An Automated calibration set up for laser beam positioning systems in visual inspection applications

Kiraz, Ercan
In this study, a calibration setup for laser beam positioning systems used in visual inspection applications in industry is designed and manufactured. The laser positioning systems generate movable parallel laser lines on the projection surface. There are several translational and angular error sources affecting the positioning accuracy of the laser lines on the projection surface. Especially, since the laser line positioning error caused by angular error sources increases with the distance between the laser system and the projection surface, angular parameters of the laser sources should be measured and adjusted precisely. The calibration setup developed in this study detects the laser line positions at two different projection distances by means of laser sensing cameras which are positioned precisely along the laser lines and laser positioning axis which is perpendicular to these lines. Cameras detect the positions of the laser lines which are directed to the camera sensors with micrometer repeatability by means of some special imaging algorithms. The precise positioning of the cameras requires a special camera positioning system. For this reason, the disturbances like temperature changes and vibration should be minimized. In order to provide a suitable environment for the calibration system, special tests are conducted and a special calibration room is constituted. Construction inside the room is also made by considering the required ambient parameters. Finally, several verification tests of the calibration system are conducted.


Development of a picosecond pulsed mode-locked fiber laser
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Fiber lasers represent the state-of-the-art in laser technology and hold great promise for a wide range of applications because they have a minimum of exposed optical interfaces, very high efficiency, and are capable of exceptional beam quality. In the near future, the most important markets such as micromachining, automotive, biomedical and military applications will begin to use this technology. The scope of this thesis is to design and develop a short picosecond pulsed fiber laser using rare-earth doped ...
Development of a burst mode oscillator free femtosecond fiber laser
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Lasers with short pulse duration have a wide range of applications in industry and science, such as telecommunication, processing, imaging, and metrology. A conventional and well-known method for producing short pulses is mode locking. However, mode locking ultrashort lasers have a limitation on repetition rate because of the cavity length. Several techniques have been proposed to overcome this limitation, such as harmonic mode locking and adding a repetition rate multiplier into a system. Nevertheless, the...
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A low-cost uncooled infrared microbolometer detector in standard CMOS technology
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Pumping chamber design in diode pumped solid-state lasers for maximum system efficiency and minimum optical distortion
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The beam quality and the system efficiency of a diode-pumped solid-state laser source are directly related to the thermal profile inside the laser crystal. The thermal profile in a laser crystal should be made uniform in order to reduce the negative effects of the thermal lens. However, the absorbed pump profile that forms a uniform thermal profile inside the gain medium may adversely affect the system efficiency. In this thesis, a computational and empirical method was developed for designing pumping chamb...
Citation Formats
E. Kiraz, “An Automated calibration set up for laser beam positioning systems in visual inspection applications,” M.S. - Master of Science, Middle East Technical University, 2013.