Methods and arrangement for increasing contrast in optical coher

Details Methods and arrangement for increasing contrast in optical coher Methods and arrangement for increasing contrast in optical coher

1997-05-14

1999-03-02

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, 356357, G01B 902

Patent

active

058778560

ABSTRACT:
In optical coherence tomography, a sectional image I(x,z) of an object is obtained in that a light beam scans the object along a x-line on the surface, and the depth z from which light of intensity I is reflected is measured by means of a partial-coherence interferometer. In so doing, a strong medium intensity can cover and conceal small differences in adjacent object points. The invention renders small differences in adjacent object points visible in that the object is illuminated by a dual beam which simultaneously illuminates the object at two adjacent points and whose two components are in opposite phase after traversing the arrangement, so that they cancel one another in a homogeneous object structure. On the other hand, if changes are brought about in the two light bundles by means of the reflectance at the object structure, they do not cancel one another, but rather produce an image signal.

REFERENCES:
"Optical Coherence Tomography", Huang et al, Science, Nov. 1991, pp. 1178-1181.

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