远红外三色激光器稳频系统研究
发布时间：2018-10-08 12:33
【摘要】：受控核聚变以其清洁无污染,地球上原料储备巨大,且能产生巨大能量的特点,被认为是解决人类未来能源问题的主要途径。实现受控核聚变的方式主要有两种:磁约束和惯性约束。在各种磁约束聚变装置中,托卡马克(Tokamak)发展最为成熟,也是最有希望成为未来聚变反应堆的一种约束结构。核聚变内部温度高达1亿度,是一种高温等离子体。电子数密度是等离子体的重要参数,电子数密度分布和磁场分布信息是控制托卡马克放电状态的重要依据。在中科院等离子体物理研究所的托卡马克装置上,采用了远红外激光偏振干涉仪测量电子数密度。在该实验中,中频频率的稳定性对于获得稳定、可靠的实验数据至关重要,而现有的主动激光稳频技术并不适用于远红外激光偏振干涉仪的中频频率的稳定控制。本论文从该测量方法的理论出发,分析了中频信号频率的稳定性对测量电子数密度和磁场分布以及托卡马克放电状态实时控制重要性,提出了一套完整的激光中频频率稳定性控制方案,即中频信号通过带通滤波器滤波、电压比较器整形后转化成同频方波信号,并送入以ARM(Advanced RISC Machines)处理器为核心的数字处理系统中,计算中频频率的当前值,通过PID算法产生控制电压,改变激光器压电陶瓷的长度,从而调整中频频率以一定的精度维持在期望值附近。此方法具有中频频率可在一定范围内人为设定的特点,适用于测量托卡马克内部电子数密度和磁场分布信息的远红外激光偏振干涉仪中频频率的稳定控制。在此基础上,本论文应用此控制方案制作出了稳频控制器,对中频信号频率控制进行了现场调试,对控制前后的中频信号的频率变化做了对比性分析,结果表明该控制方法及其系统能够很好地实现中频频率的稳定控制。
[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.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248;TL631.24
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