected]
Phone: +49 7243 604-2220