本文選題：LAMOST + 多芯光纖　； 參考：《哈爾濱工程大學(xué)》2016年碩士論文

【摘要】：近年來,天文領(lǐng)域逐漸掀起了大樣本光譜巡天的研究熱潮,這使得多目標(biāo)光纖光譜觀測成為研究熱點(diǎn)。本文主要針對(duì)我國的大天區(qū)多目標(biāo)光纖光譜天文望遠(yuǎn)鏡(LAMOSt)所使用的星像傳輸光纖進(jìn)行研究。設(shè)計(jì)了一種新型五芯特種星像傳輸光纖,使其在滿足傳統(tǒng)天文光纖功能的同時(shí)具有星像對(duì)準(zhǔn)功能,以提高LAMOST的光譜獲取效率。本文的主要工作內(nèi)容及成果如下:利用光纖模式耦合理論計(jì)算了用于光譜傳輸?shù)闹餍竞陀糜谳o助對(duì)準(zhǔn)的導(dǎo)星芯之間的能量串?dāng)_。主芯基模和導(dǎo)星芯基模間的能量最大耦合效率為4.6×10-14%。主芯中LP152模和導(dǎo)星芯中LP11模之間的最大能量耦合效率為1.4×10-8%,其它模式間的最大耦合效率更低。兩纖芯間的串?dāng)_不會(huì)對(duì)天文觀測產(chǎn)生不利影響,滿足天文應(yīng)用要求。根據(jù)模式耦合理論計(jì)算了五芯特種星像傳輸光纖的導(dǎo)星芯分別與階躍折射率和漸變折射率分離光纖連接時(shí)的激勵(lì)情況,得到了激勵(lì)系數(shù)與兩光纖間橫向偏移量之間的關(guān)系曲線。與階躍折射率光纖進(jìn)行連接時(shí),激勵(lì)系數(shù)最大可達(dá)90.94%。仿真計(jì)算了 LAMOST系統(tǒng)光斑落在五芯特種星像傳輸光纖端面的情況,得到了各芯中基模激勵(lì)系數(shù)與光斑沿徑向偏移量之間的關(guān)系曲線,證明該光纖在光斑沿徑向偏移100～349μm范圍內(nèi)時(shí)有偏移反饋信號(hào)。利用插管法制備了五芯特種星像傳輸光纖探頭樣品,并用He-Ne激光作為光源測試其對(duì)準(zhǔn)能力,得到各纖芯出射光強(qiáng)灰度值與光斑徑向偏移量之間的關(guān)系曲線。當(dāng)五芯特種星像傳輸光纖探頭在光斑徑向偏移量在-305～-155μm和105～270μm范圍內(nèi)時(shí),導(dǎo)星芯有偏移反饋信號(hào)。在考慮光斑質(zhì)量的情況下,實(shí)驗(yàn)結(jié)果與理論計(jì)算基本相符。
[Abstract]:In recent years, the astronomical field has gradually raised the research upsurge of large sample spectral survey, which makes multi-target optical fiber spectral observation become a research hotspot. In this paper, the satellite image transmission fiber used in the large sky multitarget optical fiber spectral astronomical telescope (LAMOST) is studied. A novel five-core special satellite image transmission fiber is designed, which not only meets the function of traditional astronomical optical fiber, but also has the function of star image alignment, in order to improve the spectral acquisition efficiency of LAMOST. The main contents and results of this paper are as follows: the energy crosstalk between the main core for spectral transmission and the guide core for auxiliary alignment is calculated by using the optical fiber mode coupling theory. The maximum energy coupling efficiency between the core mode and the core mode is 4.6 脳 10 ~ (-14). The maximum energy coupling efficiency between the LP152 mode in the main core and the LP11 mode in the guide core is 1.4 脳 10 ~ (-8), and the maximum coupling efficiency between the other modes is even lower. Crosstalk between the two cores will not adversely affect astronomical observation and meet the requirements of astronomical application. Based on the mode coupling theory, the excitation of the guide core of the five-core special star-image transmission fiber is calculated when it is connected with the step refractive index and the graded refractive index, respectively, and the relation curve between the excitation coefficient and the transverse deviation between the two fibers is obtained. When connecting with step refractive index fiber, the maximum excitation coefficient can be up to 90.94. The simulation results show that the spot of LAMOST system falls on the end face of fiber-optic fiber with five cores of special satellite image transmission, and the relation curve between the fundamental mode excitation coefficient and the radial offset of the spot in each core is obtained. It is proved that the optical fiber has offset feedback signal in the range of 100 ~ 349 渭 m. Five core special satellite image transmission fiber probe samples were prepared by intubation method. The alignment ability of the probe was measured by He-Ne laser as light source. The relationship between the intensity gray value of each core and the radial deviation of the spot was obtained. When the radial deviation of the fiber-optic probe is in the range of -305 ~ 155 渭 m and 10 ~ 5 ~ 270 渭 m, the guide core has an offset feedback signal when the five-core special satellite image transmission fiber probe is in the range of -305 ~ 155 渭 m and 10 ~ 5 渭 m respectively. The experimental results are in good agreement with the theoretical calculation.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH751;TN253

