A compact, no-moving-parts, dc-phase-measuring interferometer has been designed and manufactured. This interferometer was designed to provide high-density sampling, high-accuracy wavefront measurements under adverse conditions. A crossed grating shearing interferometer technique has been utilized where all data is simultaneously collected on a single fixed detector array. This highly stable configuration provides a means of obtaining phase information using cw, shuttered (1 to 10-3 sec), or ultra-short-pulsed sources. This self-contained instrument can be used to take large numbers of interferograms quickly and reduce their data efficiently to obtain wavefront constructions.