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- W2317221105 abstract "It is shown that a higher accuracy in measurement of optical path difference between two domains than conventional techniques can be obtained by a double diffraction interferometer. The interferometer consists of similar components to a Schlieren system but contains a fine wire instead of a knife edge. The object space is occupied by a test brock which is made up of three chambers between two optical flats. Optical path difference is given by adjusting air pressure in one of them. Light intensity is measured by a photomultiplier tube behind a pinhole in an opaque plate at the image plane. When the wire is travelled along optical axis, the intensity varies in various manner that depends on fractional part of the ratio of the optical path difference to the wave length. Because the relations among the fractional part, position of the wire and the intensity can be theoretically found, the former one may be deduced from measured results of the latter two. Experimental results show that observation error of the fractional part in the new technique can be restricted within 0.02." @default.
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- W2317221105 date "1978-01-01" @default.
- W2317221105 modified "2023-09-26" @default.
- W2317221105 title "Measurement of Optical Path Difference by Means of the Double Diffraction Interferometer" @default.
- W2317221105 doi "https://doi.org/10.2493/jjspe1933.44.142" @default.
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