Phase measurement, traceability, and verification theory and practice

Presently available technology allows the construction of phase calibration equipment with phase resolutions of at least one part in 2/sup 18/, that is, a phase resolution of 0.00137 degrees . The users and the manufacturers of such equipment are faced with the practical problem of verifying their phase accuracy-both relative and absolute-and their traceability to some more accurate source. The authors present measurement methods that allow both relative and absolute high-resolution phase determinations in the vicinity of 0 degrees , 60 degrees , 90 degrees , and 180 degrees angles. They also present practical methods of implementing all of these methods together with comparative experimental data for all of them.<
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