Abstract: Disclosed is a process and measurement device for noninvasive determination of venous and arterial blood pressure in the arteries of the human body, particularly in the finger and toes. An occlusion band and peripherally thereto a sensor for the detection of changes in the blood volume during the pressure-buildup procedure is attached in these measurement areas. The present invention is distinguished by the pressure-buildup procedure being characterizied by a slow, preferably linear increase in air pressure in the occlusion band and the blood pressure values being determined from the change in the blood volume signal and the respective current occlusion pressure. It is possible for the first time to determine the venous pressure, the arterial diastolic pressure and the arterial systolic pressure bloodlessly during a single measurement test.

Abstract: 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.

Abstract: A magneto-optical waveguide device for changing the radiation modes propagating in the structure comprises a magneto-optical layer in which the modes propagate and which is externally magnetized. This magneto-optical layer is carried by a substrate and is connected to an optically anisotropic structure. This optically anisotropic structure is an artificially formed phase structure having zones of different refractive indices, the zones and their distances from each other in the direction of propagation of the modes being small relative to the wavelength of the light.

Abstract: 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.

Abstract: The record carrier according to the invention comprises a substrate on which an electrode is provided which, on the side remote from the substrate, has a low-ohmic photoconductive layer which is covered with a second transparent electrode which is provided wihh a thermoplastic layer. For storing information the electrodes are connected to a voltage source and the thermoplastic layer is charged electrostatically and exposed in known manner. Upon exposure of an area of the thermoplastic layer, the light will fall through the transparent electrode on the low-ohmic photoconductive layer. As a result of the current passage, Joulean heat is produced which heats the thermoplastic layer in the place of the exposed area and softens it thereby deforming the layer by electrostatic forces in accordance with the charge.The thermoplastic layer may, in known manner, also have photoconductive properties or be provided with a further photoconductive layer.

Abstract: A method for the measurement of the aggregation rate of particles suspended in a liquid, particularly of red blood corpuscles in the blood by measuring the intensity of a light beam impinging on the blood sample and leaving the sample again, wherein said blood sample is arranged in a disc cuvette in the horizontal beam path of a light source and is subjected to a shear movement during the course of the measurement of the light beam leaving the sample, and an apparatus for carrying out this measurement.