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Fiber optic Michelson interference experimental course towards the cultivation of undergraduates majoring in optical engineering

Abstract

With the development of optical engineering technologies, traditional experimental courses that merely demonstrate theoretical phenomena can no longer meet the demands of optical engineers' education. In this paper, we propose an experimental course 'Fiber-Michelson white light interference experiment' towards the cultivation of optical engineering undergraduates and present a fiber optic system supporting the course. The proposed course integrates fiber optics and optical engineering applications with traditional Michelson interference experimental course, and the experimental system used in the course is low in cost, easy to operate, and convenient to assemble. During the class, students work as groups and have to finish three experimental tasks including the measurements of length, curvature, and refractive index. The first-hand experiences in experiments can impress students with the Michelson optic interference theory and is conductive to developing their abilities to apply optics to engineering. Students' feedbacks are collected by questionnaire, and students recognize the necessity and effectiveness of the course.

article Article

date_range 2023

language English

link Link of the paper

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Zhang Min

Gao Jiaxing

Liu Zhihai

Zhang Yu

Zhang Yaxun

Yang Xinghua

Zhang Jianzhong

Yang Jun

Yuan Libo

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Featured Keywords

experimental course

optical engineering

Michelson interference

education

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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