Abstract
A new method is proposed for accurate measurement of surface temperature of various surfaces. In order to provide known stable surface temperatures, an electrically heated hollow SiC pipe is used.
The surface temperature is measured with a contacting temperature sensor whose initial temperature is controlled before contact. A few trial contacts are made, each being brief and with a different initial temperature. The derivative of temperature change of temperature sensor is recorded each time. By evaluating the recorded derivatives, the true surface temperature is obtained.
The proposed method has the following advantages.
1) No need of large contact pressure onto the surface, and therefore the possibility of applying it onto a very soft surface.
2) Minimum thermal disturbance owing to the employment of the differentiater.
3) Accuracy in the low temperature range (±1°C in 20∼200°C).
4) Convenience for coupling the measurement device with a data handling system.
The paper reviews the historical and available techniques, presents the theoretical background and describes the experimental setup, the instrumentation and the test results.
