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record a spectral shift over time
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on Mar 25, 2012
on Mar 26, 2012 by mkelly
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I want to record an interference peak shifting over time for my sensor's response time.
How can I record the response time using OSA Agilent 86140B?
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Mar 26, 2012 12:25 AM
It looks like you'll want to do this with a remote program to take the measurements at the desired time intervals and record the values.
For this you'll probably want to disable continuous triggering and then start the individual measurement sweeps with your program, as with these two commands:
OUTPUT @Osa;"init:cont off" ! turn repeat sweep mode off
OUTPUT @Osa;"init:imm" ! initiate a single sweep
The second command can be used for each measurement. Either the trace itself could then be stored or for example a peak marker could be used to locate the peak and then the value can be read out.
OUTPUT @Osa;"calc:mark1:max" ! set marker one to max
Another idea: If a faster update is needed than can be obtained with the repeated scans and readings, an alternative is to set the OSA to "zero span" by setting the span parameter to zero with the wavelength set to the flank of your peak. Then the trace will show the time dependence of the signal at this wavelength and will move up or down if the peak moves to lower or higher wavelength.
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