Re: High frequency transducers
Dear James,
It looks like we have a technology applicable for the
problem you have mentioned.
We had to develop special transducers for shock and high
frequency high G accelerometer calibrations.
We may propose an approach that used controlled shock
pulse excitation. For microstructures you have described
a shock pulse with 0.5-20 microseconds pulse width seems
to be applicable. Such a pulse may be applied directly
to the surface microstructures or acoustically.
Currently we use half sine squared pulse shapes. Pulse
shape is precisely controlled. Resulting surface motion
is observed by self-calibrated multi-channel Michelson's
interferometer.
If structures under test expected to be linear, shock
calibrations and sine wave based calibrations generate
the same results. Otherwise, more careful investigations
are required.
Currently, the technology we possess provides up to 0.03%
accuracy for accelerometer sine-wave calibrations and
0.05% for high G shock. Sure, this makes non-linearity
and zero-shifting of PE based commercial accelerometers
quite evident at 1000g and upper level.
Please, do not hesitate to contact me if you need
additional information.
Alexander Morzhakov,
Volga Advanced Technologies, ltd.
Delovaya str.6-8
410040 Saratov, Russia
sasha@volgatec.saratov.su