respiration rate

Hello! Im just a student in biomedical engineering and I need to detect the rate of breathing on labview based on accelerometer three axes, I m using the z axis accelerometer for movements of the chest and thorax breathing, but I do not see the signal of respiration. Also I use an analog butterworth filter with cutoff frequency of 1 hz (the frequency of respiration cause is between 0.1 and 0.5 hz) and a digital filter on labview. So that's my question, how can I take samples low frequencies or the signal is filtered? I am attaching the file vi that I use. Thank you!


An accelerometer is not able to travel, it measures acceleration.  But I suppose the signal is oscillating so if all you want is the respiratory rate, then it will work very well.  You probably need a bandpass filter with a low cutoff around 0.1 Hz frequency to eliminate any gravitational constant acceleration.

I'm not really familiar with the screw Express, but the filter there is no initialization entry, so it can be reset for each set of data that are acquired.  You can use the standard filter function in the range of Signal Processing.

Tags: NI Software

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