Need help for a post-processing "trigger"

Dear all,
Without getting into much detail, I have a system that is simultaneously introducing a sinusoidal Force (F) and measuring the sinusoidal response (X) of a structure under resonance. I need to acquire the whole time signal, including the free decay response in the end (please find attached a sample picture of the time signal and the corresponding data file), so I cannot use a trigger during the measurement. During the stationary response it may be seen that the signal has a slight negative slope: that is due to a phenomenon of dilatation of my structure that is dissipating heat at the same time.
My problem is how to know exactly when my NI-USB 6216 DAQ has stopped the excitation force, which, in my sample waveform would be around 0.025s (I require an automatic process of identifying it).
Is there any VI, filter or trigger function that might provide me that information?
Thank you in advance for your help.
Kind regards,
Diogo Montalvão
Attachments:
R50_18um_controlo_40_60_temp_24_1_12_v0_time_16.txt ‏373 KB

The brute force method:
Can't you use another analog input channel and capture the excitation voltage?
Or if you have a shaker with an amplifier that provide a current monitor output you can capture the excitation current and might find that due to the voltage control some amount of force is still introduced after setting the control voltage to zero and you might have to implement a system model that include the shaker and the output impedance of your amplifier :0
Greetings from Germany
Henrik
LV since v3.1
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Date: Thu, 13 Oct 2011 08:55:05 -0600
From: [email protected]
To: [email protected]
Subject: I need help for actionscript 3, sending php info to my email, website created in Flash cs5 pro
    Re: I need help for actionscript 3, sending php info to my email, website created in Flash cs5 pro
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