Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2006-08-08
2006-08-08
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S512000
Reexamination Certificate
active
07088454
ABSTRACT:
A method of extracting a tomographic image of a layer within a body by optical coherence tomography, involves capturing three images, namely a non-interference background image, a first interference-fringe image of said layer, and a second interference-fringe image phase-shifted relative to the first interference-fringe image. The tomographic image is obtained by mathematically combining the three captured images. In a preferred embodiment random noise is removed by averaging and inter-layer effects are removed by applying a compensation function. This system is then used to extract the 2D cross-sectional images encoded in a multiple-layer information carrier.
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Chang Shoude
Grover Chander P.
Liu Xinping
(Marks & Clerk)
Connolly Patrick
Mitchell Richard J.
National Research Council of Canada
Toatley , Jr. Gregory J.
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