Development of Real-Time Dielectric Relaxation Spectrometer by Using Ultrahigh-Speed Gate Arrays

本研究研制的实时介质弛豫光谱仪由波形发生器、电位移检测器、波形分析仪和作为系统控制器的个人计算机组成。研究结果如下：(1)研制了一种波形分析仪，利用超快速ECL门阵列同时解调所有频率分量为电位移的多频响应，对Walsh-Hadamard变换进行并行处理。(2)研制了一种波形发生器，可合成多频电场波形，应用于样品。从计算机传输的波形数据存储在发生器的存储单元中，然后根据计算机选择的时钟脉冲序列转换为模拟信号。(3)构建了宽带电位移检测器，并制备了用于测试测量的样品池。此外，我们开发了测量控制，频谱显示和数据分析的计算机软件。(4)利用谱仪观察了铁电VDF-TrFE共聚物在极化反转过程中高频介电弛豫谱的变化。

The real-time dielectric relaxation spectrometer developed in this study consists of a waveform generator, an electric displacement detector, a waveform analyzer and a personal computer as a system controller. A summary of the study is as follows:(1) We developed a waveform analyzer which performs a parallel processing of Walsh-Hadamard transform by using ultra-fast ECL gate arrays to demodulate simultaneously all the frequency components is the multi-frequency response of electric displacement.(2) We developed a waveform generator which synthesizes a multi-frequency waveform of electric field to be applied to the sample. The waveform data, transferred from the computer, are stored in the memory unit of the generator and are then converted to an analog signal according to the clock pulse sequence selected by the computer.(3) We constructed a broadband electric displacement detector and prepared a sample cell for a test measurement. Further, we developed computer softwares for measurement control, spectrum display and data analysis.(4) By using the spectrometer, we observed the change in the high-frequency dielkectric relaxation spectra of ferroelectric VDF-TrFE copolymers in the course of polarization reversal.