| 摘要 |
An instrument for studying an object ( 12 ) comprising a movable interferometer having a laser source and a plurality of detectors ( 24 ) arranged in an array. The laser source is expanded and arranged to direct a converging object beam ( 21 ) towards a point ( 22 ) or line beyond the object ( 12 ) whereby a speckle pattern of light reflected from the object ( 12 ) is detected by the detector or detector array ( 24 ). The point ( 12 ) or line at which the laser source is arranged to converge the object beam ( 21 ) is approximately the same distance beyond the object ( 12 ) as the object is spaced from the source. The speed of movement of the instrument, the sampling rate of the detectors ( 24 ) and size of the area ( 23 ) of the object illuminated by the converging laser object beam ( 21 ) are arranged so that sequential areas ( 23 ) of the object ( 12 ) studied overlap.
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