How accurate is Motion Magnification?

How accurate is Motion Magnification?

Motion Magnification is the new star in the vibration analysis world. With an high speed camera, the object of interested is filmed for a short period (10 seconds). Later in the software, displacements of the object can be magnified to make vibrations visual.

News 4 June 2020

But people are asking how accurate it is? Well, the answer is in this short article.

On a small rotorkit was an accelerometer installed. The spectrum of the accelerometer was stored in a vibration analyzer.

In the Vibview software (Motion Magnification software) was a spectrum calculated at the location of the magnet in horizontal direction (same as accelerometer).

Spectrum collected with Motion Magnification Technology.

Spectrum collected with CSI2140.

We notice a difference of 3 % in amplitudes. This is very low and acceptable. Take in consideration that for example a datacollector has a tolerance in accuracy about 5 %. Same for accelerometer. So together there is already a margin of 10 %.

We notice a difference of less than 1 % in frequency. This is very low, acceptable and can be explained as difference in resolution of the 2 technologies.

The conclusion is that motion magnification is extremely accurate both in frequency measurement and amplitude.

However, some parameters must be taken in consideration. To have accurate data, lens type, distance between object and camera and camera type must be configured correctly in the software

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