本文關(guān)鍵詞：基于法拉第效應(yīng)的正交雙頻光纖激光磁場傳感器的敏感特性研究　出處：《暨南大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 激光技術(shù) 光纖傳感器 法拉第效應(yīng) 光纖光柵激光器 磁場傳感器

【摘要】：磁場的測量在各個領(lǐng)域如導航、電流檢測、空間和地球物理研究等都有廣泛的應(yīng)用。全光纖磁場傳感器因其具有重量輕、體積小和帶寬窄等優(yōu)勢而備受矚目。光纖磁場傳感器是以光纖器件作為敏感元件,通過借助相位、偏振態(tài)、幅度、波長等參量的變化量實現(xiàn)對磁場的測量的一類傳感器。實現(xiàn)全光纖磁場傳感器的原理有多種,例如法拉第效應(yīng)、磁致伸縮效應(yīng)、洛倫茲力和磁流體材料等等,其中法拉第效應(yīng)由于可以實現(xiàn)對磁場的直接測量而廣受歡迎。近年來,如何發(fā)展能夠具有高靈敏度、高探測精度、大動態(tài)范圍特點的新型光纖磁場傳感器件成為了光纖傳感領(lǐng)域的研究熱點。本文主要內(nèi)容如下:1.DBR(分布式布拉格反射)正交雙頻光纖激光器的研制。采用相位掩膜法,利用193nm Ar F準分子激光器在單摻鉺光纖上刻寫與模板波長對應(yīng)的光纖光柵,制備出輸出正交雙偏振的單縱模DBR光纖光柵激光器。DBR光纖光柵激光器為光纖磁場傳感器提供射頻域的檢測信號。2.利用法拉第效應(yīng),正交雙偏振光纖激光器已被證明可用來實現(xiàn)靈活小巧的磁場傳感器。為了發(fā)展適宜的封裝結(jié)構(gòu)以優(yōu)化對磁場的傳感靈敏度,提出了基于法拉第效應(yīng)的正交雙頻光纖激光磁場傳感器的縱向空間響應(yīng)的測量。此外對傳感器的磁場傳感機理進行了分析,推導出在磁場中縱向空間響應(yīng)與DBR光纖光柵激光器的關(guān)系。3.進行了磁場傳感增強增敏性研究。通過旋轉(zhuǎn)熔接法的增敏結(jié)構(gòu)用以實驗,這種方法可以引發(fā)快慢軸方向上相位差的減小,使得偏振態(tài)的光程差相互部分抵消,進而使輸出拍頻信號的頻率得到降低。結(jié)合之前的實驗及理論推導,可以使得光纖激光器的傳感靈敏度得到進一步的提高。最后,對論文所做的內(nèi)容作了簡要的總結(jié),對基于法拉第效應(yīng)的光纖磁場傳感器的進一步發(fā)展與應(yīng)用作了展望。
[Abstract]:Magnetic field measurement has been widely used in many fields, such as navigation, current detection, space and geophysical research, etc. All optical fiber magnetic sensor is light because of its light weight. Optical fiber magnetic sensor is based on the optical fiber device as the sensitive element, through the help of phase, polarization state, amplitude. All optical fiber magnetic sensors have many principles, such as Faraday effect, magnetostrictive effect, Lorentz force and magnetic fluid materials. Faraday effect is popular because of its direct measurement of magnetic field. In recent years, how to develop high sensitivity and high detection accuracy. A novel optical fiber magnetic sensing device with large dynamic range has become a hotspot in the field of optical fiber sensing. The main contents of this paper are as follows: 1. DBR (distributed Bragg reflection). Development of orthogonal Dual-Frequency Fiber Laser. Phase mask method is used. A 193nm ar F excimer laser is used to write a fiber grating corresponding to the template wavelength on a single erbium-doped fiber. Single longitudinal mode DBR fiber grating laser with output orthogonal double polarization. DBR fiber grating laser provides RF detection signal for fiber magnetic sensor. 2. Using Faraday effect. Orthogonal double-polarization fiber lasers have been proved to be used to realize flexible and compact magnetic field sensors. In order to develop a suitable packaging structure to optimize the sensitivity to the magnetic field. The longitudinal spatial response of orthogonal dual-frequency fiber laser magnetic field sensor based on Faraday effect is proposed. In addition, the magnetic field sensing mechanism of the sensor is analyzed. The relationship between longitudinal spatial response in magnetic field and DBR fiber grating laser is deduced. The enhancement of sensitivity by magnetic field sensing is studied. This method can cause the decrease of phase difference in the direction of fast axis and slow axis, make the optical path difference of polarization state cancel each other, and then reduce the frequency of the output beat frequency signal. Combined with the previous experiments and theoretical derivation. The sensor sensitivity of fiber laser can be further improved. Finally, the content of this paper is summarized briefly. The further development and application of fiber optic magnetic field sensor based on Faraday effect are prospected.
【學位授予單位】：暨南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TP212;TN248

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