Design of non-contact rotational temperature transmitter for heated drawed roller

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,C8051F 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.