How to get the index of the minimize point

Need to get the index of the minimize point, marked as red cycle in the attached word file.
It is a collected data from different sample devices, so the curve may change a bit each time. But the overall profile is the same, just 2 main peaks.
I tried to detect the Y difference to see when the difference values change from negative to positive.
But, there are noise as tiny peak when zoom in, shown in word file. Then tried to use median filter to make it smooth. (Maybe better method should be used.)
But there are still some bigger regional peak. Any suggestion?
Is there any labview function or better algorithm can make it. Many thanks for your help.
Solved!
Go to Solution.
Attachments:
Curve shots(zoom in).doc ‏294 KB
Sample Data 1.vi ‏22 KB
Sample Data 2.vi ‏16 KB

A trick I often use is to sample the data with a much higher speed than needed. Then I apply some simple averaging methods or and median filter. After that I downsample the signal to a adequate rate by averaging x samples. This have been a saver for me more than once. How successful it is depends of noise character type. It just a hint as it may not be applicable in your application 
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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