Abstract: An intravascular sensor device can be used to guide treatment of a diseased blood vessel in the body of a patient. In some examples, the intravascular sensor device includes a pressure sensor and an ultrasound transducer. The intravascular sensor device is used to measure a pressure within the diseased blood vessel and acquire an ultrasound image of the diseased blood vessel. The pressure may be measured during hyperemic blood flow that is caused by a pharmacologic vasodilator drug. The measured pressure can be used to calculate a fractional flow reserve value. The ultrasound image can be used to determine a physical dimension of the blood vessel, such as cross-sectional area. The fractional flow reserve value and physical dimensions of the blood vessel can be used to optimize patient treatment.

Abstract: A measuring device (1) is provided for measuring the flow rate of a medium (5) flowing through measuring tube (3). The measuring device (1) contains means for generating a constant magnetic field (B) perpendicular to the flow direction (v) of the medium (5) and at least two decoupling regions (7, 7?) which are disposed in a plane (E) perpendicular to the flow direction (v) of the medium (5) on the wall (9) of the measuring tube (3). Each decoupling region (7, 7?) comprises an electrode (13, 13?) which has a non-metal porous layer (11) on the side facing the medium (5) and a measuring unit (19) for detecting a measuring signal. In the measuring device (1), the porous layer (11, 11?) comprises an oxidic and/or non-oxidic ceramic material.

Abstract: A measuring device (1) is provided for measuring the flow rate of a medium (5) flowing through measuring tube (3). The measuring device (1) contains means for generating a constant magnetic field (B) perpendicular to the flow direction (v) of the medium (5) and at least two decoupling regions (7, 7?) which are disposed in a plane (E) perpendicular to the flow direction (v) of the medium (5) on the wall (9) of the measuring tube (3). Each decoupling region (7, 7?) comprises an electrode (13, 13?) which has a non-metal porous layer (11) on the side facing the medium (5) and a measuring unit (19) for detecting a measuring signal. In the measuring device (1), the porous layer (11, 11?) comprises an oxidic and/or non-oxidic ceramic material.

Abstract: Recognizing a substrate stock by light-sensitive sensors inside a printing unit, by a sensor that can recognize several ranges of light wavelengths. By separate recognition of various ranges of light wavelengths, a substrate stock is recognized whenever the total reflection capabilities of surface and substrate stock determined across all light wavelengths coincide.

Abstract: To regulate the gloss on a print material, and avoid excess release oil, the properties of the fusing medium are measured, and the gloss on the print material is determined on the basis of the measured properties of the fusing medium.

Abstract: To regulate the gloss on a print material, and avoid excess release oil, the properties of the fusing medium are measured, and the gloss on the print material is determined on the basis of the measured properties of the fusing medium.

Abstract: In a method and a circuit arrangement for driving laser diodes arranged in close proximity to one another in a laser recording device, video signals modulated with the information to be recorded generate driver currents for the laser diodes. The light powers output by the laser diodes drop due to crosstalk between the laser diodes. For compensation of the crosstalk, correction units are connected between first laser diodes that form crosstalk sources and second laser diodes that form crosstalk sinks. In the correction units, the driver currents of the first laser diodes are converted into correction signals according to the transfer functions of the correction units, the correction signals correcting the driver currents of the second laser diodes such that the crosstalk is compensated. For determining the transfer functions of the correction units, the time curves of the light powers in the crosstalk sinks are measured and approximately electrically simulated as transfer functions.

Abstract: Detecting an object, where a light source and an optical receiver are used, and the object is detected by having it intersect the ray of light between the light source and the optical receiver. The optical receiver includes, at least, a fluorescing device.

Abstract: Detecting various colors on a surface, whereby a varying distance between a sensor device and the surface is detected, and the sensor device's signals are functionally linked to the varying distance. Measurement of the surface using the sensor device serves the purpose of both detecting the color and detecting the distance between the sensor device and the surface. The color value of the surface is determined depending on the distance of the surface from the sensor device.

Abstract: A method and an apparatus for exposing photosensitive material, in particular for exposing a printing form, in which a surface to be exposed of the photosensitive material is scanned by at least one light beam. The light beam is emitted by a light source and, before striking the photosensitive material, is optionally modulated, interrupted and/or deflected. An exposure head is provided and moved at a constant distance from the surface in relation to the latter and to the light source in order to scan the surface of the photosensitive material with the light beam. In order to make the exposure head as light as possible, after the light beam has emerged from the light source substantially parallel to the surface to be exposed, the light beam is deflected through a gaseous medium toward the exposure head and there should be reflected onto the surface.

Abstract: Recognizing a substrate stock by light-sensitive sensors inside a printing unit, by a sensor that can recognize several ranges of light wavelengths. By separate recognition of various ranges of light wavelengths, a substrate stock is recognized whenever the total reflection capabilities of surface and substrate stock determined across all light wavelengths coincide.

Abstract: Monitoring and/or adjusting the forming of a printed color image by an image forming apparatus, preferably of a color image formed electrophotographically with toner. Light reflected or reflected back from a fixed toner image of a finished printed image is captured by a sensor device still within the image forming apparatus (online), the sensor device or its capturing result being used for controlling or adjusting the image forming process.

