【摘要】 本文研究了基于Win98/2000的低频力学谱仪的先进测试技术———虚拟仪器、相位差的数字相关计算、内耗固有背景的处理、Windows操作系统下的精确定时采样、直接数字频率合成产生低频信号等。文中还给出了基于Win98/2000的低频力学谱仪的组成和典型实验数据。本文研制的低频力学谱仪在测量精度、测试自动化程度及数据处理等方面的性能与以往的固体内耗仪相比都大大提高了。更多还原

【Abstract】 Mechanical spectroscopy reflects the mechanical interaction characteristics between mechanical wave and solid materials.The low frequency mechanical spectroscopy test is an important method to study the mechanical,electric and magnetic characteristics of solid materials.Testing solid material under different temperatures,frequencies and strain amplitudes can discover the internal structure,defect and dislocation of the material,and study the crystal motion rule or its phase interface.Advanced mechanical spectroscopy test technique ensures the accuracy and reliability of the experiment data.In this paper the advanced mechanical spectroscopy test technique based on Win98/2000 is studied,which involves the topics such as virtual instrument,phase difference correlation calculation,inherent internal friction background processing,sampling at accurate time in Windows OS(Operating System),direct digit frequency synthesis and so on.The structure of the low frequency mechanical spectroscopy instrument(LFMSI) based on Win98/2000 is introduced,and the typical experiment data are presented.The performance of the proposed LFMSI is improved greatly in measurement accuracy,test automation level and data processing capability comparing with early internal friction instruments.更多还原