FPS Sensor
Systems
PAGE 202
Selected Measurements
real-time vibrometry measurements
Vibrometry measurements as performed on a piezoelectric
ceramic, measured with a FPS system. Stunningly, vibration
amplitudes of few picometers can be detected even at low
frequency.
Ultra-wide frequency range vibrometry
The FPS sensor is not only a very capable real-time displacement sensor
but it also serves the user as a powerful vibrometer. With its built-in
fast-Fourier algorithm (FFT), the FPS series directly detects the distribution of vibrational modes/amplitudes in frequency space. Frequency
and phase information of resonance peaks can be live-viewed on the
PC-based FPS application software. The data above demonstrate the
suitability of the FPS sensor for this type of application. In this specific
case, the low-frequency noise behaviour of the FPS sensor was tested
by exciting and measuring the vibration spectrum of a ceramic piezo at
low frequency and ultra-low amplitude. As can be seen from the data,
the noise floor of the measurement is at 106 microns equivalent to 1
picometer. Stunningly, this noise floor extends to very low frequency,
enabling picometer resolution at frequencies as low as 2 Hz. Data are
recorded at 100 Hz bandwidth.
(attocube applications labs, 2014)