I'm working on a lab for school and I need a little help figuring out how to find the characteristic time for the FID. I have two signals: one looks like a sine function and the other a cosine function. They are each inside a decaying envelope (exp(-t/T)).
How do I determine T from the graph? Is it possible to use a Fourrier Transform?
2007-01-17 21:07:19 · 1 answers · asked by Ian 2 in Science & Mathematics ➔ Physics
The time taken for the envelope amplitude to decay to 1/e of its value is the time constant. This is true for any position on your graph.
Measure the amplitude of the envelope near the beginning of the trace.
Divide it by 'e = 2.718'
Identify where this amplitude exists later in the trace.
The distance is the decay time of the signal.
I hope that I haven't completely missed the kernel of your question.
2007-01-21 10:21:35 · answer #1 · answered by Rufus Cat 4 · 0⤊ 0⤋