A method and device for measuring the layer thickness of an object. Initially, an object with a layer thickness is provided. Thereupon, at least two measurement steps are performed, where electromagnetic radiation with frequencies in a frequency band associated with the respective measurement step is radiated on the object in each case. The frequency bands are different portions of one bandwidth. Secondary radiation emanating from the boundary surfaces of the object is detected and a measurement signal associated with the measurement step is ascertained. The measurement signals are combined according to the respective frequency bands associated with the measurement steps in order to form an evaluation signal; a fundamental frequency is determined therefrom, and the layer thickness is calculated. A large bandwidth can be realized by a narrow-bandwidth measurement steps by the method. As a result, physical limits of known methods are overcome, and the measurement accuracy is increased.
G01B 15/02 - Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
2.
METHOD AND DEVICE FOR MEASURING A LAYER THICKNESS OF AN OBJECT
A method and device for measuring a layer thickness of an object are described. At least two measurement steps are performed, wherein electromagnetic radiation with frequencies in a frequency band associated with the respective measurement step is radiated on the object in each case. The frequency bands are different portions of one bandwidth. Secondary radiation emanating from boundary surfaces of the object is detected and a measurement signal associated with the measurement step is ascertained. The measurement signals are combined according to the respective frequency bands associated with the measurement steps to form an evaluation signal; a fundamental frequency is determined therefrom, and the layer thickness is calculated. The method enables realization of a large bandwidth by means of narrow- bandwidth measurement steps. As a result, physical limits of known methods are overcome, and the measurement accuracy is increased.
Method for determining at least one layer property of a layer to be determined, in particular a foam layer, in an extrusion process, where a supply material is at least partially foamed and an extrusion product with the foam layer is put out (in other words, is output). The method has at least the steps of irradiating the extrusion product using electro-magnetic radiation, and electro-magnetically measuring at least one radiation having travelled through the foam layer. Measuring at least one feed-in rate or feed-in volume of the supply material, and determining the at least one material property of the layer to be determined from the measured feed-in volume and the electro-magnetic measurement.
B29C 48/09 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
G05D 5/03 - Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric means
B29C 44/50 - Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
Measuring device for measuring test objects includes a transmitter-receiver unit and a corresponding mirror arrangement. Mirror arrangement has a first mirror forming a first focal point and a second focal point in an x-y plane, and first mirror is, at least sectionally, elliptically curved for deflecting radiation between the focal points. Mirror arrangement includes a second mirror arranged in region of first focal point, second mirror is used for deflecting radiation between a z-direction extending transversely to the x-y plane and between the x-y plane. Test object to be measured is arranged in region of second focal point by a test object holder. Radiation reflected on test object is evaluated by a control unit. Measuring device allows measuring of test object in simple and flexible way, in particular measurement over the entire circumference of test objects in form of plastic pipes having circular cross sections.
G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness
B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)
The invention relates to a method for determining at least one layer property of a layer to be determined, in particular of a foam layer (16), in an extrusion process, wherein a feed material (7) is at least partially foamed and an extrusion product (2) having the foam layer (16) is output, comprising at least the following steps: a) irradiating the extrusion product (2) with electromagnetic radiation (S), b) performing an electromagnetic measurement at least of radiation (R) that has passed through the foam layer (16), c) measuring at least one feed rate or feed amount of the feed material (7), and d) determining at least one material property of the layer (16) to be determined from the measured feed amount (z) and the electromagnetic measurement.
B29C 44/50 - Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
09 - Scientific and electric apparatus and instruments
Goods & Services
Measuring devices for measuring the thickness of walls and
material layers; parts for the aforesaid measuring devices,
in particular radiation sources, sensor and detectors.
09 - Scientific and electric apparatus and instruments
Goods & Services
(1) Measuring devices for measuring the thickness of walls and material layers; parts for the aforesaid measuring devices, in particular radiation sources, sensor and detectors
09 - Scientific and electric apparatus and instruments
Goods & Services
Measuring devices for measuring the thickness of walls and material layers; parts for the aforesaid measuring devices, namely, sources of radiation in the nature of terahertz technology not for medical purposes, as well as sensor and detectors to receive and measure such radiation to measure and detect thickness
9.
