Thursday, June 18, 2009

Falling in to an eigenvalue-hole.

So, with Christian here and his banker suit in the closet, we whipped out the matrix-math and writers hats. He was here for the week to help push the 'demodulation' paper forward. If I had to summarize the work it would be something like this - Though typical solar spectropolarimetric systems use achromatized elements for both polarimetric accuracy and precision, there are trade-offs for night-time astronomers that make other solutions attractive. One can remove common night-time systematic effects (beam wander, guiding, ccd gain variations and cosmetics, etc) even with highly chromatic liquid crystal variable retarders and, with careful empirical calibration and a fast-switching detector system, demodulate to a stable polarimetric frame with relatively similar polarimetric sensitivity. Phew. It took two full days of screwing around with data, matrix algebra and a lot of going round in circles (daytime over coffee, night time over whiskey) to get to a point where we both had our heads wrapped around the whole thing. Glad it's done and we can just finish this paper....


Blogger Jesse said...

That second graph is tough to read.

9:08 AM  

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