Vibration measurement by projection of phase-modulated and amplitude-modulated structured light

Q3 Engineering

Journal of Applied Research and Technology Pub Date : 2023-02-27 DOI:10.22201/icat.24486736e.2023.21.1.1076

E. Barbosa, Luiz Felipe Gonçalves Dib, Marlene Correa Henrique, M. T. Saita

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引用次数: 0

Abstract

Most of the whole-field optical methods for vibration measurement have low sensitivity when the points of the studied surface vibrate with the same amplitude. Those techniques also usually require complex and/or expensive solutions which are difficult to implement in engineering processes when the vibration amplitudes are relatively high. In order to overcome those limitations we propose a method for out-of-plane vibration measurement which uses structured light projection. The vibrating surface is obliquely illuminated by straight and parallel interference fringes produced by a Twyman-Green interferometer with a 532-nm laser as light source. In order to enable fringe visualization two techniques were employed, namely, the phase modulation of the fringe pattern by using a vibrating mirror in the interferometer, and a stroboscopic illumination by using a Fabry-Perot etalon amplitude modulator. We demonstrated the technique by measuring the vibration amplitudes of small objects in the millimeter and submillimeter range.

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相位调制和振幅调制结构光投影振动测量

当研究表面的点以相同的振幅振动时，大多数用于振动测量的全场光学方法的灵敏度较低。这些技术通常还需要复杂和/或昂贵的解决方案，当振动幅度相对高时，这些解决方案难以在工程过程中实施。为了克服这些限制，我们提出了一种使用结构光投影的平面外振动测量方法。以532nm激光为光源的Twyman-Green干涉仪产生的直干涉条纹和平行干涉条纹倾斜照射振动表面。为了实现条纹可视化，采用了两种技术，即通过在干涉仪中使用振动镜对条纹图案进行相位调制，以及通过使用Fabry-Perot标准具振幅调制器进行频闪照明。我们通过测量毫米和亚毫米范围内的小物体的振幅来演示这项技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Research and Technology 工程技术-工程：电子与电气

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Applied Research and Technology (JART) is a bimonthly open access journal that publishes papers on innovative applications, development of new technologies and efficient solutions in engineering, computing and scientific research. JART publishes manuscripts describing original research, with significant results based on experimental, theoretical and numerical work. The journal does not charge for submission, processing, publication of manuscripts or for color reproduction of photographs. JART classifies research into the following main fields: -Material Science: Biomaterials, carbon, ceramics, composite, metals, polymers, thin films, functional materials and semiconductors. -Computer Science: Computer graphics and visualization, programming, human-computer interaction, neural networks, image processing and software engineering. -Industrial Engineering: Operations research, systems engineering, management science, complex systems and cybernetics applications and information technologies -Electronic Engineering: Solid-state physics, radio engineering, telecommunications, control systems, signal processing, power electronics, electronic devices and circuits and automation. -Instrumentation engineering and science: Measurement devices (pressure, temperature, flow, voltage, frequency etc.), precision engineering, medical devices, instrumentation for education (devices and software), sensor technology, mechatronics and robotics.