Cross Correlation and time lag

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Jade Sen 2015-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/210345-cross-correlation-and-time-lag

评论： dpb 2015-4-20

So in my project work, i placed two accelerometers on a single vibrating body and i want to find the timelag between the signals at either end...

[Correlation,lag]=xcorr(voltage1,voltage2);
corrlength=numel(Correlation);
[mag,Index] = max(abs(Correlation));
sampletime=0.003 ;%data acquisition
timelag=lag(Index)*(sampletime);

------------------------------------- voltage1 and voltage2 are bandpassed signals from the accelerometers in a specific noise range

But everytime i run the function, the timelag and lag amounts to zero, no matter how much i adjust the accelerometer sensitivity and position. Is it supposed to be zero? Or am i doing something wrong?

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Jade Sen 2015-4-19

oh thanks, ill try increasing the sampling rate then. Im using a simple second order butterworth bandpass, btw.

dpb 2015-4-20

I'd start by looking at the two raw data signals with a scope triggered off the input first, then Accel A and see if the experimental setup is ok first...

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