一、前言材料的线膨胀系数是工程设计的重要参数之一,也是研究材料结构变化的可靠信息。因此膨胀系数测试技术及仪器的研究一直受到广泛的重视。已经有许多种类型的膨胀仪在科研生产上被采用。然而这些商品膨胀仪多以棒状刚性材料作为试样,借助于试样的膨胀力推动传递杆,把位移量(试样伸长量)传递给检测器,经放大后进行记录。 I. Introduction The linear expansion coefficient of materials is one of the important parameters of engineering design and also a reliable information for studying the change of material structure. Therefore, the expansion coefficient test technology and instrument research has been widely valued. There are many types of dilatometers that have been used in research and production. However, most of these commodity dilators use rod-shaped rigid material as a sample, and the transmitting rod is pushed by the expansion force of the sample to transmit the displacement (sample elongation) to the detector, and after amplification, the recording is performed.