Mr. Zhangli Wu Profile

Zhangli Wu

at Shanghai Univ

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Publications (2)

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Proceedings Article | 24 November 2021 Paper

High-sensitive FBG-based adaptive fiber laser acoustic sensing system

Zhe Gong, Heming Wei, Zhangli Wu, Fufei Pang, Tingyun Wang, Sridhar Krishnaswamy

Proceedings Volume 12065, 120652U (2021) https://doi.org/10.1117/12.2606754

KEYWORDS: Fiber Bragg gratings, Sensors, Signal detection, Fiber lasers, Sensing systems, Fiber optics sensors

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The all-optical fiber-based intelligent sensing system is one key technology for acoustic/ultrasonic structural health monitoring. Damages such as cracking or impact loading in civil, aerospace, and mechanical structures can generate transient ultrasonic waves, which can reveal the structural health condition. Hence, there is a great need to develop a high precision adaptive sensor for large-value strain signals with large frequency range that can extent to several hundred kilohertz in ultrasonic/acoustic sensing. In this work, we explore an intelligent system based on a fiber Bragg grating (FBG) and an erbium-doped fiber amplifier (EDFA), composing as a fiber cavity that offers significant advantages and higher performance in ultrasonic/acoustic sensing applications. The ASE light emitted from the EDFA and reflected by a FBG is amplified in the fiber cavity and coupled out by a 90:10 coupler, which is demodulated by an unbalanced Mach-Zehnder interferometer (MZI) composed by a 2×2 coupler and a 3×3 coupler. As the reflective spectrum of the FBG sensor changes due to excited acoustic waves, the shift of the laser output wavelength is subsequently converted into a corresponding phase change. We theoretically and experimentally calculate the three output signals using a differential cross-multiplication (DCM) algorithm to directly demodulate the wavelength shift of the FBG sensor. The experimental results demonstrate that the proposed FBG acoustic sensing system has high sensitivity and can respond the ultrasonic waves into the hundreds of kilohertz frequency range, which shows a potential for acoustic emission detection in practical applications.

Proceedings Article | 24 November 2021 Paper

3D printed lens on optical fiber tip for imaging applications

Long Han, Heming Wei, Zhangli Wu, Fufei Pang, Tingyun Wang, Sridhar Krishnaswamy

Proceedings Volume 12065, 120651P (2021) https://doi.org/10.1117/12.2605798

KEYWORDS: Optical fibers, Imaging systems, Lithography, Digital micromirror devices, 3D printing, Optics manufacturing, Multimode fibers

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Current lens-based optics is limited in dimensions and shapes due to the fabrication process. With the development of 3D lithography in recent years, the polymer-based lens fabricated by direct laser writing based on two-photon lithography shows unique capabilities compared to those fabricated by traditional methods. It shows advantages such as fast writing speed and high resolution. However, for those tiny delicate structures such as resonators and waveguides, the quality will be losing if the speed is too high, besides, it costs time to fabricate large structures. In this paper, we present a promising three-dimensional microfabrication system based on single-photon polymerization using a digital micromirror device with a UV light source at 390 nm. The designed system has a high resolution and it needs shorter time for fabrication. Here, the lenses with different sizes and curvatures are fabricated directly on a single mode fiber tip, for optical fiber imaging system. The paper presents experiment-details of the design of the single-photon polymerization system, fabrication the optical components on optical fiber tip and the results for imaging applications. We demonstrate the optical design and manufacturing using a DMD-based 3D printer for potential applications for optics, fabrication of biosensor and imaging.

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