Hello PSN,

I know with a velocity sensor the voltage increases with frequency after 
F0 if given the same
vertical motion amplitude. This seems to be because as the frequency 
increases
so does the velocity and thus, the voltage output.

This means to me the energy also increases as the square of the velocity.
So like, double the velocity, quadruple the energy.

What i would like to do is: filter at f0 (1.0Hz) so that given
a steady shake amplitude (sine wave) but incresing frequency
that the voltage will remain constant.

Now I understand this may not be possible.

If the sensor relationship to velocity and voltage be a linear
equation, I will not be able to filter properly using RC network
N=1 or N=2 because, the filter is NOT linear but log, thus, a RC filter
will not properly cancel the linear increase and, what you need, is to
somehow apply a mathematical solution to the raw data after recording
using a computer program of some kind ?

Is anyone sure of anything I have said here and if so can
someone tell me the proper way to handle this ?


Regards,
geoff (GVA)
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