Abstract：Aiming at the selection of test targets for on-line detection of composition in molten steel by laser induced breakdown spectroscopy, a method for automatic positioning system of test targets based on LabVIEW was proposed in order to better perform the real-time and on-line detection of molten steel compositions. This control system fully utilized the superiority of LabVIEW in instrument control and machine vision. The experimental platform was constructed with the help of MC600 series controller and motorized positioning system. The automatic positioning of test targets could be realized by sending the command code with correct format to MC600 series controller. Moreover,the accuracy and safety of automatic positioning of test targets were effectively improved by edge extraction. The automatic positioning system avoided the complicated procedures for selection of test targets in manual control and guaranteed the effectiveness of detection process,thus greatly improving the work efficiency.
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