Increasing the sensitivity for tilt measurement using a cyclic interferometer with multiple reflections
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Cites methods from "Increasing the sensitivity for tilt..."
...Various angular measurement methods have been proposed, such as autocollimator [14,15], interferometer [16,17], visual measurement [18,19], and one composed of both the interferometer and autocollimator methods [20]....
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Cites background or methods from "Increasing the sensitivity for tilt..."
...The relationship between the distance between the two mirrors (d), the length of Mirror 3 (L), the incident angle (θ) and the number of reflections (N) is as follows [10]....
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...It has been shown that the cyclic path interferometer with multiple reflections can be used to measure tilt angles below 5 μrad [10]....
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...2 Schematic of the Cyclic path interferometer with multiple reflections [10]....
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...The previous work [10], used another method by assuming that the fringes formed are of unit visibility cosine squared (cos(2)) plot was fit to the fringes and the phase was extracted....
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...In this setup, when the interferometer is rotated, a phase difference is introduced between the two laterally sheared beams, which are then used to measure the rotation [10]....
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References
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"Increasing the sensitivity for tilt..." refers methods in this paper
...An interesting and alternate method that is interferometric in nature uses the two parallel sides of a thick glass plate called the Murty shear plate for the measurement of tilt.(8) The method looks at the slope of the wavefront and therefore is somewhat less sensitive to external vibrations and turbulence but the sensitivity is low....
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