While high-sensitivity moire interferometry requires monochromatic light, an auxiliary compensator grating removes the requirement. Experimental verification utilized white light for moir6 interference of sensitivity 0.83:3 Atm/fringe. Configurations readily amenable to compensation include moire fringe multiplication by even factors and the minimum-deviation arrangement. Chromatic compensation is effective with virtual reference gratings as well as real reference gratings; in both cases the

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... r6 interference system becomes achromatic. Compensation provides the special quality of nearly zero phase difference-an actual range of +7r-between interfering beams. Potential applications include use of electrical spark light sources for high-sensitivity dynamic moire photography.