Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2007-06-01
2010-02-23
Lyons, Michael A (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
Reexamination Certificate
active
07667850
ABSTRACT:
An imaging system uses a low coherence light source to image objects at a relatively far distance (at least 10 cm) and/or of a relatively large size (having a dimension of at least 10 cm). An imaging plane is located such that its image path is substantially equal to a reference path that the light follows within the imaging device. The imaging plane has a thickness of about the coherence length of the light. Only light returning from the imaging plane forms part of the image. Light returning on other paths is effectively negated due to a lack of coherence. The imaging plane may be a fixed distance from the imaging system. Alternatively, the imaging plane may be at a variable distance from the imaging system, with the reference path having a changeable length.
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Lyons Michael A
Raytheon Corporation
Renner , Otto, Boisselle & Sklar, LLP
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