Mr. Xuan-yi Gao Profile

Xuan-yi Gao

at Beijing Institute of Technology

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Publications (3)

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Proceedings Article | 24 October 2017 Paper

Eddy current testing for blade edge micro cracks of aircraft engine

Wei-min Zhang, Min-dong Xu, Xuan-yi Gao, Xin Jin, Feng Qin

Proceedings Volume 10458, 1045806 (2017) https://doi.org/10.1117/12.2281274

KEYWORDS: Sensors

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Based on the problems of low detection efficiency in the micro cracks detection of aircraft engine blades, a differential excitation eddy current testing system was designed and developed. The function and the working principle of the system were described, the problems which contained the manufacture method of simulated cracks, signal generating, signal processing and the signal display method were described. The detection test was carried out by taking a certain model aircraft engine blade with simulated cracks as a tested specimen. The test data was processed by digital low-pass filter in the computer and the crack signals of time domain display and Lissajous figure display were acquired. By comparing the test results, it is verified that Lissajous figure display shows better performance compared to time domain display when the crack angle is small. The test results show that the eddy current testing system designed in this paper is feasible to detect the micro cracks on the aeroengine blade and can effectively improve the detection efficiency of micro cracks in the practical detection work.

Proceedings Article | 19 October 2016 Paper

Improved pulse laser ranging algorithm based on high speed sampling

Xuan-yi Gao, Rui-hai Qian, Yan-mei Zhang, Huan Li, Hai-chao Guo, Shi-jie He, Xiao-kang Guo

Proceedings Volume 10153, 1015316 (2016) https://doi.org/10.1117/12.2247342

KEYWORDS: Ranging, Pulsed laser operation, Optical filters

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Narrow pulse laser ranging achieves long-range target detection using laser pulse with low divergent beams. Pulse laser ranging is widely used in military, industrial, civil, engineering and transportation field. In this paper, an improved narrow pulse laser ranging algorithm is studied based on the high speed sampling. Firstly, theoretical simulation models have been built and analyzed including the laser emission and pulse laser ranging algorithm. An improved pulse ranging algorithm is developed. This new algorithm combines the matched filter algorithm and the constant fraction discrimination (CFD) algorithm. After the algorithm simulation, a laser ranging hardware system is set up to implement the improved algorithm. The laser ranging hardware system includes a laser diode, a laser detector and a high sample rate data logging circuit. Subsequently, using Verilog HDL language, the improved algorithm is implemented in the FPGA chip based on fusion of the matched filter algorithm and the CFD algorithm. Finally, the laser ranging experiment is carried out to test the improved algorithm ranging performance comparing to the matched filter algorithm and the CFD algorithm using the laser ranging hardware system. The test analysis result demonstrates that the laser ranging hardware system realized the high speed processing and high speed sampling data transmission. The algorithm analysis result presents that the improved algorithm achieves 0.3m distance ranging precision. The improved algorithm analysis result meets the expected effect, which is consistent with the theoretical simulation.

Proceedings Article | 19 October 2016 Paper

High speed sampling circuit design for pulse laser ranging

Rui-hai Qian, Xuan-yi Gao, Yan-mei Zhang, Huan Li, Hai-chao Guo, Xiao-kang Guo, Shi-jie He

Proceedings Volume 10153, 101531A (2016) https://doi.org/10.1117/12.2247533

KEYWORDS: Pulsed laser operation, Ranging, Laser development

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In recent years, with the rapid development of digital chip, high speed sampling rate analog to digital conversion chip can be used to sample narrow laser pulse echo. Moreover, high speed processor is widely applied to achieve digital laser echo signal processing algorithm. The development of digital chip greatly improved the laser ranging detection accuracy. High speed sampling and processing circuit used in the laser ranging detection system has gradually been a research hotspot. In this paper, a pulse laser echo data logging and digital signal processing circuit system is studied based on the high speed sampling. This circuit consists of two parts: the pulse laser echo data processing circuit and the data transmission circuit. The pulse laser echo data processing circuit includes a laser diode, a laser detector and a high sample rate data logging circuit. The data transmission circuit receives the processed data from the pulse laser echo data processing circuit. The sample data is transmitted to the computer through USB2.0 interface. Finally, a PC interface is designed using C# language, in which the sampling laser pulse echo signal is demonstrated and the processed laser pulse is plotted. Finally, the laser ranging experiment is carried out to test the pulse laser echo data logging and digital signal processing circuit system. The experiment result demonstrates that the laser ranging hardware system achieved high speed data logging, high speed processing and high speed sampling data transmission.

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