Mr. Ying Meng Profile

Ying Meng

at Nanjing Univ of Science and Technology

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Proceedings Article | 28 February 2021 Paper

Research on FPGA-based laser measuring instrument for surface flatness

Ying Meng, Wenjian Chen, Wusen Li, Yuwei Zhao

Proceedings Volume 11781, 117811G (2021) https://doi.org/10.1117/12.2591311

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Strip flatness is an important indicator of steel quality, and its detection technology has always been the focus of research at home and abroad. This paper proposes a non-contact online real-time measurement scheme for hot rolled strip steel. Our research is based on the laser triangulation method, which transforms the flatness detection into the strip surface height detection. In order to prevent errors caused by jitter during strip transportation, we have added a three-point measurement method. The flatness measurement system has carried out the system hardware design with FPGA and linear CCD as the core and the system software design with the laser spot positioning as the core. The basic technology realization process is based on FPGA as the main control and processing chip, collecting the laser reflection light signal of the measured strip steel surface through the optical system through the linear array CCD to obtain the strip surface height information. The collected signals are subjected to photoelectric conversion, filtering and amplification, and A/D conversion, and are transmitted through a network port based on UDP protocol. Finally, the spot center is positioned by comparing the selected threshold method to obtain important data for calculating the flatness information. In this study, a semiconductor laser with a wavelength of 450nm, a TCD1304AP linear CCD and an FPGA chip of the XC7A35T model produced by Xilinx were selected. In the range of 4 mm above and below the reference position, the measurement accuracy of the system can reach 10μm, which meets the measurement requirements of the measured strip elongation accuracy of 1% (when the elongation is 10~200 I) or 1 I (when the elongation is less than 1 I).

Proceedings Article | 28 February 2021 Paper

Design of miniaturized high precision laser azimuth detection system

Yuwei Zhao, Wenjian Chen, Wusen Li, Ying Meng

Proceedings Volume 11781, 117811F (2021) https://doi.org/10.1117/12.2591307

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Seeker technology is the core of laser semi-active guidance. At present, laser semi-active guidance weapons are mainly used for large caliber ammunition such as shells, bombs and missiles, while small caliber ammunition is rarely used. It is an important development direction of laser semi-active guidance weapons. In this paper, a miniaturized high-precision laser azimuth detection system for laser semi-active guidance seeker is designed. On the basis of existing laser plate active guidance seeker technology, the working principle of quadrant detector is analyzed. A quadrant detector with photosensitive diameter of 3.04mm and photosensitive area product of 2.52mm² is selected to design a high-precision calculation based on FPGA which is different from sum difference algorithm Law. According to the actual needs, the design index of the optical system is summarized. An optical system with an entrance pupil diameter of 8mm is designed. The optical system is evaluated and analyzed. The propagation characteristics of the laser in the atmosphere are analyzed. A variable gain amplifier circuit with a gain adjustment range of 24dB is designed. In order to improve the signal-to- noise ratio and anti-interference ability, the relevant detection circuit is designed. The experimental results show that the average absolute error of the system is 0.09° which meets the design requirements.

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