11.23.10

Many re-installations, a new software version, much cursing, and a birthday later, I finally have everything (relatively) working with the WFS. Frame rates at the ~260x260px resolution I'm using now are around 250-300 fps, but for some reason in Matlab I'm limited to a mere 30-40. The external trigger guarantees that each frame is fresh though, so this is still an order of magnitude faster than before with that ridiculous artificial pause. I suspect the frame rate problem has to do with the bytes per packet, which I can't seem to change from Matlab directly.

Anyway, at the moment that's a minor problem. This new speed means that generating a poke matrix only takes around 10 seconds. Here's an example after a few realignments:

Recall that I'm now doing differential measurements . I've tried to correct for the bias WF as much as possible, but its no a pure focus so moving lenses around won't completely obliterate it. Surprisingly, most of the modes are recognizable on the 9x9 measurement grid. For comparison, here are the ideal mode shapes resized to that grid from an original 128x128 image:


Most of them look pretty good, and the higher frequency ones might still be usable. The next step is mapping disturbances on the DM. Right now I'm trying to work out a more systematic way of doing that instead of just blindly using the reconstructor matrix. I'm thinking that projecting the desired WF onto a set of modes, other than the DM modes for the 61 actuator mirror, might be useful for this purpose. Maybe PCA modes from the original data or SVD modes of the DM.