本文關(guān)鍵詞： 諧振式光纖陀螺 偏振誤差 低頻調(diào)制 鎖定控制　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：諧振式光纖陀螺(RFOG)的研究已經(jīng)有幾十年的歷史,但一直以來都處于實(shí)驗(yàn)室研究階段,在工程上可行的實(shí)現(xiàn)方案往往太過復(fù)雜而使系統(tǒng)顯得龐大,而簡單的實(shí)現(xiàn)方案其性能指標(biāo)往往達(dá)不到實(shí)用性要求。諧振式光纖陀螺與干涉式光纖陀螺(IFOG)相比,其優(yōu)點(diǎn)是只需要幾十分之一的光纖長度即可實(shí)現(xiàn)相同的散粒噪聲極限靈敏度,與之相關(guān)的諧振式微光陀螺(RMOG)由于能夠光學(xué)集成,在系統(tǒng)小型化方面具有巨大潛力,因此相關(guān)課題的研究具有重要的意義和價(jià)值。在本文描述的實(shí)驗(yàn)平臺上,通過選取合適參數(shù)的光學(xué)器件,構(gòu)造出調(diào)制頻率在20kHz~30kHz附近的諧振腔結(jié)構(gòu),與傳統(tǒng)的數(shù)百kHz甚至MHz級別調(diào)制頻率的結(jié)構(gòu)相比,這種結(jié)構(gòu)由于較窄的諧振線寬,而具有更高的散粒噪聲探測靈敏度,存在一定的潛在價(jià)值。由于當(dāng)前激光器線寬級別限制或相位噪聲的影響,更窄的諧振線寬在當(dāng)前技術(shù)機(jī)理下難以實(shí)現(xiàn)環(huán)路鎖定,從而不具有研究的可行性。研究的內(nèi)容包括:(1)給定器件參數(shù)條件下基本參數(shù)的計(jì)算和測定,包括系統(tǒng)白噪聲影響下的實(shí)際線寬,環(huán)路特征頻率和纖細(xì)度,調(diào)制解調(diào)方案相關(guān)參數(shù)等;(2)理論分析由于器件特性、器件加工以及偏振特性引入的影響Sagnac相移的各種光學(xué)噪聲;(3)理論分析并實(shí)驗(yàn)驗(yàn)證環(huán)路鎖定的反饋控制相關(guān)原理和參數(shù),提出一定準(zhǔn)則下存在最優(yōu)的PI參數(shù)組合,且具有較大的魯棒性;(4)通過高頻調(diào)制的方案精確測定了諧振腔的自由譜寬。
[Abstract]:The research of resonant fiber optic gyroscope (RFOG) has a history of several decades, but it has been in the laboratory research stage all the time. The feasible project in engineering is too complicated to make the system appear huge. The performance of the simple scheme is often not up to the practical requirements. The resonant fiber optic gyroscope (Rfog) is compared with the interferometric fiber optic gyroscope (IFOG). The advantage of RMOG is that it requires only a fraction of the fiber length to achieve the same shot noise limit sensitivity, which is associated with the resonant LLL gyroscope (RMOG) because of its optical integration. It has great potential in the miniaturization of the system, so the research of related topics has important significance and value. On the experimental platform described in this paper, by selecting the appropriate parameters of optical devices. The resonant cavity structure with modulation frequency of 20kHz ~ 30kHz is constructed. Compared with the traditional structure of hundreds of kHz and even MHz modulation frequency, this structure is due to narrower resonant linewidth. But it has higher detection sensitivity of granular noise, which has some potential value, because of the current laser linewidth limit or the effect of phase noise. The narrower resonant linewidth is difficult to realize the loop locking under the current technical mechanism, so it is not feasible to study. The research content includes the calculation and measurement of the basic parameters under the given device parameters. Including the actual line width under the influence of system white noise, loop characteristic frequency and fineness, modulation and demodulation scheme related parameters and so on; (2) A theoretical analysis of various optical noises that influence the phase shift of Sagnac due to the characteristics of the device, device fabrication and polarization characteristics; (3) theoretical analysis and experimental verification of the feedback control theory and parameters of loop locking are carried out, and the optimal Pi parameter combination under certain criteria is proposed, and it is robust. The free spectrum width of the resonator is accurately measured by the scheme of high frequency modulation.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN96

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