Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Boehringer Mannheim Gmbh

Dragerwerk Aktiengesellschaft

Ceramoptec Industries, Inc.

Alfill Getranketechnik Gmbh

Bernhard Schrader

Dietrich W Lubbers

Norbert Opitz

Dirk Bocker

Elmar Schmidt

Jurgen Backhaus

Hans-Ulrich Menzebach

Raimund Wyzgol

Wolfgang Schrader

Petra Heinrich

Gunter G Hoffmann

A device for the in vivo determination of an optical property of the aqueous humor in the anterior chamber of the eye includes a light source to irradiate light along a primary-side light path into the anterior chamber of an eye. A detector is provided, in order to detect light issuing from the anterior chamber along a secondary-side light path. A signal processing unit is provided to determine the optical properties on the basis of the measured signal of the detector. A routine in vivo examination of the aqueous humor of the eye, with minor inconvenience to the patient, can be achieved due to the fact that the device can be easily positioned in front of the eye. The central rays of the primary-side light path and of the secondary-side light path form, with the normals to surface of the cornea bordering the anterior chamber, an angle (.alpha., .beta.) such that the detector detects light reflected from the front interface of the eye lens.

Device for the in vivo determination of an optical property of the

A method of optically measuring volatile impurities in contaminated medium using a combination of a distillation process with head space analysis. The method uses a hydrophobic extracting membrane at the surface of an internal reflection element (an optical fiber or an attenuated total reflection crystal). The hydrophobic analytes are extracted into the extracting membrane, from the contaminated medium. By heating the contaminated medium to form a vapor and cooling the sensor element surrounded by the extracting membrane this invention significantly reduces the limit of detection by between two and three orders of magnitude from the prior art. The distillation aspect of the method also serves to protect the extracting membrane surrounding the sensor from damage by the mechanical impurities in the contaminated medium. A simultaneous continuous analysis of several impurities of the contaminated medium is possible by several optical fibers arranged in parallel on the same cooling device, each of which is designed for another contaminate by means of optical filters, wavelengths disperging elements (gratings or prisms) or wavelength selective IR sources or detectors.

Method for continuous determination of volatile impurities in

Light-transmitting plastic and/or glass bottles are tested at a station where selected portions of their internal surfaces scatter radiation issuing from a beam of monochromatic radiation. The scattered radiation is intercepted and monitored for the generation of signals which denote the presence or absence of impurities on the selected portions of the internal surfaces and/or certain substances in the walls adjacent the selected portions of the internal surfaces of tested bottles. Such signals are processed, and the processed signals are utilized to classify the bottles according to their defects and/or to segregate unsatisfactory bottles from acceptable bottles and/or to segregate glass bottles from plastic bottles and/or to classify satisfactory plastic bottles in accordance with the nature of their plastic materials. The scattered radiation can constitute Raman, Rayleigh and/or fluorescence radiation.

Method of and apparatus for optically testing radiation transmitting

An arrangement for optical measuring concentration of substances has a measuring space which is composed of a material selectively permeable for particles to be measured, acting back on the particles and transparent for a measuring radiation, and a measuring space is arranged in working connection with the object to be measured and the measuring radiation passes through the measuring space. The measuring space has a layer that is a water-insoluble solvent or made of poly(ethylene terephthalate) or polytetrafluoroethylene. The layer excludes a reaction from the particles to be measured.

Arrangement for optical measuring of concentration of substances

The invention relates to an arrangement for measuring the concentration of gaseous and/or vaporous components of a fluid mixture by means of light absorption such as by means of an infrared absorption by utilizing a membrane which is made of a material in which the component of the fluid mixture to be measured accumulates. The membrane is transparent to the measuring radiation and is selectively permeable for the particles of the compounds to be measured. The membrane further acts on the radiation path between the light source and the detector. The arrangement is improved with respect to selectivity and the detection sensitivity. This is achieved in that the membrane is mounted in the flow path of the fluid mixture such that the flow path is subdivided into two component paths at the surfaces of the membrane.

Arrangement for measuring the concentration of gaseous and vaporous

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Essen, Germany

Bernhard Schrader