Jenoptik Aktiengesellschaft

Jenoptik Gmbh

Steffen Goerlich

Wolfgang Ecke

Siegfried Belke

Klaus Moehr

Norbert Klose

Peter Voigt

Joachim Wieser

Wolfgang Merker

An arrangement for simultaneous optical determination of temperature and strain fluctuations in an optical fiber for precisely determining the changes in environmental influences and/or fiber loads is disclosed. The arrangement performs two different measurement tasks of the absolute measurement of a stationary quantity, such as temperature and the relative, high-resolution measurement of quickly varying quantities of fluctuation processes with comparable accuracy in a single optical The arrangement which is achieved using a spectrometer with an imaging, spectrally dispersive element, a first input light bundle being arranged with reference to the dispersive element such that the light spectrally dispersed at the dispersive element is projected onto a first linear receiver The arrangement, and an additional second input light bundle is directed onto the dispersive element in the spectrometer, whose spectrally dispersed light falls onto a second linear receiver The arrangement, parallel to the first one, the two input light bundles are fed light from a broadband light source which has been reflected by at least two optical fiber gratings with different mean wavelengths, and an interferometer The arrangement with phase modulation and different arm lengths is present at least in the light path of the second input light bundle upstream of the spectral dispersion by means of the dispersive element, whose evaluation is performed via the second receiver. The arrangement by means of phase modulation modules with reference to relative changes in the Bragg wavelengths, while a CCD evaluation module for determining the absolute Bragg wavelengths of the optical fiber gratings is arranged downstream of the first receiver The arrangement.

Bragg grating temperature/strain fiber sensor having combination

A method and arrangements for determining an at least approximately circular contacting surface is disclosed. The primary object of finding a simple way of objectively determining the contacting surface of a deformable medium on a plane surface with high accuracy and at a low technical expense is met according to the invention in that a film waveguide is used as a plane surface. An incoherent, parallel, homogeneous bundle of light whose width widens one-dimensionally is coupled into this film waveguide and the decoupled light is fed to a photoreceiver array for recording one-dimensional intensity distributions. An evaluating unit generates a difference curve from a normal curve without contacting medium and from a measurement curve with contacting medium and the exact diameter of the contacting surface is determined from the distance of two associated extremes of the difference curve. The method and arrangements are preferably used in ophthalmology for the measurement of the applanation circle at the tonometer and for measuring liquid drops for the purpose of analysis.

Method and arrangement for determining an at least approximately

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Jena, Germany

Steffen Goerlich