How to calculate the acceleration of a digitally measured distance

Hello reader,
I'll try to explain my problem. I'm using a laser displacement sensor in order to measure the movement of a vibrating table (approx. 20 Hz). The controller of the sensor is connected to my COM port and I read 213 distances per second. (maximum because of baudrate).
With this signal I want to calculate the acceleration of the table. The problem is that the signal is not 'smooth' enough (about 10 data points per period) to derive it directly.
I was thinking about applying some kind of curve fitting and use this signal as the input for the double derivation. I have however problems with creating a proper input for the General polynomial fit.vi. Another idea was to use the Extract si
ngle tone information.vi. This however also fails to work (yet) also.
So my questions are mainly if someone thinks there is a much better or easier way to solve this or that someone can provide help with building what I described above.
Many thanks in advance for your answer!
J-M

Hello,
First of all thanks for your fast answer.
I'll try to provide you some additional information:
I expect my signal to be almost a pure sine tone, although there might be some (small) noise. Where my main problem is, is that I'm reading data through my serial port after which I convert it to a number. The main difficulty (or at least the first) is to convert these numbers into the required input for these vi's.
(a waveform for the FFT power spectrum.vi or an array for the power spectrum.vi)
This includes your second question: I'm afraid I'm using the asynchronous acquisition. Any ideas to avoid this?
I'm currently using Labview 6i. I attached my current vi (it does not show all the time I'm already trying!)
Thanks in advance fo
r your reaction,
J-M
Attachments:
Distance_reading_8.vi ‏98 KB

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