Abstract: An apparatus for analyzing an element rotating at a rotational speed based on an vibration signal originating from the rotating element has: an analysis function processor for forming a plurality of analysis functions, the analysis function processor configured to form each analysis function based on an analysis frequency, on the vibration signal or on a measured or estimated rotational speed and on a predetermined order factor differing for each analysis function; a correlator configured to calculate a correlation result from the vibration signal and each analysis function, each correlation result being associated to the order factor which the analysis function, with which the correlation result was calculated, is based on, and the correlation results representing a correlation function; and an examiner configured for examining the correlation function or examining information derived from the correlation function so as to make a statement on a state of the rotating element.

Abstract: A method for the spatial tomography of sound includes the following steps: contactlessly capturing a physical parameter for a first and a second multitude of local regions in space along a first and a second laser beam as well as calculating a voxel model of the sound pressure over time per local region of the first and second multitudes based on the captured physical parameter.

Abstract: A device for vibration analysis includes capturing means and evaluating means. The capturing means is configured to capture a pattern from a surface to be measured to provide a captured image of the pattern. The evaluating means is configured to evaluate the captured image in order to obtain, by comparing the captured image with a reference image, an evaluation result including information regarding vibration of the surface to be measured.

Abstract: An apparatus for analyzing an element rotating at a rotational speed based on an vibration signal originating from the rotating element has: an analysis function processor for forming a plurality of analysis functions, the analysis function processor being configured to form each analysis function based on an analysis frequency, on the vibration signal or on a measured or estimated rotational speed and on a predetermined order factor, the predetermined order factor differing for each analysis function; a correlator for calculating a correlation function, the correlator being configured to calculate a correlation result from the vibration signal and each analysis function, each correlation result being associated to the order factor which the analysis function, with which the correlation result was calculated, is based on, and the correlation results representing the correlation function; and an examiner for examining the correlation function or examining information derived from the correlation function so as

Abstract: A method for the spatial tomography of sound includes the following steps: contactlessly capturing a physical parameter for a first and a second multitude of local regions in space along a first and a second laser beam as well as calculating a voxel model of the sound pressure over time per local region of the first and second multitudes based on the captured physical parameter.

Abstract: Embodiments of the present invention provide a memristor having a first electrode, a second electrode and a memristive layer arranged between the first electrode and the second electrode. Thereby, the memristor is adapted to obtain an asymmetrical current density distribution in the memristive layer.

Abstract: A device for detecting momentary sleep is shown. The device includes a video recording device for video-based monitoring of a person and of an eye area of the person, the video recording device being configured to record a sequence of pictures of the person and of the eye area and to output same to a threshold determination device. The threshold determination device is configured to derive one or more thresholds individually adapted to the person from the sequence of pictures. Moreover, the device includes a threshold evaluator configured to decide, on the basis of the one or more individually adapted thresholds, whether or not the person has momentarily fallen asleep, the one or more individually adapted thresholds being utilized for establishing whether or not the thresholds have been passed within the actual time curve of the eye opening and, thus, whether or not the person has momentarily fallen asleep.

Abstract: Embodiments of the present invention provide a memristor having a first electrode, a second electrode and a memristive layer arranged between the first electrode and the second electrode. Thereby, the memristor is adapted to obtain an asymmetrical current density distribution in the memristive layer.

Abstract: The invention relates to a hybrid three-dimensional sensor array, in particular for measuring biological cell assemblies. The sensor array has a plurality of microstructured sensor plates, each having one carrier section on which a plurality of sensor needles are arranged in a comb-like manner, which carry a plurality of electrode surfaces. Furthermore, a plurality of spacer elements are provided, which are fastened between the sensor plates so that both the carrier sections and the sensor needles of adjacent sensor plates are at a distance from each other. The invention further relates to a measuring assembly for measuring electrical activities of biological cell assemblies using such a sensor array.

Abstract: An apparatus for determining information about shape and location of an ellipse involves determining two coordinates of a first ellipse point representing a point of the ellipse located furthest in the first direction, and determining two coordinates of a second ellipse point representing a point of the ellipse located furthest in a direction opposite to the first direction. The apparatus determines parameters of bent line segments approximating the ellipse at ellipse points or in a surrounding of ellipse points, and determines the coordinates of ellipse points based on the parameters of the bent line segments. The apparatus involves calculating ellipse parameters of the ellipse based on the two coordinates of the first ellipse point and the two coordinates of the second ellipse point. The apparatus enables real-time-capable determination of parameters of an ellipse included in an image to be analyzed.

