U.S. Philips Corporation

Fa. Nattermann Arzneimittel Gmbh

Fa Nattermann Arneimittel Gmbh

Blazek, Vladimir

Vladimir Blazek

Hans J Schmitt

Hans-Jurgen Schmitt

Joachim J Noll

Jurgen Seidenberg

Claudia R Blazek

A measuring apparatus for the noninvasive determination of peripheral outflow and flow disturbances in the extremities of human beings includes at least one light transmitter for directing light onto the skin of a human subject and at least one light receiver for receiving reflected light as well as an evaluation and read-out circuit to ascertain the temporal course of blood outflow or inflow in the veins by measuring the changes in the reflected light. The evaluation and read-out circuit calibrates itself prior to measuring by raising the current flowing through the light transmitter or transmitters until the signal-to-noise ratio of the receiver has attained a specific value.

Microprocessor controlled apparatus for the noninvasive determination of

A rapid and simple opto-electronic measuring method of determining the wavelength and the wavelength-corrected power of monochromatic light sources is indicated. The photodetectors (1, 2) of different spectral overall sensitivity are acted upon through a transfer device by the flow of radiation of the light source to be measured, and the signals (I1, I2) then produced are supplied through a unit (3) for acquisitioning and processing the measurement values to a calculation unit (4). From the signals (I1, I2) a wavelength-specific quantity is derived in the calculation unit which is compared with the wavelength-specific data present in memory unit (6) after one calibration. Thus, the actual wavelength of the light source to be measured can be determined, be indicated by an indicator unit (7), or be supplied through a data interface. When the actual wavelength is known, a wavelengh-specific correction factor can be interrogated in the memory unit, and a wavelength-corrected power can be calculated in the calculation unit. FOr actuation of the photodetectors (1, 2), a radiation splitter, light wave guides with corresponding connection members of Ulbricht balls can be used.

Method and apparatus for determining radiation wavelengths and

The invention relates to an arrangement of inspecting light waveguide end faces by observing the interference pattern formed by means of measuring light in the airgap between a plane transparent plate and the end face of a light waveguide abutting on said plate. A less elaborate measuring device requiring less space is obtained in that the measuring light is led towards the end faces to be observed, via the light waveguides (1, 2, 23, 24).

Arrangement for inspecting light waveguide end faces

A measuring apparatus for the noninvasive determination of peripheral outflow and flow disturbances in the extremities of human beings includes at least one light transmitter for directing light onto the skin of the subject under test and at least one light receiver for receiving reflected radiation and an evaluation and read-out circuit for ascertaining the temporal course of the blood outflow or inflow in the veins by measuring the changes in light reflection. The evaluation and read-out circuit is provided with a digitally controlled tone generator and an electroacoustic transducer that emits a first signal to indicate readiness of the apparatus to effect measurement, a second succession of tones, the frequency of which follows the changes in the intensity of the light reflection until termination of the blood outflow or inflow, and a third signal which indicates the end of the measuring.

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Aachen, Germany

Vladimir Blazek