基于磁流體包覆復(fù)合光纖光柵的磁場(chǎng)傳感器研究
發(fā)布時(shí)間：2018-10-23 15:05
【摘要】：隨著物聯(lián)網(wǎng)應(yīng)用的蓬勃發(fā)展,當(dāng)前研究人員正在采取相關(guān)方法與技術(shù)不斷提高智能化產(chǎn)品與設(shè)備的設(shè)計(jì)系統(tǒng)的性能。光纖光柵傳感器由于抗干擾、測(cè)量精度高、體積小、響應(yīng)靈敏等優(yōu)點(diǎn),其傳感機(jī)理和結(jié)構(gòu)設(shè)計(jì)得到越來越多的科研人員關(guān)注和研究。本文將復(fù)合光纖光柵與磁流體的特性相結(jié)合,提出磁場(chǎng)傳感測(cè)量的設(shè)計(jì)計(jì)劃與方案。主要圍繞減小包層直徑的布拉格光纖光柵、傾斜長周期光纖光柵和普通長周期光纖光柵級(jí)聯(lián)多模光纖等結(jié)構(gòu),結(jié)合磁流體在不同磁場(chǎng)強(qiáng)度下具有折射率可調(diào)諧特性,就其在光纖磁場(chǎng)傳感中的應(yīng)用進(jìn)行了深入的理論和實(shí)驗(yàn)研究。本文主要工作如下:(1)提出一種基于磁流體包覆減小包層直徑的布拉格光纖光柵的磁場(chǎng)傳感器,通過腐蝕特意改變布拉格光柵的包層直徑,使得光纖中的基模模式與環(huán)境介質(zhì)相互作用,并且從布拉格光柵諧振峰和包層模式諧振峰進(jìn)行實(shí)驗(yàn)和分析,得到波長漂移量與磁場(chǎng)強(qiáng)度大小有很好的響應(yīng)關(guān)系。(2)利用高頻CO2激光器寫制傾斜長周期光纖光柵,該光纖光柵不僅能夠?qū)⒐鈴睦w芯模耦合到同向傳輸?shù)陌鼘幽Ｖ?而且能夠與非對(duì)稱的包層模式發(fā)生耦合。實(shí)驗(yàn)上得到LP0m和LP1m模式分別對(duì)應(yīng)的諧振峰。隨著外界磁場(chǎng)強(qiáng)度變化時(shí),深入研究磁流體包覆時(shí)該結(jié)構(gòu)的光譜特性,其傳輸損耗的變化大小與磁場(chǎng)的強(qiáng)度有很好的線性關(guān)系。(3)利用HF溶液腐蝕并去掉多模光纖(105/125)的包層,并將其與長周期光纖光柵熔接級(jí)聯(lián)。實(shí)現(xiàn)了一種對(duì)溫度和磁場(chǎng)雙參數(shù)同時(shí)測(cè)量的傳感測(cè)量器件。利用長周期光柵的模式耦合與多模光纖的干涉這兩種不同耦合機(jī)制獲得雙參數(shù)傳感矩陣,其能夠有效解決磁場(chǎng)傳感時(shí)存在的溫度交叉干擾問題,并從傳感機(jī)理進(jìn)行深入研究。該器件能夠有效解決磁場(chǎng)傳感時(shí)存在的溫度交叉干擾問題,同時(shí)得到對(duì)寬范圍磁場(chǎng)進(jìn)行探測(cè)的傳感特性。
[Abstract]:With the rapid development of Internet of things (IoT) applications, researchers are adopting relevant methods and technologies to improve the performance of intelligent product and equipment design system. Because of the advantages of anti-interference, high measurement precision, small volume and sensitive response, the sensing mechanism and structure design of fiber grating sensor have been paid more and more attention and research by researchers. In this paper, the characteristics of composite fiber grating and magnetic fluid are combined, and the design plan and scheme of magnetic field sensing measurement are put forward. The fiber Bragg gratings with reduced cladding diameter, inclined long-period fiber gratings and ordinary long-period fiber gratings have cascaded multimode fibers, and the magnetic fluid has tunable refractive index characteristics under different magnetic field intensities. Its application in optical fiber magnetic field sensing is studied theoretically and experimentally. The main work of this paper is as follows: (1) A magnetic field sensor based on magnetic fluid coating fiber Bragg grating (FBG) with reduced cladding diameter is proposed. The fundamental mode in the fiber interacts with the ambient medium, and the experiment and analysis are carried out from the Bragg grating resonant peak and the cladding mode resonant peak. It is found that the wavelength drift has a good response to the magnetic field intensity. (2) the inclined long-period fiber grating is fabricated by using a high-frequency CO2 laser. The fiber grating can not only couple the light from the core mode to the cladding mode in the same direction. And it can be coupled with asymmetric cladding model. The resonance peaks corresponding to LP0m and LP1m modes are obtained experimentally. With the change of magnetic field intensity, the spectral characteristics of the structure are studied in depth. The change of transmission loss is linearly related to the intensity of magnetic field. (3) the cladding layer of multimode fiber (105 / 125) is corroded and removed by HF solution. And it is fused with long period fiber grating in cascade. A sensor device for simultaneous measurement of two