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

本研究所开发的实时介电弛豫谱仪由波形发生器、电位移检测器、波形分析器和作为系统控制器的个人计算机组成。主要研究内容如下：（1）研制了一种波形分析仪，采用超快ECL门阵列并行处理Walsh-Hadamard变换，同时解调电位移多频响应的所有频率分量。(2)我们研制了一种波形发生器，它可以合成施加到样品上的多频电场波形。从计算机传来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成模拟信号。(3)研制了一种宽带电位移探测器，并制备了用于实验测量的样品池。并开发了测量控制、光谱显示和数据分析的计算机软件。(4)利用该谱仪观察了VDF-TrFE铁电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.