Optical Telemetering of Temperature Information in Rotating Spindle (2nd Report) : Extension of Measuring Period and Measurement in the Case with Thermocouple Hot Junction Short-circuited to Spindle

This paper deals with an improvement of the telemetering system for practical use. Large capacity rechargeable battery and power supply regulator are adopted and 22.5 hours continuous measurement is confirmed. Output of the telemetering system with thermocouple hot junction short-circuited to the spindle is fluctuated accompanied by spindle rotation. For this fluctuation the following three procedures are applied and the measurement accuracy of the telemetering system with error less than 0.1℃ is confirmed : low-pass filtering, using averaged data of temperature and shortening the length between two contact points of thermocouple hot-junction contacting with the spindle. Also the inner-surface temperature of inner-race of rolling bearing is measured