LABORATORY EVALUATION OF LOADING SYSTEM BASED ON FIBER OPTICAL MACH-ZEHNDER INTERFEROMETER AND BLUETOOTH LOW ENERGY WIRELESS SENSOR

實驗室評估結合光纖馬赫－詹德干涉儀和藍芽低功耗無線感測器之荷載系統

Jian-Neng Wang(王劍能) ； Qiu-Ming Zhao(趙秋銘)

《中國土木水利工程學刊》 34卷8期 (2022/12) Pp. 671-678

https://doi.org/10.6652/JoCICHE.202212_34(8).0002

摘要

This paper presents a preliminary study of laboratory evaluation of loading system using fiber optical Mach-Zehnder Interferometer (MZI) and Bluetooth low energy wireless sensor technologies. The proposed loading system is based on a cantilever beam mechanism, where both home-made 4-cm and 5-cm fiber optic MZIs were used to measure different loading conditions and the Bluetooth low energy wireless sensor was glued on the surface of fixed end support to detect the constraint status. We have conducted 30 times for this cantilever beam loading system experiment using fiber optical Mach-Zehnder interferometers and Bluetooth low energy wireless sensing system. According the optical spectra of 4-cm and 5-cm MZIs, the experimental results show a linear inverse proportional relationship (adjusted R-square = 0.99984 and 0.99324, respectively) between wavelength shift of first peak and different loading conditions. Hopefully, the findings of this study can be further utilized to monitor the traffic loading for asphalt roadways or parking lots using the proposed fiber optical Mach-Zehnder Interferometer and Bluetooth low energy wireless sensor loading system.

關鍵字

load ； Mach-Zander interferometer ； optical fiber ； Bluetooth ； low energy wireless sensor ； wavelength shift

並列摘要

本文運用光纖馬赫－詹德干涉儀和藍芽低功耗無線感測器技術於實驗室評估荷載系統。我們提出的荷載系統是基於懸臂梁機制結合自製的光纖馬赫－詹德干涉儀量測不同的荷載狀況，並運用藍芽低功耗無線感測器黏貼於固定端並確認符合束限狀態。對此光纖馬赫－詹德干涉儀和藍芽低功耗無線感測器之懸臂梁荷載系統持續進行了30次實驗。4公分與5公分的干涉儀光譜圖結果顯示，第一個峰值的波長飄移與荷載間存在線性反比關係（修正後判定係數=0.99984與0.99324），因此結合光纖馬赫－詹德干涉儀與藍芽低功耗無線感測器之荷載系統是可行的。

並列關鍵字

荷載 ； 光纖 ； 馬赫－詹德干涉儀 ； 藍芽 ； 低功耗無線感測器 ； 波長飄移

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