Abstract: Measuring accuracy of temperature on the surface of heated drawing roller affects directly control accuracy of the system, so rotational temperature transmitter was designed to solve the problem on accurate temperature measurement when roller was spinning and electromagnetic interference was very serious. The equipment used inductive coupled power transfer technology to supply non-contact power for its rotating part. It used C8051F microcomputer integrated analog-to-digital converter to complete temperature acquisition and treatment, and used infrared technology to solve the problem on data transmission of rotating part and anti-interference. The software design of transmitter was with the sliding window filter for interference suppression and with the method of piecewise linear interpolation for improving measurement accuracy. It is proved that when the roller is spinning at the speed of 8000 rpm, non-contact power and infrared transmission work stably and the measurement accuracy can reach 0.1 degrees Celsius. Experiment results over three months show that stability and measuring accuracy of the transmitter have reached the design requirements.

Key words: heated drawed roller, rotational temperature transmitter, non-contact power supply, C8051Fmicrocomputer, infrared transmission