【摘要】 采用有效值测量代替峰值测量的方法,并采用方波的直流分量与方波的高电平峰值之比代替占空比,从而间接测量相位差的方法,对样品的介电谱进行测量。运用虚拟仪器技术,将温度监控系统与介电谱测试系统相结合,设计并实现了温度监控与介电谱测试系统。该系统可以对样品温度变化情况进行实时跟踪记录,对制冷器的制冷情况进行随动控制,对样品的介电温谱及介电频谱进行测试并记录。实验表明,该系统具有良好的性能。更多还原

【Abstract】 The proposed method is used to measure the dielectric spectrum of the sample,which uses RMS value to replace peak-value and uses the ratio of square-wave DC component to its peak-value to replace duty cycle,so the phase difference can be measured indirectly.Virtual instrument technology is used to design the temperature monitoring and dielectric spectrum systems.This system can measure,track and record the sample temperature in real time,can servo control the cooling effect of the refrigeration chiller,and also can measure and record the dielectric spectrum of the sample.Experiments demonstrate that the system has a perfect performance.更多还原