Measuring accuracy of temperature on the surface of heated drawing roller directly affects the control accuracy of the system, so a rotational temperature transmitter was designed to solve the problem of accurate temperature measurement of the rollers under high speed rotating and intense electromagnetic environment. The equipment used inductive coupled power transfer technology to supply non-contact power for its rotating part, C8O51F microcomputer with integrated analog-to-digital converter to complete temperature acquisition and processing, and infrared technology to solve the problem of data transmission of rotating part and anti-interference. The software design of transmitter adopted the sliding window filter for interference suppression and the method of piecewise linear interpolation for improving measurement accuracy. It is proved that when the rotation speed of the roller is as high as 8 000 r/min, non-contact power and infrared transmission work stably and the measurement accuracy can reach 0.1 ℃. The running of over three months shows that the stability and measuring accuracy of the transmitter have reached the design requirements.%热牵伸辊表面温度测量精确度直接影响热牵伸辊温控系统的控制精度,为此设计了旋转温度变送器,以解决热牵伸辊在高速旋转和高电磁强度下的精确测温问题.设备采用感应耦合电能传输技术,为其旋转部件非接触供电,使用集成了数模转换器的C8051F单片机完成温度采集和处理,并利用红外技术解决旋转部件的数据传输和抗干扰问题.软件方面采用滑窗平均滤波算法抑制干扰,用分段线性插值法提高测温准确性.在辊体转速高达8 000 r/min的情况下,非接触式供电和红外数据传输稳定,温度测量精度达到0.1℃,3个多月运行结果表明,设备的稳定性及测量精度均达到设计要求.
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