基于倒扭摆式流变仪的设计与应用  

The Viscosity Measurement Based on the Torsion Reversed Pendulum Rheometer

作　　者：孟治国[1] 熊小敏[2] 

机构地区：[1]广东轻工职业技术学院电子系,广东广州510300 [2]中山大学物理系,广东广州510275

出　　处：《实验室研究与探索》2013年第10期36-38,58,共4页Research and Exploration In Laboratory

摘　　要：为测量低黏度液体的黏度等流变性质,建立测量系统的力学谱理论模型。设计的倒扭摆流变仪能测量应力、应变以及两者的相位差,通过计算机可产生能连续变频的正弦波信号,经数模转换和功率放大后输入驱动线圈,线圈中的电流信号与应力相关,利用光杠杆原理测量振子的运动,此应变信号经放大,与电流信号同时输入计算机。经过傅里叶变换后可得到应变落后于应力的相位差,当测量频率接近系统共振频率时样品黏度的微小改变都会在相位差上有较大的反映,有利于缩小相位差的测量误差。利用共振频率附近通过相位差测量黏度可以有效地提高测量精度,从原理上对测量结果做定量分析。这种分析较好地解释了测量结果,证明共振流变仪的应用价值。In order to measure some rheological properties such as viscosity of the low viscosity liquid, it is set up theory model of the mechanical spectrum in measurement. The rheometer designed uses to measure and the phase difference. The continuous variable-frequency sine signals, as stress, are produced by a computer through the AD conversion and power amplification, and input drive coil. The strain signal amplified is oscillator motion measured using optical lever principle. The stress and strain input into computer together, it can get the phase difference through Fourier transform. When measuring frequency is close to the system resonance frequency, the phase difference will have larger reaction as the sample viscosity has small change, so that the design can reduce phase difference measurement error in the resonant frequency, and can effectively improve the measurement precision through the phase difference measurement of viscosity. It expounds measuring principle and function realization of the rheometer, makes quantitative analysis to measurement results from the principle and explains the measurement results. The rheometer has application value is proved.

关 键 词：倒扭摆 流变仪 黏度测量 精度 

分 类 号：TP635[自动化与计算机技术—控制理论与控制工程] G432[自动化与计算机技术—控制科学与工程]