| 摘要 |
The method is used in determining the shape of real large-format objects in the construction and mechanical engineering industries, and serves to improve the accuracy with which the coordinates of points on a measured surface can be determined. This method involves recording double-exposure holograms of one or more reference objects on an unspecified photosensitive material using a set of spatially separated light sources and reference light beams. The restored interference pattern is then compared against the interference pattern generated while the object under study is simultaneously illuminated by a single source with spatially separated light beams. The total interference pattern is then digitised and processed with various values of the phase shifts between the objects being illuminated and the hologram restored using the light beams. There are at least five independent phase shift combinations between 0 and 2 radians, with the most appropriate values corresponding to the beams with 0, π/2, and 3π/2 radians.<IMAGE>
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