Mr. Zhenzhong Fan Profile

Zhenzhong Fan

at China Academy of Railway Sciences

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Publications (2)

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Proceedings Article | 12 March 2021 Paper

Study on photoelastic imaging technology of ultrasonic guided wave in rails for high speed railway

Zhenzhong Fan, Lu Bai

Proceedings Volume 11763, 117637Q (2021) https://doi.org/10.1117/12.2587468

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Ultrasonic guided wave inspection is considered to detect flaw effectively in rails for high-speed railway and simultaneously it can be used for SHM(structure health monitor). the propagation process of ultrasonic in the railway turnout is complex. In order to make the guided waves become visible and people can observe complicated Ultrasonic field directly, according to the Maxwell law of stress-optic refraction, polarized light interference method is employed for establishing the dynamic photoelastic imaging system, and the bottom of the switch rail and rail waist variable cross-section optical test block with K9 optical glass material are designed and produced. Choosing different probes, research of different probes to excite guided wave in the test block in the sound field is carried on. Using CCD shooting test block, guided wave sound field images through the computer software are taken for acquisition and analysis. The sound field visualization is implemented, which can be used to guide ultrasonic guided wave inspection in practice.

Proceedings Article | 7 August 2015 Paper

Application of multi-channel photoelastic imaging technology in array type ultrasonic nondestructive testing

Zhen-zhong Fan, Chao Bi

Proceedings Volume 9623, 96230K (2015) https://doi.org/10.1117/12.2185783

KEYWORDS: Ultrasonics, Photoelasticity, Acoustics, Imaging systems, Phased arrays, Control systems, Glasses, Nondestructive evaluation, Phased array optics, Interfaces

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With the rapid development of modern nondestructive testing technologies, ultrasonic phased array and Ultrasonic array testing technology has been used widely, at the same time the propagation process of ultrasonic in the material becomes more and more complex. In order to make the ultrasonic propagation path become visible and researchers can observe the acoustic field directly, considering the properties of the ultrasonic as a stress wave, according to the theory of polarized light interference, a multi-channel dynamic photoelastic imaging system is developed successfully. The system can generate many kinds of focusing ultrasonic fields in optical specimen by controlling the ultrasonic transmission delay time of each equipment channel, and the system has the ability to simulate the acoustic field’s focusing process of the ultrasonic phased array. The image shot by CCD camera reflects the propagation process of the acoustic field in the specimen, and the dynamic video is formed under control of the timing circuit, and the system has the ability to save the captured image in the computer.

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