| 摘要 |
PURPOSE:To make it possible to obtain more exact heat conductivity of an object to be measured by evaluating effectivity thermal flow density by giving weight according to the thermal conditions of the environment of the object at the heat input side and heat output side. CONSTITUTION:The temperature difference of both faces of an object 13 to be measured that is placed inside of a constant temperature chamber 11 is detected by a differential thermocouple 15 and a temperature difference regulator 14 controls the quantity of heat generation of a heating plate 16 based on the output of the differential thermocouple 15 in order to keep the temperature difference constant. On the other hand outputs V1 and V2 of colorimeters 19 and 20 that are placed on both faces of the object 13 are sent to an amplifier 25 after being assigned respectively a weight (m) and examination constants A1 and A2 by amplifiers 21 and 22 and variable resistors 23 and 24, and the coefficient 1/(1+m) is processed. Further, the output of the amplifier 25 is multiplied by the thickness L of the object 13 by means of a potentiometer 18, and the temperature difference DELTAT is processed by the amplification of an amplifier 26, and the heat conductivity of the object 13, lambda=A1 L[V1+m(A2/A1)V2]/(1+m)DELTAT is displayed on an indicator 27. |
