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This procedure covers the interpretation of interference fringe patterns generated by either an Optical Flat or a Flatness Interferometer for the purpose of measuring flatness. 2.
This procedure covers the interpretation of interference fringe patterns generated by either an Optical Flat or a Flatness Interferometer for the purpose of measuring flatness. 2. Fringe lines can be thought of lines on a topographical map, but instead of elevation, they represent lines of equal distance between a reference surface such as an ...
Basic Interference and Classes of Interferometers - James C. Wyant Page 3 Optics 505 - James C. Wyant Page 5 of 26 Fringe Spacing I =I 1 +I 2 +2 I 1I 2(a ˆ1 ⋅a ˆ 2 )cos()α1−α2 ∆y = λ sinθ1−sinθ2 Straight equi-spaced fringes
2 sie 2016 · A dark fringe is produced where the dark lines are out of step one-half period, and a bright fringe is produced where the dark lines for one grating fall on top of the corresponding dark lines for the second grating.
camera has small aperture focused on film. if θ ≈ 0, cosθ≈1 for moderate spread in θ. constant. If d>>λ,m varies greatly for change in λ. If d = few λ, m varies slowly with λ. Therefore, with thin films see color fringes. Color changes with variations in thickness and θ.
Figure 5: The localized fringe interference patterns produced by a Michelson interferometer: (a) and (c) are depictions of curved fringes, implying the mirror is far from the region of zero path difference, and (b) shows straight, parallel fringes — this must be at or very near the point of zero path difference.
Interferometric optical testing is based on the phenom-ena of interference. Two-beam interference is the super-position of two waves, such as the disturbance of the sur-face of a pond by a small rock encountering a similar pat-tern from a second rock.