Abstract: A method for prolonging the service life and increasing manufacturing output, respectively, of solid-state lasers provided and predetermined, respectively, for continuous operation, which includes forming the lasers into a laser bar with a group of active laser strips arranged next to one another at a mutually spaced distance, activating the active laser strips during the continuous operation by having current applied jointly thereto, and providing the laser bar with at least one group of further laser strips, respectively, arranged in interspaces between respective adjacent active laser strips of the group thereof. While the current is applied to the active laser strips, the method further includes applying no current to the further laser strips so that the further laser strips are inactive, and checking the functionality of the active laser strips during the continuous operation, and activating at least one of the inactive laser strips if a failure of at least one of the active laser strips should occur.

Abstract: A method and an apparatus for exposing photosensitive material, in particular for exposing a printing form, in which a surface to be exposed of the photosensitive material is scanned by at least one light beam. The light beam is emitted by a light source and, before striking the photosensitive material, is optionally modulated, interrupted and/or deflected. An exposure head is provided and moved at a constant distance from the surface in relation to the latter and to the light source in order to scan the surface of the photosensitive material with the light beam. In order to make the exposure head as light as possible, after the light beam has emerged from the light source substantially parallel to the surface to be exposed, the light beam is deflected through a gaseous medium toward the exposure head and there should be reflected onto the surface.

Abstract: A device for detecting the position of rotating objects, having an optical signal transmitter and an optical sensor, includes a stationary light source provided in the optical signal transmitter for generating along an optical axis a light beam directed onto a rotating object, the optical sensor being stationary and being arranged on the optical axis on a side of the rotating object located opposite the optical signal transmitter, in the region of the optical axis of the signal transmitter and the sensor, the rotating object being formed with a diametrically extending bore having an entrance window for the light beam and an opposite exit window for the light beam, a slit diaphragm arranged in vicinity of the exit window, and an objective for focusing the light beam onto the slit diaphragm arranged in vicinity of the entrance window, the slit of the slit diaphragm being aligned with a transverse extent thereof at least approximately perpendicularly to an axis of rotation of the rotating object.

Abstract: An apparatus for splitting a light beam into two sub-beams is formed of a stationary light source for generating a light beam, of a first polarization converter and of a deflection unit rotating around the optical axis in which two sub-beams are generated from the light beam. The deflection unit contains a polarization beam splitter, a following, second polarization converter and a reflector that is preferably designed as a prism. An automatic correction of positional offsets of the sub-beams is implemented in the deflection unit since the polarization beam splitter or the deflection unit is tilted and/or the lenses are shifted with adjustment drives. The positional offsets of the sub-beams are measured in their focus plane, and corresponding correction values are transmitted with a transformer to the adjustment drives in the rotating deflection unit.

Abstract: A device for deflection of a light beam formed of a light-permeable deflection prism extending in a direction of a rotational axis. The prism has a light entry face, a reflection face proceeding obliquely thereto and a light exit face, and is further formed of a carrier prism joined to the deflection prism at the reflection face. The carrier prism supplements the deflection prism to essentially form a cuboid unit that is seated rotatably around an optical axis that resides perpendicularly relative to the light entry face of the deflection prism. For producing a unit designed rotationally symmetrical relative to the optical axis at least in regions, the optically unused edges and corners of the cuboid unit are rounded. Spherical caps are attached to at least two of the unused outside surfaces of the unit, these spherical caps supplementing the unit to form a spherical outside contour at least in regions.

Abstract: A deflection device is provided which serves the purpose of deflecting optical radiation and is designed of at least one prism. The prism is provided with at least one reflection surface and is rotationally seated with respect to a rotational axis. In order to enable high speeds, the deflection device is designed of at least two prisms that have an essentially symmetrical mass distribution with respect to the rotational axis.

Abstract: A device is provided for division of a light beam into two sub-beams. A polarization beam splitter is provided having a polarizing layer which, dependent upon polarization direction, resolves an incident polarized light beam into a beam component reflected by the polarizing layer as a first sub-beam, and into a beam component transmitted in a direction of an axis of the light beam. The polarization beam splitter is followed along the beam axis by a phase transformer and by a mirror. The phase transformer undertakes a transformation of a linear polarization into circular polarization upon passage of the transmitted beam component therethrough. The resulting circularly polarized beam component is then reflected at the mirror. The phase transformer then produces phase rotation of the polarization by 90.degree. upon passage of the beam component reflected by the mirror.

Abstract: The invention concerns a process and circuit for correcting the light-power output of a laser diode. The circuit comprises a generator (2) for generating a driver current (I.sub.T) which determines the light-power output of the laser diode. The driver current (I.sub.T) is modulated by a modulation signal (B). To correct the light-power output, the circuit includes a linear low-pass filter (5) which is acted on by the modulation signal (B) and which approximately simulates the change with time of the internal temperature of the laser diode (1) as a function of the modulation signal (B). The output signal of the linear low-pass filter (5) acts as a driver current (I.sub.T) correction signal (K), thus compensating for the temperature dependence of the laser-diode light-power output.