Phase measurement using an interferometer having a filamentary spatial filter and an extended source of polychromatic light.
The theory of phase measurement by means of the interferometer using a filamentary spatial filter (IFSF) is extended to the case in which the source has finite width. Experimental results satisfactorily coincide with theoretically obtained characteristics. The examination of accuracy suggests that the error in phi/2pi can be easily restricted to within 0.01. It is hoped that the IFSF will improve efficiencies in the measurement of dispersive power of a fluid and the method of coincidence being used in the measurement of a distance between reflecting surfaces, because it can simultaneously measure phases in various wavelengths if a polychrometer is set in the rear of the image plane.
Mori
S
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Department of Aeronautical Engineering, College of Engineering, University of Osaka Prefecture, Mozu-Umemachi, Sakai 591, Japan.