1. Thomas Hellmuth

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    1. Mentioned In 11 Articles

    2. Spatial Imaging with Wavefront Coding and Optical Coherence Tomography (Book Chapter)

      Spatial Imaging with Wavefront Coding and Optical Coherence Tomography (Book Chapter)
      With wavefront coding the wavefront in the pupil plane of an optical imaging system is modified by introducing a phasemask. The resulting image intensity distribution is processed with an inverse digital filter providing an image of the object with enhanced depth of focus. Optical coherence tomography provides three-dimensional information about the object. The depth resolution is only determined by the coherence length of the light source. New applications and methods ...
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    3. 3-dimensional scanning of grinded optical surfaces based on optical coherence tomography

      T. Hellmuth, R. Borret, and K. Khrennikov In the manufacturing process of aspheric glass lenses the grinding step plays a key role both in respect of the final quality of the polished lens as well as in respect of manufacturing costs. Therefore, the form of the grinded surface must be measured with high precision. The typically used tactile ... [Proc. SPIE Int. Soc. Opt. Eng. 6671, 66710X (2007)] published Fri Sep ...
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      Mentions: Thomas Hellmuth
    4. System for measuring the optical image quality of an eye in a contactless manner

      A system is used for contactless measurement of the optical imaging quality of an eye with an interferometer by which at least one light pulse with a short coherence length is coupled into the eye from a light source. The optical path length of at least one arm of the interferometer is varied for measuring the length of the eye until a typical interference pattern between a reflection of the ...
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    5. Optical coherence tomography assisted surgical apparatus

      Ophthalmologic surgical microscope which is combined internally with an optical coherence tomography ("OCT") apparatus wherein auto-focusing is provided by driving a motorized internal focusing lens of the ophthalmologic surgical microscope with a signal output from the OCT apparatus. An embodiment of the inventive ophthalmologic surgical microscope includes: (a) an optical coherence tomography ("OCT") apparatus; (b) a beamcombiner for internally coupling output from the OCT apparatus into the ophthalmologic surgical microscope ...
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    6. Method and apparatus for simultaneously measuring the length and refractive error of an eye

      Embodiments of the present invention are method and apparatus for simultaneously measuring the length and refractive error of an eye, preferably in a non-contact mode. In particular, an embodiment of the present invention is an apparatus which measures length and refractive error of an eye which includes: (a) a source of short coherence radiation which couples radiation into a Michelson interferometer, the arms of the Michelson interferometer having a predetermined ...
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    7. OCT-assisted surgical microscope with multi-coordinate manipulator

      Embodiments of the present invention provide method and apparatus for use during a neurosurgical procedure to enable a multi-coordinate manipulator ("MCM") to locate blood vessels and nerves in a patient's brain with submillimeter resolution. In addition, embodiments of the present invention provide method and apparatus for mapping oxygenation of brain tissue in three dimensions to differentiate tumor tissue from normal brain tissue with submillimeter resolution.
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    8. Fundus illumination apparatus formed from three, separated radiation path systems

      Apparatus for illuminating the fundus of an eye with a scanned sample beam of radiation. An embodiment of the present invention is an optical system which includes three, separated radiation path systems--a tilted illumination path system, a decentered observation path system, and an optical path system--which are combined by a beamsplitter into an ocular lens. In accordance with the present invention, an illuminating path provided by the illumination path system ...
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    9. Short coherence length, doppler velocimetry system

      Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a principal wavelength, which radiation is substantially spatially coherent and has a temporal coherence length which is less than 1 picosecond; (b) a beam splitter for splitting the beam into a sample beam and reference beam; (c) optical apparatus ...
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    10. Optical coherence tomography assisted ophthalmologic surgical microscope

      Ophthalmologic surgical microscope which is combined internally with an optical coherence tomography ("OCT") apparatus wherein auto-focusing is provided by driving a motorized internal focusing lens of the ophthalmologic surgical microscope with a signal output from the OCT apparatus. An embodiment of the inventive ophthalmologic surgical microscope includes: (a) an optical coherence tomography ("OCT") apparatus; (b) a beamcombiner for internally coupling output from the OCT apparatus into the ophthalmologic surgical microscope ...
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    11. Optical coherence tomography corneal mapping apparatus

      Optical coherence tomography ("OCT") corneal mapping apparatus includes an OCT apparatus having a rotating helical mirror for altering a reference beam path in the OCT apparatus; a raster scanner for raster scanning sampling optical output from the OCT apparatus; a curved mirror for transferring the sampling optical output from the raster scanner to an eye and for transferring sampling optical output reflected from the eye back to the OCT apparatus ...
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    12. Measurement of lens characteristics

      Method and apparatus for measuring the following lens characteristics: (a) curvature of the front and back surfaces of the lens; (b) physical thickness; and (c) index of refraction of the lens to determine the front vertex power, back vertex power; and the lens material. In particular, an embodiment of one aspect of the present invention for measuring the index of refraction of the glass includes: (a) a source of a ...
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    13. 1-11 of 11
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  2. About Thomas Hellmuth

    Thomas Hellmuth

    Thomas Hellmuth is in the Department of Optoelectronics at Aalen University of Applied Science in Germany.