Also, we initially had a mirror set up in a mount,īut that didn't give us any signal. Op-amps tended to burn out, which would cause our circuit not to One of the most prevalent, and most annoying, was the fact that our There were several issues we had when trying to construct this circuit.
Reproduce the sound (more on this later). Then we try and keep the intensity at the detector approximatelyĬonstant.We then need to measure the voltage going to the piezo to To get around this, we designed aįeedback circuit with the mirror glued onto a piezo (with epoxy) and Than a wavelength of light? In this case, we won't be able toĪccurately reproduce the sound. The sound we wish to measure, so if we can measure this variation, we This variation will be at the same frequency as
Phase when they recombine, which creates the interference patterns. As a result, the two beams will probably be out of The two paths cover different distances: d = d sįor the other path. Splitter to the detector, and (2) the path initially reflecting off theīeam splitter, then reflecting off the target, and passing through theīeam splitter to hit the detector. Splitter, reflecting off the top mirror, and reflecting off the beam Laser light: (1) the path proceeding directly through the beam The interferometer compares the relative phase of two paths of the