parameters of temperature and magnetic field is realized. Two-parameter sensing matrix is obtained by using two different coupling mechanisms of long-period grating mode coupling and multi-mode fiber interference. It can effectively solve the problem of temperature cross-interference in magnetic field sensing, and the sensing mechanism is deeply studied. The device can effectively solve the problem of cross-interference of temperature in magnetic field sensing, and obtain the sensing characteristics of detecting wide magnetic field at the same time.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253
本文編號(hào)：2289600
[Abstract]:With the rapid development of Internet of things (IoT) applications, researchers are adopting relevant methods and technologies to improve the performance of intelligent product and equipment design system. Because of the advantages of anti-interference, high measurement precision, small volume and sensitive response, the sensing mechanism and structure design of fiber grating sensor have been paid more and more attention and research by researchers. In this paper, the characteristics of composite fiber grating and magnetic fluid are combined, and the design plan and scheme of magnetic field sensing measurement are put forward. The fiber Bragg gratings with reduced cladding diameter, inclined long-period fiber gratings and ordinary long-period fiber gratings have cascaded multimode fibers, and the magnetic fluid has tunable refractive index characteristics under different magnetic field intensities. Its application in optical fiber magnetic field sensing is studied theoretically and experimentally. The main work of this paper is as follows: (1) A magnetic field sensor based on magnetic fluid coating fiber Bragg grating (FBG) with reduced cladding diameter is proposed. The fundamental mode in the fiber interacts with the ambient medium, and the experiment and analysis are carried out from the Bragg grating resonant peak and the cladding mode resonant peak. It is found that the wavelength drift has a good response to the magnetic field intensity. (2) the inclined long-period fiber grating is fabricated by using a high-frequency CO2 laser. The fiber grating can not only couple the light from the core mode to the cladding mode in the same direction. And it can be coupled with asymmetric cladding model. The resonance peaks corresponding to LP0m and LP1m modes are obtained experimentally. With the change of magnetic field intensity, the spectral characteristics of the structure are studied in depth. The change of transmission loss is linearly related to the intensity of magnetic field. (3) the cladding layer of multimode fiber (105 / 125) is corroded and removed by HF solution. And it is fused with long period fiber grating in cascade. A sensor device for simultaneous measurement of two parameters of temperature and magnetic field is realized. Two-parameter sensing matrix is obtained by using two different coupling mechanisms of long-period grating mode coupling and multi-mode fiber interference. It can effectively solve the problem of temperature cross-interference in magnetic field sensing, and the sensing mechanism is deeply studied. The device can effectively solve the problem of cross-interference of temperature in magnetic field sensing, and obtain the sensing characteristics of detecting wide magnetic field at the same time.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253
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