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하성길,이세원,전원표,백광렬 제어·로봇·시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.1
There is increasing demand in various industries for non-destructive testing performed externally without destroying the product. This paper describes a system that can detect internal and external flaws. Various flaws can occur during the manufacture of Oil Country Tubular Goods. The system is intended to detect flaws using nondestructive evaluation of energy characteristic changes by applying light, heat, radiation, ultrasonic energy, electric energy, etc. without changing the original shape of the target substance. In this paper, ultrasonic signals are used to detect internal and external flaws in Oil Country Tubular Goods. A single-channel ultrasonic flaw detection system consisting of an ultrasonic signal transmitter unit, a processing unit, and a detection unit is designed. We design and manufacture a multi-channel ultrasonic flaw detection system and verify the system performance through test software.
하성길,이정은,문우성,백광렬,Ha, Sung-Kil,Lee, Jung Eun,Moon, Woo Sung,Baek, Kwang Ryul 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
The quality of steel plate products is determined by the number of defects and the process problems are estimated by shapes of defects. Therefore pinholes defects of cold rolled steel have to be controlled. In order to improve productivity and quality of products, within each production process, the product is inspected by an adequate inspection system individually in the lines of steelworks. Among a number of inspection systems, we focus on the pinholes detection system. In this paper, we propose an embedded system using FPGA which can detect pinholes defects. The proposed system is smaller and more flexible than a traditional system based on expensive frame grabbers and PC. In order to detect consecutive defects, FPGAs acquire two dimensional image and process the image in real time by using correlation of lines. The proposed pinholes detection algorithm decreases arithmetic operations of image processing and also we designed the hardware to shorten the data path between logics due to decreasing propagation delay. The experimental results show that the proposed embedded system detects the reliable number of pinholes in real time.
하성길(Sung-Kil Ha),이정은(Jung Eun Lee),문우성(Woo Sung Moon),백광렬(Kwang Ryul Baek) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.18 No.1
The quality of steel plate products is determined by the number of defects and the process problems are estimated by shapes of defects. Therefore pinholes defects of cold rolled steel have to be controlled. In order to improve productivity and quality of products, within each production process, the product is inspected by an adequate inspection system individually in the lines of steelworks. Among a number of inspection systems, we focus on the pinholes detection system. In this paper, we propose an embedded system using FPGA which can detect pinholes defects. The proposed system is smaller and more flexible than a traditional system based on expensive frame grabbers and PC. In order to detect consecutive defects, FPGAs acquire two dimensional image and process the image in real time by using correlation of lines. The proposed pinholes detection algorithm decreases arithmetic operations of image processing and also we designed the hardware to shorten the data path between logics due to decreasing propagation delay. The experimental results show that the proposed embedded system detects the reliable number of pinholes in real time.