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Application notes

Application notes

Application notesIdentifying 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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Application notesVibration 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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Application notesMeasuring cantilever bending modes and displacements with sub-pm resolution
When using micro-cantilevers as sensors it is important to have methods to monitor their displacements at high resolution. Key example is atomic force microscopy where knowing the dynamic behavior of the cantilever allows a better control of the interactions between cantilever and sample. This helps to minimize sample damage and to maximize resolution. Furthermore, the spring constant of a cantilever, an essential parameter in force spectroscopy measurements, can be calibrated by measuring the thermal vibrations which can be as small as a few hundred femtometer. SmarAct’s PICOSCAN Vibrometer can be used to image cantilever bending modes and provides sub-pm resolution measurements of its vibrations.

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Application notesMeasuring 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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Application notesDissecting the dynamic response of an ultra-fast actuated mirror
Piezo-electric elements are widely used to design dynamic actuators. In such devices, the dynamic performance is not only determined by the piezo element itself but also by the packaging and mounting conditions.
Here, we used SmarAct’s PICOSCAN Vibrometer to directly visualize the vibrational modes of the different components of an ultra-fast actuated mirror. This dissection of the dynamic response allows to attribute particular resonance peaks to specific parts of the assembly. The results can be exploited to control and to improve the design of actuators that operate under challenging dynamic conditions.

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Application notes

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. In this application note, the PICOSCALE Interferometer and line focusing sensor heads are used to measure the trajectory of a polished clyinder surface.

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Application notesMeasuring on small objects
In this application note the vibration modes of an AFM cantilever are analyzed using the PICOSCALE Interferometer and a focusing sensor head PS-SH-F01. The first eigenmode of the cantilever is identified using the internal signal generator and the Breakout-Box to excite the object.

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Application notesThermal 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. The PICOSCALE Interferometer and a standard sensor head are used in a laboratory environment.

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Application notesHigh 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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Application notesHigh 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. The PICOSCALE Interferometer and a standard sensor head are used to track the movement of a fast spindle.

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Application notesMeasurement on a water surface
In this application note, the measurement beam of a PICOSCALE Interferometer was focused onto a water surface, constantly tracking the filling level of the basin.

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