How can I split a waveform into chunks at each sawtooth?

Question

I have spent a lot of time trying to tackle this problem and hope someone can offer a useful insight!  I have attached the VI described here.
I am using Labview connected to a NI USB-6212 DAQ to create a voltage ramp, which drives a laser through its scan.  The laser is pointed at a detector, and I simultaneously read in a signal from that detector using the same DAQ. Because the detector is illuminated by the laser, it shows the scan ramp.  I would like to repeat this voltage scan and read-in indefinately.  Much of this system is working.  I have used the "RampPattern.vi" to create a sawtooth wave, which is output successfully to the DAQ.  As expected, the input from the detector shows the same sawtooth pattern.  However, I am having a lot of trouble managing and displaying the scanned sawtooth from the detector, which is currently read in as a waveform.
The challenge I can't seem to get around is manipulating or collecting the sawtooth in such a way that I can do two things:
1)  Display the incoming sawtooth a 'tooth' at a time.  Each sawtooth represents one laser scan, and I would like to see the incoming scan ramp as a single slope, not a series of sawtooths.  Ideally,as each scan came in, it would replace the prior scan (as in the Labview 'graph'), so that the plot would show a motionless scan that would flicker up the input of the last scan.
2)  Split the incoming sawtooth at each ramp into an ever-updating array that could be acted upon with the math functions, saved to a file, etc.
I have the feeling that this wouldn't even be a speedbump for an experienced user, but I have been hung up on it.  Could I collect the incoming analog signal from the detector in chunks that are the length of each ramp?  Could I trigger an event at each ramp that would split off the waveform into an array?
I am open to any suggestions!  Thank you for the input and help,
Sam
Solved!
Go to Solution.
Attachments:
scancode_topost.vi ‏129 KB

Answer 1

Problem solved!
The solution was to wire the "number of samples per channel" setting in the DAQMx Read VI.  I set the 'number of samples per channel' to the number of points in each sawtooth scan (that is the same value as 'number of samples in waveform' used to generate the sawtooth in BasicFunctionGenerator.vi).
The DAQMx Read Analog VI now reads one sawtooth at a time.  The Waveform Graph displays each sawtooth, one at a time, as captured.  The output waveform also has the proper dimensions (the length of the scan) and I can perform math operations on each single scan.
Works great! I have posted the operational code.
Attachments:
fullsimulation_20101208_newramp.vi ‏131 KB