Measuring device for reflection measurements of test objects and method for measuring radiation reflected by test objects
A measuring device for reflection measurements of test objects includes a transmitter for emitting radiation, a first collimation element for aligning the emitted radiation, a first focusing element for focusing emitted radiation in relation to the test object, and a receiver for detecting radiation reflected by the test object. There is a second collimation element for aligning the reflected radiation, and a second focusing element for focusing the reflected radiation in relation to the receiver. At least two of the first and second collimation elements and first and second focusing elements are separate from each other. Thus, a simple and flexible design of the measuring device is achieved, which can be adapted to the test object.
G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared lightInvestigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
G01N 29/22 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic wavesVisualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object Details
09 - Scientific and electric apparatus and instruments
Goods & Services
Measuring devices for measuring the thickness of walls and material layers; Parts for the aforesaid measuring devices, in particular radiation sources, sensor and detectors.
11.
TERAHERTZ MEASURING DEVICE AND METHOD FOR MEASURING TEST OBJECTS
The invention relates to a measuring device (1) for measuring a test object (2), which measuring device (1) comprises a transmitter-receiver unit (3) and a corresponding mirror arrangement (4). The mirror arrangement (4) comprises a first mirror (7), which forms a first focal point (B1) and a second focal point in an x-y plane (Exy), and which mirror (7) is, at least sectionally, elliptically curved for deflecting radiation (S, R) between the focal points (B1). The mirror arrangement (4) further comprises a second mirror (8) arranged in the region of the first focal point (B1), which mirror (8) is used for deflecting the radiation (S, R) between a z-direction extending transversely to the x-y plane (exy) and between the x-y plane (Exy). The test object (2) to be measured is arranged in the region of the second focal point by means of a test object holder (5). The radiation (R) reflected on the test object (2) is evaluated by means of a control unit (6). The measuring device (1) according to the invention allows the measuring of the test object (2) in a simple and flexible way, in particular a measurement over the entire circumference of test objects (2) in the form of plastic pipes having a circular cross section.
G01B 11/00 - Measuring arrangements characterised by the use of optical techniques
G01B 15/00 - Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
G01B 17/00 - Measuring arrangements characterised by the use of infrasonic, sonic, or ultrasonic vibrations
12.
Extrusion line for producing peroxide-cross-linked polyethylene pipes
An extrusion line for the production of peroxide cross-linked polyethylene pipes includes a cross-linking oven (5, 13) having an actuated deflection roller (7). The cross-linking oven has a first heating section (A) that extends from an inlet to said deflection roller (7) and a second heating section (B) that extends from said deflection roller to an outlet. An element is provided for adjusting a height of the deflection roller (7) and an angle of the first and second heating sections (A, B) relative to a horizontal plane.
B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)
B29C 47/88 - Heating or cooling the stream of extruded material
B29C 35/10 - Heating or curing, e.g. crosslinking or vulcanising by wave energy or particle radiation for articles of indefinite length
B29C 55/22 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of tubes
B29C 35/08 - Heating or curing, e.g. crosslinking or vulcanising by wave energy or particle radiation
B29K 105/10 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns oriented
B29K 105/24 - Condition, form or state of moulded material cross-linked or vulcanised
A method and extrusion line for producing peroxide-cross-linked polyethylene pipes in an extrusion line having an extruder, a cross-linking furnace and a flue. The extruded tube is subjected to a stretching process, and the cross-linking furnace has a first heating section that extends from its inlet to an actuated deflection roller and a second heating section from the deflection roller to its outlet. The stretching process in the first heating section and the stretching process in the second heating section are monitored and regulated in such a manner that the necessary stretching of the pipe takes place primarily in the first heating section, and the stretching of the pipe in the second heating section is subjected to zero adjustment. In this case, the height of the deflection roller(s) of the cross-linking furnace and the angle of the heating sections to the horizontal plane can be height-adjustable.
09 - Scientific and electric apparatus and instruments
Goods & Services
Machines for processing plastics and parts therefor, in particular ovens, injection moulding dies, extrusion screws and extrusion cylinders, plasticising elements, agitating tools, calibrating devices and tables, vacuum chambers, transport devices and saws. Mechanical, hydraulic, optical, acoustic measuring; apparatus for the recording, the transmission and the reproduction of data.
