Heidelberg Engineering Gmbh

Björn Martensen

Ralf Engelhardt

Silke Aumann

Lisa Kutzner

Andreas Fritz

Boy Braaf

Gerit DRÖGE

The invention relates to an assembly comprising a interferometer for carrying out an optical coherence tomography, wherein the interferometer is divided into two spatially spaced-apart interferometer parts (), wherein the two interferometer parts () can be moved related to one another and are optically connected to one another via flexible light guides (), which bridge the spatial distance, wherein according to the invention, an assembly having an interferometer is provided, which is as unsusceptible as possible to the effects brought about by bending a tube cable packet and allows for an optimum signal-to-noise ratio or an optimum image quality of an OCT image, characterised in that at least one first flexible light guide () is designed as a polarisation-maintaining light guide consisting of two connected polarisation-maintaining light-guiding fibres ().

Assembly for carrying out an optical coherence tomography

The invention relates to a method for signal processing in optical coherence tomography by means of a tunable light source (swept source), comprising the following steps: tuning the light source and sensing a signal intensity of the light source in linear dependence on the respective wave number (k) of the tunable light source and producing a signal intensity distribution in dependence on k; applying a window function to the sensed signal intensity distribution and producing a weighted signal intensity distribution; and applying a fast Fourier transform (FFT) to the weighted signal intensity distribution; and characterized in that, in the tuning of the light source, the tuned frequency spectrum is limited to a passband of the window function.

Method for signal processing in optical coherence tomography by means of a tunable light source

A system for detecting position data of an element in the front region of an eye. A first system component continuously detects position changes of the vertex of the cornea of the eye. A second system component directs electromagnetic radiation at topographical structures of the cornea to be ascertained or modified. A control unit includes a processor and memory. Alignment of the first system component with respect to the alignment of the second system component is defined, and the second system component is continuously guided to the respective target position thereof, by the control unit based on the position changes detected by the first system component. Light sources, which illuminate the cornea, are symmetrically disposed around the main axis of the system so that a pattern of reflection points is created on the cornea. The processor determines the current position of the vertex as the center of the reflection points.

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Lübeck, Germany

Björn Martensen