Dr. Liping Tian Profile

Dr. Liping Tian

at Jinling Institute of Technology

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Proceedings Article | 28 February 2021 Paper

An experimental study on the characteristics of a bionic optical fiber

L. B. Shen, L. P. Tian

Proceedings Volume 11781, 117810A (2021) https://doi.org/10.1117/12.2591306

KEYWORDS: Optical fibers, Biomimetics, Composites, Quartz, Light sources, Optical power meters, Liquids, Light

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At present, there are many kinds of composite damage self-repair methods, including non-intrinsic self-repair methods such as thermoplastic materials, microcapsules, hollow fibers, blood vessels, nanofibers and carbon nanotubes. However, none of these self-repairing methods can realize the occurrence of perceptual damage. Therefore, this paper proposes a bionic fiber, which has the functions of sensing and repairing damage simultaneously. In the process of developing bionic fiber, we choose quartz glass as the cladding material of bionic fiber, the light curing agent as the fiber core, and the plastic fiber with matching diameters as the light window to close the two ends of bionic fiber. We carried out experimental research on the fiber. Firstly, the micro-load for bionic fiber is carried out to study its micro-bending characteristics. And, the bionic fiber is damaged (micro-crack) by adding load, and the self-repair efficiency of the biomimetic fiber is studied by comparing the output optical power of the biomimetic fiber before and after the damage. Experimental results show that the bionic fiber has certain sensing and self-repairing functions, and its repair efficiency is about 40%, and the repair rate is fast. In order to make up for the large loss of bionic fiber, short bionic optical fiber can be used as the repair element in practical application, and the plastic optical fiber can be used to close the Windows at both ends and the bionic optical fiber part to form the sensing element. Therefore, the proposal of bionic fiber in this paper provides a new way and method for the application of composite material health monitoring and damage self-repair, and also provides an experimental basis for the application research of bionic fiber in intelligent composite material structure.

Proceedings Article | 19 November 2019 Paper

Study on the tail in TDOE of the coated MCP-PMT and its suppression

Lin Chen, Xingchao Wang, Jinshou Tian, Lixing Fan, Liping Tian, Lingbin Shen

Proceedings Volume 11184, 111840W (2019) https://doi.org/10.1117/12.2537851

KEYWORDS: Microchannel plates, 3D modeling, Yield improvement

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Depositing a high secondary electron yield (SEY) film on the microchannel plate (MCP) input electrode is supposed to be an effective approach to improve the photoelectron collection efficiency (CE) of photomultiplier tubes based on MCPs (MCP-PMTs). Nevertheless, secondaries promoted by the photoelectrons striking the MCP input face may cause a long tail in the time distribution of the output electrons (TDOE). In our work, laying a conductive grid upon the MCPs is proposed as an effective approach to suppress the tail. A three-dimensional MCP-PMT model is developed in CST STUDIO SUITE to systematically investigate the dependence of the TDOE on the applied voltage (U) of the grid at the coated material SEY=6. Simulation results show that high voltage applied on the grid could suppress the delay pulse effectively. The optimal U is above 500 V.

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