一、序言 为了改善金属板材的轧制质量和提高生产率,目前轧钢机组正朝着大型化、连续化和高速化发展,尤其是采用了以电子计算机作为控制中枢的自动化系统后,对轧制线上的仪表提出了更严格的要求,既要求反应速度快、测量精度高;又要求在恶劣的工作条件中(温度高、湿度大、灰尘大、振动大、 I. Preface In order to improve the rolling quality of metal sheet and improve the productivity, the current rolling mill is moving toward large-scale, continuous and high-speed development, especially with the use of electronic computer as the control center of the automation system, the rolling line On the instrument made more stringent requirements, both require fast response, high accuracy; also requires that in the harsh working conditions (high temperature, humidity, dust, vibration,