Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Reexamination Certificate
2011-04-26
2011-04-26
Toatley, Gregory J (Department: 2877)
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
Reexamination Certificate
active
07933003
ABSTRACT:
A method of studying a surface using an interferometer, in which there is relative motion between the surface and the interferometer, the motion having a total velocity Vtotwhich includes a transversal or traversing component Vtand a longitudinal component Vl. The method comprises: directing an object beam of coherent light to a measurement position at the surface, whereby there is relative motion between the surface and the measurement position; arranging an array of detectors on the interferometer in a line extending generally in the transversal direction, the detectors being arranged to detect light rays with different angular directions, representing different sensitivity directions; producing a reference beam of coherent light which is coherent with the abject beam; combining the reference beam with the reflected object beam from the surface to produce a cross interference in the speckle pattern providing information about the relative motion of the surface and the interferometer; detecting the speckle pattern and the cross interference pattern with the detectors; determining which detector in the array has zero or minimum sensitivity to the total velocity Vtotof the motion, thereby identifying the detector with a sensitivity direction line that is normal to Vtot; monitoring the temporal change in which of the detectors has zero or minimum sensitivity, thereby ascertaining the change in direction of Vtotover time, brought about by changes in Vl: and determining temporal changes in Vt.
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Meldahl Paul
Vikhagen Eiolf
Patterson Thuente Christensen Pedersen , P.A.
Richey Scott M
Statoil ASA
Toatley Gregory J
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