Abstract
The use of interferometric fringe density, derived by double-exposure holography, to measure changes in the tilt of an object is studied. The tilts of a precision mirror tilter were measured using the optical-lever method and double-exposure holograms. The fringe densities and angles of tilt are examined and compared; good correlation between the values is obtained. It is noted that the laser-holographic method is effective for measuring tilts because it is a noncontact method, it uses advanced methods of fringe counting, and tilt can be measured at any point; however, it does not provide direction of tilt and for tilts greater than 120 sec the fringe density is too large for resolution.
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