Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-06-12
1992-07-28
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356381, 250561, 382 8, G01B 1124
Patent
active
051336014
ABSTRACT:
A method of profiling a rough surface of an object includes moving the object along a z axis so that a highest point of the rough surface is optically aligned with and outside of the focus range of a solid-state imaging array. An interferogram of the rough surface then is produced by means of a two beam interferometer. The solid-state imaging array is operated to scan the rough surface along x and y axes to produce intensity data for each pixel of the solid-state imaging array for a plurality of frames each shifted from the other by a preselected phase difference. The modulation for each pixel is computed from the intensity data. The most recently computed modulation of each pixel is compared with a stored prior value of modulation of that pixel. The prior value is replaced with the most recently computed value if the most recently computed value is greater. The object is incrementally moved a selected distance along the z axis, and the foregoing procedure is repeated until maximum values of modulation and corresponding relative height of the rough surface are obtained and stored for each pixel.
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Brophy Chris P.
Caber Paul J.
Cohen Donald K.
Hoffman Charles R.
Keesee LaCharles P.
Turner Samuel A.
Wyko Corporation
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