Median filter isn't removing the spikes at the bottom

Hi all

I use a median filter to spikes of deletes for the acquisition of data in real time of thickness of an ultrasonic sensor. This filter works great to remove the upper tips, unfortunately the bottom spikes remains unchanged. I tried changing different grade in the median filter with no improvement.

Attached images are code LabView and graphs showing data before and after filtering. How can I remove these spikes at bottom also?

Thanks in advance

Apple

I think that your problem is your acquisition code, not the filter. The data set, you have posted has 969 items with values of 2.681 or 2.68. The other 54 elements have values as 2.6, 681, 1, 2, 8 and 68. An element has the value 5, and there the value 9.

What this suggests to me, it's that your VISA reading is not correctly synchronized with the data transmission device. Either you get partial messages or an occasional character that does not match your regular expression.  Look at the default value stored in the reading string in your VI. Unplug the display of ' \' character mode. It contains '\D5U=\F32.681\r\n2.681\r\n2.681\r\n' it looks like there two characters special \D5 and \F3 and then three values separated by carriage return, line feed. With this kind of protocol you should probably use the jump as a default line end character. Then search for the string \D2...\F2 which can be a header or channel ID. The rest is digital data.

Check with the creator of the device that sends data to determine the complete communication protocol.

Lynn

Tags: NI Hardware

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