System för optisk mätning av linjeprofil

Sammanfattning: Today’s industry is moving towards a fourth revolution based on digitilizing technologies to reduce errors and streamline processes. When manufacturing hydraulicsand other pressurized systems, couplings are pressed onto pipes and hoses that mustbe able to maintain an expected pressure. If such a coupling has not been pressedcorrectly, there is a risk of leakage. This can have devastating consequences such asa liquid polluting the environment, inhalation of toxic gas, an important work stop,or a pilot losing control of an aircraft. Lantz Measuring AB therefore wants to develop a system that will be able to effectively ensure that these couplings have the correct shape around the entire couplingwith an accuracy of 0.1 mm. With this information, the manufacturer should beable to ensure that a coupling is correctly pressed. In this paper, a prototype for such a system has been developed as a contribution toa product that will meet Lantz Measuring’s requirements for accuracy, durability,and cost-effectiveness. The system is based on optical triangulation, which meanscalculating the line profile via the refraction of line lasers against the coupling usingimage sensors. Control and processing takes place with an FPGA and associatedperipherals.  The prototype shows that the requirement for trueness in the measured value is met,but that there is room for improved precision. Sources of error and methods thatcontribute to improved results are presented. The work describes the developmentof the system, testing of precision, and analysis of results.