We begin by reading a scan's worth of raw data from a HDS file.


Warning(HDS_OPEN): not standard file name!
HDS-file opened; mode=READ.
% Compiled module: POLYFITW.
% Compiled module: STDEV.
GeoParms loaded.
GenConfig loaded.
Scantable created.
% Compiled module: UNIQ.
StarTable created; number of entries = 1.
Finished reading catalogs.
Finished reading catalogs.
Number of new diameters added: 1.
Number of new (R-I) values found: 0.
Finished reading catalogs.
Records loaded.
The fringe data are stored in bincounts. These are the 2 ms count rates for every spectrometer, bin, channel, and frame. At NPOI, there are 3 spectrometers, 8 phase bins across a single fringe, and 32 channels per spectrometer. In this example, there are 42300 frames (2 ms records of fringe data).


BINCOUNTS (RAWDATA) BYTE = Array[3, 8, 32, 42300]
To display a frame, use displayframes. Always select a single spectrometer, and all bins. Select various ranges of channels and frames, and see what happens.




The fringemovie procedure lets you view a movie of the fringe motion!



Let's now introduce the name "channeled" fringe. This term refers to the fact that the fringe pattern is polychromatic. The following command produces an image showing colored fringes.