Micro-Epsilon Laser scanner provides 3D profiles of rotary pistons

  • October 17, 2011
  • Micro-Epsilon GmbH & Co. KG
  • Case Study

October 17, 2011 - A manufacturer of universal 3D measuring machines is using high precision laser profile scanners and laser displacement sensors from Micro-Epsilon to measure the surface profiles and position of rotary pistons. In rotary piston pumps, as the rotary pistons are responsible for the flow of the delivery medium, the specified geometrical shape of the pistons must be extremely precise and accurate. Two rotary pistons need to mesh exactly with one another as the pump rotates, with movement of the pistons terminating just before the wall housing. The required service life of a rotary piston pump can therefore only be maintained if the piston surface fits precisely with the pump housing. This means that the whole of the piston surface needs to be measured and compared with the target shape to very strict tolerances. Qsigma GmbH based in Kassel, Germany, has developed a universal 3D measuring machine for these types of applications. The piston is placed on the rotating axis of the machine. Micro-Epsilon’s scanCONTROL 2700 laser profile scanner with a 50mm measuring range is used to record the shape or profile of the piston’s surface. For larger components, the profile scanner can be traversed vertically using a linear motion system. In addition, an optoNCDT 2200 laser displacement sensor from Micro-Epsilon with a 200mm measuring range is integrated to the Qsigma measuring machine in order to determine the precise position of the component. The optoNCDT 2200 sensor acquires 10,000 distance values every second, operating at a resolution of 3µm. The piston rotates during measurements. Only five seconds are required for an automatic inspection of the piston. After successfully scanning the surface geometries, the data is compared with those of the target object. In addition to rotary pistons, the system can also be used to measure other rotationally symmetrical objects. Micro-Epsilon’s optoNCDT 2200 laser displacement sensor offers extremely high accuracy, high measuring rates and excellent signal stability, without any signal averaging. These sensors are world leaders in terms of their technical capabilities, enabling them to solve the most demanding measurement applications. The digital output signal can be combined with the IF2008 PCI card (also designed and supplied by Micro-Epsilon) to synchronise multiple sensors at high measuring speeds for easy data acquisition direct to a PC. Micro-Epsilon is a major global manufacturer of sensors, headquartered in Germany. The company’s range of displacement sensors measure everything from to distance, position, vibration, dimensions and thickness, using both contact and non-contact measurement techniques. These techniques include 1D, 2D and even 3D laser-optical sensors and systems, eddy-current, capacitive, LVDT & inductive, potentiometric and draw-wire principles. Additionally Micro Epsilon has developed its own range of non-contact infrared temperature sensors that can measure virtually any target temperature from -40 to +3,300°C.  

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