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Application notes

Application notes

Identifying unsound resonances of smartphone loudspeakers
Characterizing the dynamic response of loudspeakers is essential to optimize their performance in a wide range of appliances. Here, we used SmarAct’s PICOSCAN Vibrometer to analyze the response of two smartphone loudspeakers from different manufacturers. The ability of the instrument to directly image vibrational modes of mechanical structures allows to attribute discontinuities in the amplitude spectra to specific resonances of the loudspeaker diaphragm or housing.

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Vibration measurements through silicon with IR laser-light
Both SmarAct’s PICOSCALE Interferometer and PICOSCAN Vibrometer are based on an infrared 1550 nm laser source. A unique advantage of using such wavelength is that it allows to ”look” through silicon windows and measure vibrations of underlying structures such as AFM micro cantilevers.

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Measuring through obstacles with confocal optics
Background signals in interferometric measurements can be efficiently suppressed by using a focused measurement laser in combination with a confocal optical design. Thus, the detection volume is limited and only light that is reflected from the exact measurement position will reach the detector. Both SmarAct’s PICOSCALE Interferometer and PICOSCAN Vibrometer employ a confocal measurement principle which allows accurate vibration measurements of a sample also when it is placed behind a partially reflective window or object.

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Radial run-out and wobble
In high precision engineering the precise knowledge of the movement of a rotating target is of crucial interest. Radial run-out and wobble of a rotating spindle may have significant influence on the quality of a workpiece, and thus needs to be reduced. However, any correction requires an error signal, and thus the run-out and wobble need to be measured accurately.

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Measuring on small objects
In this application note the vibration modes of an AFM cantilever are analyzed. Our focusing sensor head PS-SH-F01 is used for this purpose.

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Thermal expansion coefficient of Invar and long-term stability
Here, we demonstrate the measurement of the thermal drift of Invar, which is a metal alloy with extremely low thermal expansion coefficient.

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High resolution differential measurements with the PicoScale laser interferometer
This application note shows how the PICOSCALE laser interferometer can be used to carry out high resolution measurements in the sub-nanometer range. By using a differential setup, noise caused by environmental influencing factors can be reduced to a minimum.

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High speed measurements in production environments
Today’s quality control standards stipulate an ever increasing precision of milled or otherwise produced parts. To achieve this precision, the errors and deviations of the production tools have to be measured with extremely high accuracy. Furthermore, the measurements have to be carried out with high bandwidths in order to discern aberrations at high frequencies.

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