Optical tomographic image obtaining apparatus

Details Optical tomographic image obtaining apparatus Optical tomographic image obtaining apparatus

2008-01-29

2008-01-29

Lyons, Michael A. (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S479000

Reexamination Certificate

active

07324211

ABSTRACT:
An optical tomographic image obtaining apparatus, capable of obtaining optical tomographic images at high resolution, is miniaturized. During obtainment of an optical tomographic image, a mirror rotating section rotates a mirror, to rotate the irradiation direction of a measuring light beam. Operations of an optical path length changing section are controlled such that a measurement point along the optical path direction is moved for every rotation of the irradiation direction. A sheath rotating section rotates a sheath to move the position of a lens fixed within a lens holder by a threaded mechanism, to move the focusing position of the measuring light beam in the optical path direction, to match the position of the measurement point. Therefore, the movement speed of the focusing position can be reduced compared to conventional apparatuses. Accordingly, the necessity of a large focusing position moving means, which is capable of high speed movement, is obviated.

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Andrew M. Rollins, et al., “Real-time in vivo imaging of human gastrointestinal ultrastructure by use of endoscopic optical coherence tomography with a novel efficient interferometer design”, Optics Letters, vol. 24, No. 19, pp. 1358-1360, Oct. 1, 1999.

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