Katja Giersch 2017-11-07 04:17:26
by: Katja Giersch, Head of Corporate Communications SIKORA AG Bruchweide 2 28307 Bremen, Germany www.sikora.net Advantages of gauges that use the digital measuring method with CCD line sensors. An increasing quality awareness in many areas of daily life and especially in the field of industrial goods has been observed for some years. Manufacturers of wires and cables have also been investing intensively in measuring and control technology as well as in-line control over the last years. At the same time, among others, the diameter and ovality of products play a crucial role. These cable parameters can be measured in the production line by different techniques, which shall be described in the following article. Until now, three different methods for measuring the diameter have been established on the market. These three methods are: • Laser scanning • Conventional shadow projection • Diffraction-based method (laser shadow projection). Laser scanner measuring devices work with a rotating mirror or a rotating disk striking a laser beam across the measuring field. Thus, two lenses are used to adjust the laser beam almost parallel across the measuring field and onto a light sensor. The product diameter is then calculated by comparing the time during which the laser beam is shadowed by the product with the time the laser beam needs to pass the whole measuring field. The conclusion is that the measuring frequency depends on the rotation speed and the surface finish of the mirror. An averaging from several measurements is often necessary to achieve a high accuracy. By contrast, the digital measuring method with CCD line sensors requires no moving components. Therefore, the accuracy and the repeatability as well as the measuring rate using this technology are higher. The reader can easily distinguish between the classical shadow projection method and the diffraction-based method. The conventional shadow projection, like the laser scanning method, utilizes two lenses, which are installed in front of as well as behind the product. These lenses adjust the laser beam onto a CCD line, on which the darkened diodes are counted in order to determine the diameter by means of the shadow image. The conclusion here is that using optical lenses is very cost-intensive. As a result, assembly, alignment and calibration requirements have a negative impact on profits and amortization. With regard to the diffraction-based method—the measuring principle of SIKORA’s LASER Series 2000 and 6000— the high-resolution laser beam directly illuminates the CCD line. According to the theory of diffraction, the left and right geometrical-optics shadow edges are calculated from the diffraction fringe information. Thus, the product diameter can be determined by the distance of these edges from each other. Gauge heads with the CCD line sensor technology measure the diameter of transparent as well as opaque products in two or three planes. In addition, they work precisely independent of the materials used. The conclusion here is that the diffraction-based method functions with an extremely high measuring rate, and this measuring rate is only limited by the frequency of the CCD line sensors. This extremely high measuring rate allows several thousand measurements per axis per second for product diameters from 0.05 to 500 mm. Furthermore, the gauge heads of SIKORA’s LASER Series 6000 guarantee a reliable detection of lumps and neckdowns on the product surface. Additionally, upon request, the lumps and neckdowns can either be visualized directly on the display at the gauge head or displayed, documented and analyzed by SIKORA’s display and control devices. To learn more about the advantages of using SIKORA’s CCD line sensors for diameter measurement, visit the website below, where you can also find information and technical specifications on SIKORA’s entire measuring, control, inspection, analysis and sorting product lines. www.sikora.net Company Profile: SIKORA AG was founded in 1973 and celebrated its 40th anniversary in 2013. Today SIKORA AG is a leading global manufacturer and supplier of measuring, control, inspection, analysis and sorting technology for the wire and cable, hose and tube as well as optical fiber and plastics industries. With approximately 200 employees worldwide, and 14 offices and more than 30 regional representatives all over the world, the company provides innovative product solutions and individual service to its customers. The measuring and control systems that are available from SIKORA AG are exclusively manufactured at the company’s headquarters located in Bremen, Germany. www.sikora.net
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