Laser vibrometer PICOSCALE

scanningnon-contactoptical

When an object is set into motion, higher order bending modes often result in complex vibrational patterns, a phenomenon which is of critical importance in the design of sensors and actuators. For a full modal analysis of such devices, the measurement laser of the PICOSCALE Vibrometer is scanned over the sample and vibrations are measured at each pixel. From the recorded data a vibration image can be reconstructed. Measuring vibration of encapsulated MEMS When MEMS are packaged in a silicon enclosure it is impossible to use conventional optical measurement methods to evaluate their dynamic performance without opening them up. The PICOSCALE Vibrometer utilizes an infrared measurement laser with a confocal detection scheme which opens the way to analyze the dynamics of a motion sensor through its enclosure of silicon. We thank InvenSense, a TDK Group Company, for their support with this application example. 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 PICOSCALE 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. Testing ultrasonic transducers with vibrometry The performance of ultrasonic transducers can be evaluated by measuring the mechanical motion that is induced by an electrical pulse.