Abstract: A method for determining the stamping quality of profiled bar includes steps of: a) upstream of the rolling stand performing shaping, the initial speed VA of the starting product is determined and the initial diameter DA or initial cross-sectional area FA are determined contactlessly. b) After the rolling stand, the final speed VE of the end product is measured and the diameter DE or area FE of a virtual enveloping shell for the end product is determined contactlessly. c) The diameter DN of a virtual, round end product is determined contactlessly as DN=square root of (DA2*VA/VE) and/or the average cross-sectional area FNE of the end product (2) is determined contactlessly as FNE=FA*VA/VE. d1) The characteristic stamping variable PKG is calculated, and the characteristic stamping variable PKG is compared with a pre-set setpoint value PKGset. A device for carrying out the method is also provided.

Abstract: A method for determining the stamping quality of profiled bar material, in particular of steel concrete-reinforcing bars, which is advanced in a rolling train, is provided, with the following steps: a) upstream of the rolling stand (3) performing the shaping, the initial speed VA of the starting product (1) provided with a stamping by shaping is determined and, if not yet known, the initial diameter DA and/or the initial cross-sectional area FA are determined contactlessly, b) after the rolling stand (3) performing the shaping, the final speed VE of the end product (2) is measured and the diameter DE and/or the cross-sectional area FE of a virtual enveloping shell for the end product (2) is/are determined contactlessly, c) of the end product (2), the diameter DN of a virtual, round end product is determined contactlessly as DN=square root of (DA2×VA/VE) and/or the average cross-sectional area FNE of the end product (2) is determined contactlessly as FNE=FA×VA/VE, d1) the characteristic stamping variable PKG i

Abstract: A method for measuring the roundness profiles moved forward in longitudinal direction inside a rolling mill, using two laser scanners, respectively provided with a light-sensitive sensor and a laser. At least three shadow edges that fit against the round profile to be measured and enclose the round profile to form a polygon are generated and measured and the corresponding tangents are computed.

Abstract: A method for measuring the roundness profiles moved forward in longitudinal direction inside a rolling mill, using two laser scanners, respectively provided with a light-sensitive sensor and a laser. At least three shadow edges that fit against the round profile to be measured and enclose the round profile to form a polygon are generated and measured and the corresponding tangents are computed.

Abstract: A method of measuring a dimension and/or position of an object located in a measuring field, includes projecting a fan-shaped reference wave onto a holographic optical element having a first interference pattern and a second interference pattern; forming a first parallel partial wave front from the fan-shaped reference wave using the first interference pattern, the first parallel partial wave front entering the measuring field; and forming a second parallel partial wave front from the fan-shaped reference wave using the second interference pattern, the second parallel partial wave front entering the measuring field; wherein the measuring field is located behind the holographic optical element, and the first parallel partial wave front and the second parallel partial wave front intersect in the measuring field. A method of making a holographic optical element is also disclosed.

Abstract: A method of measuring a dimension and/or position of an object located in a measuring field, includes projecting a fan-shaped reference wave onto a holographic optical element having a first interference pattern and a second interference pattern; forming a first parallel partial wave front from the fan-shaped reference wave using the first interference pattern, the first parallel partial wave front entering the measuring field; and forming a second parallel partial wave front from the fan-shaped reference wave using the second interference pattern, the second parallel partial wave front entering the measuring field; wherein the measuring field is located behind the holographic optical element, and the first parallel partial wave front and the second parallel partial wave front intersect in the measuring field. A method of making a holographic optical element is also disclosed.

Abstract: A contactless system for measuring centricity and diameter includes an optical measuring device for determining the external diameter and the position of a cable on an optical, perpendicular plane that runs transversally to the central axis Z of a measuring device. The cable has a conductor and a jacket that insulates the conductor and is pulled through the measuring device along the central axis Z. The system also includes an inductive measuring coil device for determining the position of the conductor on an inductive measuring plane, which is likewise perpendicular and runs transversally to the central axis Z of the measuring device. A correlation device correlate the position of the cable, determined by the optical measuring device with the position of the conductor calculated by the inductive measuring coil device and calculates the centricity of the conductor in the jacket from the correlation.

Abstract: The invention relates to a contactless system for measuring centricity and diameter, comprising i) an optical measuring device (13, 13?, 14, 14?) for determining the external diameter and the position of a cable (3) on an optical, perpendicular plane that runs transversally to the central axis Z of a measuring device (2), whereby said cable (3) has a conductor (4) and a jacket (5) that insulates said conductor and is pulled through the measuring device (2) along the central axis Z, ii) an inductive measuring coil device (1) for determining the position of the conductor (3) on an inductive measuring plane, which is likewise perpendicular and runs transversally to the central axis Z of the measuring device (2), and iii) means, which correlate the position of the cable (3), determined by the optical measuring device (1) with the position of the conductor (4), calculated by the inductive measuring coil device (1) and which calculate the centricity of the conductor (4) in the jacket (5) from said correlation.

Abstract: A holographic optical element is provided for measuring the dimension and position of an object with aid of a deflected laser beam generated by a monochromatic and coherent laser light source that sweeps across an angular range to produce a fan-shaped reference wave front. The element includes at least two interference patterns. Each interference pattern is created through simultaneous exposure of the element to the fan-shaped reference wave front generated by the monochromatic and coherent laser light source and a parallel partial wave front generated by the same monochromatic and coherent laser light source and hitting the element at a different angle than the reference wave front. The number of parallel partial wave fronts used for the exposure of the element corresponds to the number of interference patterns, and if the parallel partial wave fronts are virtually extended through the holographic optical element, they intersect behind the element in a center of a measuring field.

Abstract: An image of a moving object with an optically differentiatable structure is projected onto a grid of opto-electric transducers through a lens. The output signals of at least one square group of four transducers A-D are processed to produce from output signals of the respective transducers a pair of signals I=A+B-C-D and II=B+C-A-D. The nature of the object is such as to cause periodically varying signals in the transducers, and there are thus concerned two signals shifted by a quarter period, from which the direction of movement can be determined by means of a logic circuit. From the frequency of the signals the velocity can be ascertained. By means of direction dependent counters the path of the object can be determined from the signals. With a two dimensional matrix of transducers measurements can be effected of movement of the object in different directions. The measurement is simple and offers versatile possibilities of exploitation.

Abstract: In a device for the production of a telecentric light beam which is to be deflected over a defined region an incident light beam impinges upon a rotating plane mirror. The light beam reflected thereby reaches the outlet of the device by way of a further co-rotating parallel plane mirror as a telecentric light beam. There is thus obtained by simple optical means a deflection over a region which is considerable in comparison with the dimensions of the device, and the shifting of the deflected light beam occurs according to a simple mathematical function, more especially a sine function. This simple mathematical relationship of a rotary angle and a displacement of the light beam enables an especially simple evaluation of measurement data.