遠(yuǎn)紅外三色激光器穩(wěn)頻系統(tǒng)研究
發(fā)布時(shí)間：2018-10-08 12:33
【摘要】：受控核聚變以其清潔無(wú)污染,地球上原料儲(chǔ)備巨大,且能產(chǎn)生巨大能量的特點(diǎn),被認(rèn)為是解決人類未來(lái)能源問(wèn)題的主要途徑。實(shí)現(xiàn)受控核聚變的方式主要有兩種:磁約束和慣性約束。在各種磁約束聚變裝置中,托卡馬克(Tokamak)發(fā)展最為成熟,也是最有希望成為未來(lái)聚變反應(yīng)堆的一種約束結(jié)構(gòu)。核聚變內(nèi)部溫度高達(dá)1億度,是一種高溫等離子體。電子數(shù)密度是等離子體的重要參數(shù),電子數(shù)密度分布和磁場(chǎng)分布信息是控制托卡馬克放電狀態(tài)的重要依據(jù)。在中科院等離子體物理研究所的托卡馬克裝置上,采用了遠(yuǎn)紅外激光偏振干涉儀測(cè)量電子數(shù)密度。在該實(shí)驗(yàn)中,中頻頻率的穩(wěn)定性對(duì)于獲得穩(wěn)定、可靠的實(shí)驗(yàn)數(shù)據(jù)至關(guān)重要,而現(xiàn)有的主動(dòng)激光穩(wěn)頻技術(shù)并不適用于遠(yuǎn)紅外激光偏振干涉儀的中頻頻率的穩(wěn)定控制。本論文從該測(cè)量方法的理論出發(fā),分析了中頻信號(hào)頻率的穩(wěn)定性對(duì)測(cè)量電子數(shù)密度和磁場(chǎng)分布以及托卡馬克放電狀態(tài)實(shí)時(shí)控制重要性,提出了一套完整的激光中頻頻率穩(wěn)定性控制方案,即中頻信號(hào)通過(guò)帶通濾波器濾波、電壓比較器整形后轉(zhuǎn)化成同頻方波信號(hào),并送入以ARM(Advanced RISC Machines)處理器為核心的數(shù)字處理系統(tǒng)中,計(jì)算中頻頻率的當(dāng)前值,通過(guò)PID算法產(chǎn)生控制電壓,改變激光器壓電陶瓷的長(zhǎng)度,從而調(diào)整中頻頻率以一定的精度維持在期望值附近。此方法具有中頻頻率可在一定范圍內(nèi)人為設(shè)定的特點(diǎn),適用于測(cè)量托卡馬克內(nèi)部電子數(shù)密度和磁場(chǎng)分布信息的遠(yuǎn)紅外激光偏振干涉儀中頻頻率的穩(wěn)定控制。在此基礎(chǔ)上,本論文應(yīng)用此控制方案制作出了穩(wěn)頻控制器,對(duì)中頻信號(hào)頻率控制進(jìn)行了現(xiàn)場(chǎng)調(diào)試,對(duì)控制前后的中頻信號(hào)的頻率變化做了對(duì)比性分析,結(jié)果表明該控制方法及其系統(tǒng)能夠很好地實(shí)現(xiàn)中頻頻率的穩(wěn)定控制。
[Abstract]:Controlled nuclear fusion is considered to be the main way to solve the future energy problem of mankind because of its clean and pollution-free characteristics, the huge reserves of raw materials on the earth, and the ability to produce huge energy. There are two main ways to realize controlled nuclear fusion: magnetic confinement and inertial confinement. Among all kinds of magnetically confined fusion devices, Tokamak (Tokamak) is the most mature and promising confinement structure for future fusion reactors. The internal temperature of nuclear fusion is 100 million degrees, which is a kind of high temperature plasma. Electron number density is an important parameter of plasma. The information of electron number density distribution and magnetic field distribution is an important basis to control the discharge state of Tokamak. The electron number density was measured by far infrared laser polarization interferometer in Tokamak device of Institute of Plasma Physics of the Chinese Academy of Sciences. In this experiment, the stability of if frequency is very important to obtain stable and reliable experimental data, but the existing active laser frequency stabilization technique is not suitable for the stability control of if frequency of far infrared laser polarization interferometer. Based on the theory of this measurement method, the importance of the stability of intermediate frequency signal frequency to the measurement of electron density, magnetic field distribution and real time control of Tokamak discharge state is analyzed in this paper. In this paper, a complete control scheme of laser intermediate frequency stability is proposed, that is, if signal is filtered by band-pass filter and converted into the same frequency square wave signal after shaping by voltage comparator, and it is sent to the digital processing system with ARM (Advanced RISC Machines) processor as the core. The current value of if frequency is calculated, the control voltage is generated by PID algorithm, the length of piezoelectric ceramics of laser is changed, and the if frequency is adjusted to maintain the expected value with certain precision. This method has the characteristic that if frequency can be set artificially in a certain range. It is suitable for the stability control of if frequency of far-infrared laser polarization interferometer which can measure the electron number density and magnetic field distribution information in Tokamak. On this basis, this paper uses the control scheme to make the frequency stabilization controller, debugging the if signal frequency control on the spot, and making a comparative analysis on the frequency change of the intermediate frequency signal before and after the control. The results show that the control method and its system can achieve the stable control of if frequency.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248;TL631.24
[Abstract]:Controlled nuclear fusion is considered to be the main way to solve the future energy problem of mankind because of its clean and pollution-free characteristics, the huge reserves of raw materials on the earth, and the ability to produce huge energy. There are two main ways to realize controlled nuclear fusion: magnetic confinement and inertial confinement. Among all kinds of magnetically confined fusion devices, Tokamak (Tokamak) is the most mature and promising confinement structure for future fusion reactors. The internal temperature of nuclear fusion is 100 million degrees, which is a kind of high temperature plasma. Electron number density is an important parameter of plasma. The information of electron number density distribution and magnetic field distribution is an important basis to control the discharge state of Tokamak. The electron number density was measured by far infrared laser polarization interferometer in Tokamak device of Institute of Plasma Physics of the Chinese Academy of Sciences. In this experiment, the stability of if frequency is very important to obtain stable and reliable experimental data, but the existing active laser frequency stabilization technique is not suitable for the stability control of if frequency of far infrared laser polarization interferometer. Based on the theory of this measurement method, the importance of the stability of intermediate frequency signal frequency to the measurement of electron density, magnetic field distribution and real time control of Tokamak discharge state is analyzed in this paper. In this paper, a complete control scheme of laser intermediate frequency stability is proposed, that is, if signal is filtered by band-pass filter and converted into the same frequency square wave signal after shaping by voltage comparator, and it is sent to the digital processing system with ARM (Advanced RISC Machines) processor as the core. The current value of if frequency is calculated, the control voltage is generated by PID algorithm, the length of piezoelectric ceramics of laser is changed, and the if frequency is adjusted to maintain the expected value with certain precision. This method has the characteristic that if frequency can be set artificially in a certain range. It is suitable for the stability control of if frequency of far-infrared laser polarization interferometer which can measure the electron number density and magnetic field distribution information in Tokamak. On this basis, this paper uses the control scheme to make the frequency stabilization controller, debugging the if signal frequency control on the spot, and making a comparative analysis on the frequency change of the intermediate frequency signal before and after the control. The results show that the control method and its system can achieve the stable control of if frequency.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248;TL631.24
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