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加热温度是光纤熔融拉锥制造中的关键因素,直接影响器件的性能。为了提高加热区域温度的稳定性和可控性,设计了高压电弧加热装置,并对电弧加热、弧区温度和光纤预热进行了分析。设计了高频高压电源和电极。电源的电流和频率独立可调,采用电压闭环和电流控制确保引弧成功和提高电弧放电电流的稳定性,并分析了其放电过程。建立了弧区温度测量实验平台,采用红外热像仪测量加热中陶瓷棒的温度,得到了弧区温度。通过实验确定了频率、电弧控制电压以及加热距离与弧区温度的关系。通过电弧控制电压和通过加热距离控制电弧加热区的温度。通过计算得到电弧弧区的中心温度可达到1635℃,实验测得稳定性为2.37℃。建立了细径光纤(直径80μm)的加热模型,通过有限元的瞬态分析确定了预热时间,经过25 s,光纤加热区达到稳定。
The heating temperature is a key factor in the manufacture of a fiber-optic taper and has a direct impact on the device’s performance. In order to improve the stability and controllability of the temperature in the heating zone, a high voltage arc heating device was designed and the arc heating, arc zone temperature and fiber preheating were analyzed. Designed high-frequency high-voltage power supply and electrode. The current and frequency of the power supply are independently adjustable. The voltage closed loop and current control ensure the success of arc ignition and the stability of arc discharge current. The discharge process is also analyzed. An experimental platform for temperature measurement of the arc zone was established. The temperature of the ceramic rod during heating was measured by infrared thermography, and the temperature of the arc zone was obtained. The relationship between the frequency, the arc control voltage and the heating distance and the temperature of the arc zone was determined experimentally. The temperature of the arc heating zone is controlled by the arc control voltage and by the heating distance. By calculation, the center temperature of the arc arc zone can reach 1635 ℃, and the stability of experiment is 2.37 ℃. A heating model of a narrow diameter fiber (diameter 80μm) was established. The preheating time was determined by the transient analysis of the finite element. After 25 s, the fiber heating area was stable.