A new technique to measure the temperature of a rotating motor shaft

In the present study, a new technique has been developed for the measurement of the temperature of a motor shaft rotating at high speed. A radiation thermometer could be useful as one of the methods of measuring the surface temperature of said shaft. However, if the cross-sectional diameter of the motor shaft is small, it is necessary to closely approach the shaft rotating at high speed when measuring the temperature. The present paper reports the successful measurement of the local surface temperature and the temperature rise time of a motor shaft with a diameter of 10 mm diameter, rotating at high speed, by utilizing the potential of the melting points of different chemical reagents. The measurements were carried out at a distance of 1 m from the shaft, overcoming the difficulty in the use of a radiation thermometer.