APPLICATION OF A DIGITAL PHASE COMPARATOR TECHNIQUE TO INTERFEROMETERDATA

Substantial improvements have been made to increase the frequency band width of the UCLA multichannel interferometer system on TEXT-Upgrade. Recently, a digital phase comparator technique was implemented that ha s several advantages over the conventional analog phase comparator. Th e probe and reference wave forms are directly digitized and the phase computed in software using a numerical demodulation algorithm. For the purpose of reducing the data load, aliasing of the laser difference f requency is employed to vary the time response according to experiment al demands. (C) 1997 American Institute of Physics.