太赫兹波回波损耗在线检测断路器真空度

Online Detection of Vacuum Level of Circuit Breaker Based on Terahertz Wave Return Loss

针对在线检测断路器灭弧室真空度这一问题,依据太赫兹检测技术原理,采用太赫兹波回波损耗在线检测断路器真空度。首先分析了连续波太赫兹回波损耗应用于真空度在线监测的理论基础,而后利用FDTD仿真断路器灭弧室不同压强下的回波损耗,最后用四个不同真空度的真空泡进行太赫兹检测实验。实验数据与仿真数据对比表明随着真空度下降,太赫兹波谱的回波损耗逐渐增加,即利用连续波太赫兹成像技术所得到的回波损耗波谱能够分辨真空度的变化情况,证明了本文所提出的真空度在线检测方法具备可行性。

For the online detection of vacuum degree in circuit breaker interrupter chamber,based on the principle of terahertz detection technology,the method of online detection of vacuum degree in circuit breaker using terahertz wave return loss is adopted,and the theoretical basis of continuous wave terahertz return loss applied to online vacuum degree monitoring is analyzed.FDTD is used to simulate the return loss of circuit breaker interrupter at different pressures,and four vacuum bubbles with different vacuum degrees are used for terahertz detection experiments.The comparison between the experimental data and the simulation data shows that as the vacuum level decreases,the return loss of the terahertz spectrum gradually increases,i.e.,the return loss spectrum obtained by using continuous wave terahertz imaging technology can distinguish the change of vacuum level,which proves the feasibility of the vacuum level online detection method proposed in this paper.