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 吳俊豐;劉志剛;劉力力;劉永梅;嚴(yán)紅紅;;LAMOST光纖單元位置匹配問題研究[J];光學(xué)技術(shù);2014年06期

2 劉志剛;吳俊豐;劉力力;劉永梅;嚴(yán)紅紅;;以前照方式進(jìn)行LAMOST光纖位置檢測的光點(diǎn)提取研究[J];機(jī)械研究與應(yīng)用;2014年03期

3 汪夢欣;陳笑然;羅阿理;宋軼晗;劉力力;;前照條件下LAMOST焦面板光纖單元定位精度檢測系統(tǒng)設(shè)計(jì)[J];天文研究與技術(shù);2014年02期

4 王森;朱冰;;大芯徑光譜傳光光纖焦比退化特性研究[J];光電工程;2011年07期

5 劉志剛;江暉;謝志林;;LAMOST光纖單元定位參數(shù)研究[J];光學(xué)技術(shù);2010年02期

6 董艷;朱冰;;LAMOST傳光光纖的焦比退化特性分析[J];中國科學(xué)技術(shù)大學(xué)學(xué)報(bào);2007年06期

7 柳春郁,余有龍,高應(yīng)俊;單模與多模光纖耦合器的光束合波[J];光學(xué)學(xué)報(bào);2005年06期

相關(guān)博士學(xué)位論文 前4條

1 朱曉亮;波導(dǎo)型微結(jié)構(gòu)光纖與標(biāo)準(zhǔn)光纖的耦合機(jī)理研究[D];哈爾濱工程大學(xué);2010年

2 姚仰光;LAMOST觀測控制系統(tǒng)的建立與測試[D];中國科學(xué)技術(shù)大學(xué);2008年

3 張壘;LAMOST二維光譜數(shù)據(jù)處理方法研究與軟件開發(fā)[D];中國科學(xué)技術(shù)大學(xué);2007年

4 黃鯤;LAMOST觀測控制與數(shù)據(jù)獲取系統(tǒng)的研究[D];中國科學(xué)技術(shù)大學(xué);2007年

相關(guān)碩士學(xué)位論文 前3條

1 馬紅玉;基于HiBi光纖Sagnac環(huán)的可調(diào)諧梳狀濾波器的研究[D];北京交通大學(xué);2010年

2 關(guān)春穎;光子晶體光纖特性分析與結(jié)構(gòu)設(shè)計(jì)[D];哈爾濱工程大學(xué);2004年

3 劉瑞斌;天文用光纖特性研究[D];長春理工大學(xué);2002年

，

本文編號(hào)：2086654