I shine a laser to the micro-bridge and apply AC signal to electrically actuated the micro-bridge. I then use the reflection of the laser light to determine if it's resonant. If the reflection of laser spot becomes wider, then I would say the micro-bridge is in resonance. However, this method can't tell me which mode I am seeing. Is there any way that I can know the modes?
Thank you.
2006-12-29 11:54:23 · 2 answers · asked by Richard 1 in Science & Mathematics ➔ Engineering
Would the lowest frequency at which this occurs be the primary mode? The other resonance frequencies should be multiples of that?
2006-12-29 13:27:48 · answer #1 · answered by rscanner 6 · 0⤊ 0⤋
What you're going to have to do is scan the micro-bridge through a range of frequencies. The 1f will have a larger magnitude than the 2f, 3f, etc.. Once you pick out the fundamental, you can count, visually, the modes as you modify the micro-bridge excitation signal.
2006-12-30 01:21:51 · answer #2 · answered by forrestoff 2 · 0⤊ 0⤋