Abstract: The invention is directed to a device and a method for the contactless determination of the actual gaze direction of the human eye. They are applied in examinations of eye movements, in psychophysiological examinations of attentiveness to the environment (e.g., cockpit design), in the design and marketing fields, e.g., advertising, and for determining ROIs (regions of interest) in two-dimensional and three-dimensional space.

Abstract: An apparatus for determining information about shape and/or location of an ellipse includes a coordinate determination means for determining two coordinates of a first ellipse point representing a point of the ellipse located furthest in the first direction, and for determining two coordinates of a second ellipse point representing a point of the ellipse located furthest in a direction opposite to the first direction. The coordinate determination means is formed to determine at least parameters of a first bent line segment approximating the ellipse at the first ellipse point or in a surrounding of the first ellipse point, and to determine the coordinates of the first ellipse point based on the at least one parameter of the first bent line segment. Similarly, the coordinate determination means is formed to determine the coordinates of the second ellipse point.

Abstract: A method and device for optically stimulating the visual system during static perimetry and for objectively evaluating adequate stimulus-related electrophysiological and/or magnetophysiological quantities. Light stimuli with defined parameters derived from a predetermined correlation function and from the known intensity dependence of the excitation response amplitude are presented to the observer. The excitation responses contained in the ERG and/or in the EEG/MEG are detected and processed. These excitation responses are used to determine and topographically evaluate the local sensitivity of the visual system. In one embodiment, the light sources are fixed inside a perimeter, and the excitation responses are amplified and digitized by a device, which preferably comprises an ERG/EEG measuring system and an A/D converter.

Abstract: The invention relates to a method and an arrangement to detect and measure the phase of periodic bio-signals. The aim of the invention is to detect and measure a causal phase response in periodic bio-signals with improved reliability and higher speed compared to conventional methods, simultaneously reducing the computing power required. According to the invention, a status observer is set up in parallel with the analyzed biological system. The output variables of the biological system and the observer are evaluated in order to minimize the occurring error. The determined phase of a periodic bio-signal can, for example, be used for functional diagnostic purposes.

Abstract: A method and arrangement for acquiring an electroencephalogram (EEG) are disclosed. A first set of electrodes is arranged to sense cortical signals generated primarily in a region of interest (ROI). A second set of electrodes are arranged to sense cortical signals generated inside and outside of the ROI. Individual signals sensed by each electrode of the first and second sets of electrodes are directed to a signal analyzer.

Abstract: According to the invention, the eye of the subject is lit with light from the non-visible spectrum (infrared light) in such a way that its image, taken with an infrared camera, is of sufficiently high-contrast for an evaluation, so that the actual line of sight can be calculated from the picture based on the characteristics of the eye and that, proceeding from the determined line of sight, the coordinates of the coming optical stimulation can be adjusted in such a way that the intended retinal area is stimulated.

Abstract: The invention relates to the multi-channel recording of signals of various biological origins in the frequency range of 0 to several kilohertz, preparation of the reference potential for the differential amplifier on each channel, from the determined data from the analogue to digital converter and predominantly, though not exclusively, all areas of medicine in which biosignals are used.

Abstract: The invention concerns an arrangement and a procedure for the spatial directed capturing of the electro encephalogram from selected brain areas with electrodes that are attached on the skull surface of an examined person.

Abstract: The invention relates to a method and arrangement for optically stimulating the visual system according to the requirements of the static perimetry and for objectively evaluating adequate stimulus-related electrophysical and/or magnetophysical quantities. Physiologically adequate luminous excitations with defined luminous parameters derived from a predetermined correlation function and from the known intensity dependence of the excitation response amplitude are presented to the observer. The excitation responses contained in the ERG and/or in the EEG/MEG are detected and processed. These excitation responses are used to determine and topographically evaluate the local sensitivity of the visual system. In one embodiment, the light sources are fixed inside a perimeter (1), and the excitation responses are amplified and digitized by a device (3), which preferably comprises an ERG/EEG measuring system and an A/D converter.

Abstract: A first layer of photoresist material, sensitive to radiation of a first wavelength, has a second layer of photoresist material, sensitive to radiation of a second wavelength, deposited thereon. A pattern of radiation of the second wavelength is then formed on the second layer of photoresist material which is subsequently treated with a solvent, in which the first layer of photoresist material is insoluble, to develop a first periodic profile. The first layer of photoresist material is then exposed to radiation of the first wavelength through the first periodic profile and treated to develop a second periodic profile. By directing the radiation of the second wavelength through the first periodic profile a an angle to normal to the first photoresist material a blaze profile may be obtained.