Abstract: This research focuses on a desensitization method to develop a wide-range FBG sensor for extra-large strain monitoring, which is an essential requirement in large scale infrastructures or for some special occasions. Under appropriate hypotheses, the strain transfer distribution of wide-range FBG sensor based on the shear-lag theory is conducted to improve the accuracy of extra-large strain measurements. It is also discussed how the elastic modulus of adhesive layer affects the strain transfer rate. Two prototypes in different monitoring ranges are designed and fabricated by two layers of steel pipe encapsulation. The presented theoretical model is verified by experimental results. Moreover, it is demonstrated that experimentation in regards to the calibration of the wide-range FBG sensor, improved the amplification coefficient up to 2.08 times and 3.88 times, respectively. The static errors are both calculated and analyzed in this experiment. The wide-range FBG strain sensor shows favourable linearity and stability, which is an excellent property of sensors for extra-large strain monitoring.
摘要：本文研究了一種用于超大型應(yīng)變監(jiān)測(cè)的寬范圍光纖光柵傳感器的脫敏方法，這是大型基礎(chǔ)設(shè)施或某些特殊場(chǎng)合的必要要求。在適當(dāng)?shù)募僭O(shè)條件下，利用剪切滯后理論對(duì)大范圍光纖光柵傳感器的應(yīng)變傳遞分布進(jìn)行了研究，以提高超大型應(yīng)變測(cè)量的精度。討論了粘層彈性模量對(duì)應(yīng)變傳遞速率的影響。通過(guò)兩層鋼管封裝，設(shè)計(jì)制作了兩個(gè)不同監(jiān)測(cè)范圍的原型。實(shí)驗(yàn)結(jié)果驗(yàn)證了該理論模型的正確性。此外，實(shí)驗(yàn)表明，在大范圍FBG傳感器的校準(zhǔn)方面，放大系數(shù)分別提高了2.08倍和3.88倍。本實(shí)驗(yàn)對(duì)靜態(tài)誤差進(jìn)行了計(jì)算和分析。寬范圍FBG應(yīng)變傳感器具有良好的線性和穩(wěn)定性，是超大型應(yīng)變監(jiān)測(cè)傳感器的優(yōu)良能。
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Sensors 2019, 19(8), 1851
by Li Sun, Chuang Li, Chunwei Zhang, Tianqi Liang and Zihao Zhao
©本文版權(quán) | This article belongs to the Special Issue Optical Fiber Sensors 2018–2019
