摘要:
A measuring arrangement is calibrated for determining rotational positions of a rotary device that has a first part and a second part which can be rotated relative to the first part about a rotational axis. Rotational positions of the first part relative to the second part and/or rotational positions of the second part relative to the first part are detected using a plurality of sensors distributed about the rotational axis. A respective measurement signal corresponding to each detected rotational position is generated such that redundant information on the rotational positions of the first part and the second part relative to each other is provided. The redundant information on the rotational position(s) are analyzed such that effects of a translational movement of the first and the second part relative to each other are corrected, the translational movement running transverse to the extension of the rotational axis.
摘要:
A reference measurement object having known properties is used for the purpose of calibrating a coordinate measuring machine. A plurality of reference measured values are picked up on the reference measurement object. Calibration data are determined using the reference measured values and using the known properties of the reference measurement object. The calibration data comprises a first number of polynomial coefficients that are selected to correct nonlinear measuring errors using at least one polynomial transformation. The first number of polynomial coefficients is reduced in an iterative method to a lesser second number, with a plurality of pairs of polynomial coefficients being formed and with a polynomial coefficient of a pair being eliminated in each case when a statistical dependence between the polynomial coefficients of the pair is greater than a defined threshold value.
摘要:
The aim of the invention is to provide a method, network control unit and a communication network for optimising the traffic in a communication network that is configured from network components, these entities permitting a degradation of service quality caused by the non-availability of network components to be at least temporarily averted. The solution to said aim is provided by a method for network access control in a communication network configured from network components, said method comprising the following steps: a) introduction of an additional traffic class to supplement a non-prioritising traffic class, more particularly a best effort class, and a traffic class offering a quality of service; b) configuration of a predeterminable bandwidth for the transmission of traffic in the additional traffic class; c) positioning of the additional traffic class above the non-prioritising traffic class and below or on the same level as the traffic class offering a quality of service; and d) authorisation of the use of the predeterminable bandwidth for the transmission of traffic in the additional traffic class for a predeterminable time period.
摘要:
There is a method and a device allowing the distributed calculation of routing tables for routing in a communication network containing nodes and links. The calculation of routes to be used is carried out in centrally. Data relating to the routes to be used are transmitted to a node which, based on said information, generates a routing table by assigning packet addresses to the routes. The central calculation of the routes results in an increased efficiency of resources while requiring less calculation effort which is particularly advantageous in the context of networks comprising multipath routing where the calculation of routing tables is very complex. A further reduction in effort can be achieved by means of the central calculation of the distribution weightings.
摘要:
The invention is directed to a method for determining the image quality of an optical imaging system and to the use of the method according to the invention for determining the influence of samples on the amplitude distribution and phase front distribution of the illumination light, of which the amplitude distribution is known in particular. The invention comprises the following steps: adjusting the subassemblies relative to one another in such a way that it is possible to project images of a sample on the detection device; recording a plurality of images of the sample from different reference planes near the focus plane; improving the image quality by image processing, particularly to reduce noise, to compensate for local variations in sensitivity of the detection device, and to center the intensity centroids respectively on a predetermined location in the images; computational linking of the spatially resolved image information, of adjustment values and system variables relating to the optical imaging system, and of information concerning the sample with the aim of determining characteristic numbers that are characteristic of the wavefront deformation caused by the imaging system; and outputting the characteristic numbers and associating them with the imaging system for describing the image quality.
摘要:
A fire-retarding cable conduit for electrical lines in regions potentially exposed to fire in aircraft, has a tubular base body including an interior space for accommodating the electrical lines and may include a sheath. The base body comprise a plastic foam material, which in the event of a fire is intumescent the intumescent foam may form a material that is substantially free of plastic when exposed to fire. A continuous longitudinal slit may be provided for inserting the electrical lines into the tubular base body and may use a form that protects the lines during exposure to fire.
摘要:
An arrangement making use of two-dimensional arrays consisting of individually controllable elements, for forming aperture diaphragms in the beam paths of optical devices. In an arrangement of diaphragm apertures and/or filters, in which the form, position and/or optical characteristics can be changed, for use in optical devices, at least one two-dimensional array, consisting of individually controllable elements, is arranged for forming the diaphragm apertures and/or filters in the optical imaging and/or illumination beam paths and is connected with a control unit for controlling the individual elements In this way, the geometry, the optical characteristics and/or the position of the aperture diaphragms and/or the filters can be controlled very quickly. These changes can also be made “online” during the process of measurement or adjustment in the sense of optical fine tuning. Furthermore, using these systems, the elaborate and time consuming preparation of the diaphragm apertures with geometric forms can be omitted.
摘要:
An apparatus delivers x-rays to at least a portion of an interior surface of a body cavity. The apparatus includes a flexible catheter, at least one balloon or inflatable element affixed to the catheter, one or more flexible probe assemblies, an x-ray generator assembly coupled to the distal end of each probe assembly, and a power supply means. The flexible catheter includes one or more interior channels, and each flexible probe assembly is slidably positionable within a respective interior channel of the catheter. Each balloon, when inflated, defines a predetermined surface contour disposed about an interior region of a body cavity. Each flexible probe includes a transmission path for transmitting activating energy, and may be an optical fiber for transmitting optical energy. The x-ray generator assembly includes an electron source and a target element. The electron source emits electrons in response to activating optical energy transmitted through the transmission path. The target element generates electrons in accordance with a desired radiation profile, in response to electrons impinging thereon.
摘要:
An apparatus for applying x-rays to an interior surface of a body cavity includes a catheter assembly, and one or more flexible probe assemblies. An x-ray generator assembly, including an optically activated x-ray source, is coupled to a distal end of each flexible probe assembly. The catheter assembly includes a body member defining one or more interior channels; an x-ray absorption control layer surrounding the body member; at least one inner tube enclosing the body member and the absorption control layer; at least one outer tube; and one or more inflatable elements coupled to the inner tube. The inflatable elements, when inflated, fixedly position the catheter assembly within the body cavity. Each flexible probe assembly is slidably positionable within at least one of the interior channels, and includes a transmission path adapted to transmit an activating energy, such as light from laser, onto a cathode within the x-ray source.
摘要:
A sensor head characterizes unsteady pressures in a fluid flowing within a pipe, as may be caused by one or both of acoustic waves propagating through the fluid within the pipe and/or pressure disturbances that convect with the fluid flowing in the pipe. The sensor head comprises a rigid support structure and at least one transducer attached to the rigid support structure. The rigid support structure holds the transducer in contact with an outer surface of the pipe. The at least one transducer senses relative movement between the outer surface of the pipe and the support structure and provides a signal indicative of unsteady pressures within the fluid at a corresponding axial position of the pipe in response to the relative movement. The support structure may be attached to each transducer in an array of transducers, and may include a handle secured thereto for manipulating the sensor head into contact with the pipe. Output signals from the transducers are provided to a processing unit, which processes the output signals to provide a signal indicative of at least one parameter of the flow process.