I'm not sure its the neatest of methods, but I've finally got there... I've attached the code, but again, it includes laser control so it's not directly runnable.
The way I've solved it is as follows: I used the digital line from the laser as a "pause trigger" to pause a continuous analogue acquisition on channel AI0 when the digital signal is low (this is the firs daq task in the diagram). The 2nd daq task sets up a counter using the digital output from the laser and an internal clock (the AI sample clock) to produce a "time reference" for each AI sample. Finally, I used a second counter (again connected to the digital output from the laser) to count the cycles of the digital signal (i.e. the laser channels).
When run, this gives me two 1D arrays. One containing the AI samples and one containing the number of clock ticks since the start of the acquisition for each AI sample. I then use the fact that there's a gap in the reference time when the digital signal from the laser is low to "filter" the data (i.e. take the average of each subset of data corresponding to one "high" period on the laser's digital signal), ending up with a single array of data containing a single measurement for each laser wavelength!
As I said, I'm not sure if its the neatest or most efficient, but it does solve the problem! If you can see anywhere I can improve this then I'd be glad to hear it!
Thanks for your help and support!
Paul
Message Edited by psmorris on
06-04-2008 09:47 AM
