hello
i was getting signals from sensor. to wipe off the effect of noise on
the result, i have set threshold level. what i need to do is to get the
area under the 2 curve(shown in the attached diagram, with the
threshold level is shown). setting the threshold level, i am able to
get 4 instant time/ index by using basic level trigger vi. i then use
this 4 value to get dt (dt1=t2-t1, dt2=t4-t3). with both curves
initial time is t1 and t3, using the extraction portion of signal vi to
extract the signal with given initial time and dt(shown in diagram 2).
what my question is after extracting the signal, the baseline is based
on the threshold value i set in the 'basic level trigger' vi?or it just
instead of the value of zero ?
it is because after extracting signal, i will need to carry the numeric
integration.(i used simpson rule). the numeric integration vi is
integrating to get the area from the baseline (either zero or
starts from the threshold ? value)
however, remembering that i need to get the area under the curves. what
i get is only the small portion of curve, how am i going to get the
remaining portion(the portion starts from baseline to the threshold
level in the curve) to carry the integration?is any vi in labview will
help this?i read about the messages posted in forum. but i was
thinking that the method of getting area under the curve which i did
was wrong. . did i?i doubt
(remark: the diagram at the right is the extraction portion of signal from the first curve)
anyone pls help.
thanks
regards
