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Archive for May 20th, 2009

Lab Data

A classic science trap, wait for them to look at the spectrometer and pull the stick away.

A classic science trap, wait for them to look at the spectrometer and pull the stick away.

After seven weeks of work we have finally taken real data for our senior lab project.

Normally the class is broken into three week labs (2 for the lab, 1 for the report) but two friends and I are creating a new lab. Yesterday everything finally came together and we could actually hook everything up and get some really nice results.

The hard part of our lab is that it encompasses digital electronics, analog electronics, computer interfacing, frequency space, optics and beam vibrations. If we took a few of these parts out it would be a lot easier but not as satisfying.

What we are doing is using a novel interferometer to measure how far a metal beam is displaced at different resonant modes. The trick bit is that when not at a resonant mode the beam is moving fast and far enough to produce a 500 kHz signal. Getting this 10mV sine wave into a series of binary pulses that can be graphed on a computer is a little bit harder then we initially expected.

But now it works. Seven weeks in we can start doing some physics.

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