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Vibrometry

How does it work?

The PICOSCAN Vibrometer is developed for megapixel imaging of vibrational modes of microscopic structures. This is achieved by raster-scanning a tightly focussed laser beam of a Michelson interferometer over the sample to measure the vibrations for each pixel of the microscopic image.

Our vibrometer is equipped with a piezo-based sample shaker and a digital lock-in amplifer to measure amplitude and phase of the vibrations from which bending modes of up to 2.5 MHz can be reconstructed.

Unique features

  • The interferometer laser beam is used simultaneously to record a confocal reflection image of the sample, which is intrinsically aligned with vibration measurements. Thus an additional microscope imaging system is not required.
  • Even though the controller and UHV-compatible scanner are kept very compact, it provides structure scans with a size of 20 mm.

Reconstruction examples

The animated figures show a loud speaker at different excitation frequencies 5 kHz, 25 kHz and 50 kHz. Furthermore the reflection image provides a direct impression of the properties of the surface materials. The graphics were generated from raw data, no interpolation was performed.

Single point vibration measurement

The PICOSCALE interferometer also provides the ability to measure vibrations. Therefor the Fast-Fourier-Transform of the position signal can be calculated within the PICOSCALE software.

The PICOSCALE is capable to measure vibrations with extremly low amplitudes (1 pm) due to its very low noise level.