At NPOI, a fringe frame is a two-dimensional array of count rates, whereby one
dimension corresponds to the 8 or 64 phase bins across the fringe, and the other
dimension corresponds to the channel axis. A frame is recorded every 2 ms.
The frames are stored
in bincounts, which can have dimensions, in this order, of the
number of spectrometers,
number of bins, number of channels, and the
number of frames. This structure is the same
whether or not one is using the 3 or 6 way beam combiners. All COBRA functions
are guaranteed to work if a single spectrometer is selected; only a few accept
frame or visibility variables with a spectrometer index, as noted specifically
below. Therefore, the default
is that the bincounts array does not have a spectrometer index.
Display frames on the TV. Any index selections in the different dimensions can be displayed, provided all phase bins are always selected. Examples: displayframe,bincounts(0,*,*,0), displayframe,bincounts(0,*,0,0:99).rotateframe(c, l, a, g)
Function. Apply rotation by group delay and airpath to fringe frame and return rotated frame.fringeframe(a, g, l, v, n[, /poisson])
Function. Return a simulated fringe frame for a given path in air, , delay tracking offset (group delay), , wavelength grid, , visibility amplitude, , and photonrate, . Optionally include Poisson noise. and can be arrays, as well as and . The number of bins is inferred from the genconfig.numbin variable. The default number of bins is 8.