一種新型RBOTDA傳感系統(tǒng)的研究
發(fā)布時(shí)間：2019-07-10 09:02
【摘要】：本文綜述了分布式布里淵光纖傳感技術(shù)近年來的研究現(xiàn)狀。介紹了基于布里淵散射的分布式光纖傳感技術(shù)中的布里淵光時(shí)域反射(BOTDR)和布里淵光時(shí)域分析(BOTDA)傳感技術(shù)的原理,并分析了傳統(tǒng)的基于瑞利散射的布里淵光時(shí)域分析(RBOTDA)的傳感原理及其特點(diǎn)。對RBOTDA系統(tǒng)中EOM工作點(diǎn)的原理進(jìn)行了分析,并仿真研究了EOM工作在傳輸曲線的谷點(diǎn)與線性點(diǎn)時(shí)各階光強(qiáng)分布情況,得出將EOM的偏置端鎖定在谷點(diǎn)工作點(diǎn)時(shí)得到的1階光波的信噪比最大。因此,提出了兩個(gè)EOM并聯(lián)的結(jié)構(gòu)產(chǎn)生RBOTDA傳感系統(tǒng)所需的含脈沖基底的脈沖光,探測光由基底連續(xù)光產(chǎn)生的瑞利散射提供。提出了一種新型的RBOTDA系統(tǒng)結(jié)構(gòu)。該系統(tǒng)工作在單端,能克服傳統(tǒng)BOTDA雙端接入的缺點(diǎn)。詳細(xì)闡述了新型RBOTDA系統(tǒng)的結(jié)構(gòu),對系統(tǒng)中非本地效應(yīng)的產(chǎn)生機(jī)理進(jìn)行了詳細(xì)的建模分析,并提出了解決非本地效應(yīng)的方法。在傳感過程中使用雙邊帶探測光,有效地補(bǔ)償泵浦耗盡,減少非本地效應(yīng)帶來的失真影響。通過分析平衡檢測器抑制共模噪聲的原理,在檢測端使用平衡探測器,消除共模噪聲的同時(shí)改善系統(tǒng)的信噪比。搭建了RBOTDA實(shí)驗(yàn)系統(tǒng)。實(shí)驗(yàn)結(jié)果表明:布里淵增益譜完好地貼合洛倫茲曲線,非本地效應(yīng)得到了有效的抑制;在2.4km光纖上,室溫25℃下泵浦脈寬50ns時(shí),布里淵頻移為10.867GHz,布里淵線寬約為40.21MHz;對系統(tǒng)進(jìn)行了平衡檢測與非平衡檢測的對比實(shí)驗(yàn)研究和分析,得出平衡檢測輸出的噪聲功率是單獨(dú)stokes或者anti-stokes的2~（1/2）倍,平衡檢測輸出的信噪比提高了2~（1/2）倍;光纖末端布里淵譜中平衡檢測的布里淵頻譜圖與布里淵增益型或損耗型相比頻譜線更平滑,噪聲較小。
文內(nèi)圖片：
圖片說明：谷點(diǎn)調(diào)制后的光譜圖
[Abstract]:In this paper, the research status of distributed Brillouin optical fiber sensing technology in recent years is reviewed. The principle of Brillouin optical time domain reflection (BOTDR) and Brillouin optical time domain analysis (BOTDA) sensing technology based on Brillouin scattering is introduced, and the sensing principle and characteristics of traditional Brillouin optical time domain analysis (RBOTDA) based on Brillouin scattering are analyzed. The principle of EOM working point in RBOTDA system is analyzed, and the distribution of light intensity of each order when EOM works at valley point and linear point of transmission curve is studied by simulation. It is concluded that the signal-to-noise ratio (SNR) of the first order light wave obtained by locking the bias end of EOM at the working point of valley point is the largest. Therefore, two EOM parallel structures are proposed to generate the pulse light with pulse substrate needed by the RBOTDA sensing system, and the detection light is provided by the Rayleigh scattering produced by the continuous light of the substrate. A new RBOTDA system structure is proposed. The system works on a single end and can overcome the shortcomings of traditional BOTDA dual-terminal access. The structure of the new RBOTDA system is described in detail, the mechanism of non-local effect in the system is modeled and analyzed in detail, and the method to solve the non-local effect is put forward. In the sensing process, the bilateral band probe light is used to effectively compensate the pump depletion and reduce the distortion effect caused by the non-local effect. By analyzing the principle of common mode noise suppression by balance detector, the balance detector is used at the detection end to eliminate the common mode noise and improve the signal to noise ratio of the system at the same time. The RBOTDA experimental system is built. The experimental results show that the Brillouin gain spectrum fits the Lorentz curve perfectly and the non-local effect is effectively suppressed. On 2.4km fiber, the Brillouin frequency shifts to 10.867GHz and Brillouin linewidth is about 40.21MHz when pumping pulse width 50ns at room temperature of 25 鈩，
本文編號：2512497
文內(nèi)圖片：
圖片說明：谷點(diǎn)調(diào)制后的光譜圖
[Abstract]:In this paper, the research status of distributed Brillouin optical fiber sensing technology in recent years is reviewed. The principle of Brillouin optical time domain reflection (BOTDR) and Brillouin optical time domain analysis (BOTDA) sensing technology based on Brillouin scattering is introduced, and the sensing principle and characteristics of traditional Brillouin optical time domain analysis (RBOTDA) based on Brillouin scattering are analyzed. The principle of EOM working point in RBOTDA system is analyzed, and the distribution of light intensity of each order when EOM works at valley point and linear point of transmission curve is studied by simulation. It is concluded that the signal-to-noise ratio (SNR) of the first order light wave obtained by locking the bias end of EOM at the working point of valley point is the largest. Therefore, two EOM parallel structures are proposed to generate the pulse light with pulse substrate needed by the RBOTDA sensing system, and the detection light is provided by the Rayleigh scattering produced by the continuous light of the substrate. A new RBOTDA system structure is proposed. The system works on a single end and can overcome the shortcomings of traditional BOTDA dual-terminal access. The structure of the new RBOTDA system is described in detail, the mechanism of non-local effect in the system is modeled and analyzed in detail, and the method to solve the non-local effect is put forward. In the sensing process, the bilateral band probe light is used to effectively compensate the pump depletion and reduce the distortion effect caused by the non-local effect. By analyzing the principle of common mode noise suppression by balance detector, the balance detector is used at the detection end to eliminate the common mode noise and improve the signal to noise ratio of the system at the same time. The RBOTDA experimental system is built. The experimental results show that the Brillouin gain spectrum fits the Lorentz curve perfectly and the non-local effect is effectively suppressed. On 2.4km fiber, the Brillouin frequency shifts to 10.867GHz and Brillouin linewidth is about 40.21MHz when pumping pulse width 50ns at room temperature of 25 鈩，
本文編號：2512497
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