Study on the Methods for Measuring Closed Cell Content of Cellular Glass and its Thermal Insulation Performance

The principle of measuring cellular glass by automatic densimeter was studied. The effect of pressure on closed cell content was researched in order to optimize the measuring pressure. The influence of closed cell content on the insulation property was analyzed by measuring thermal conductivity. The results showed that cell structure of cellular glass can distort or even be damaged with the increasing of pressure and the first condition for obtaining accurate closed cell content was to optimize the measuring condition and determine appropriate pressure. Closed cell content affects the insulation property of the cellular glass significantly.

The Testing and Verifying Method for a New Principle

A new measurement theory, it is not enough for the proof in math only, from the point of engineering view, it must be verified by practice. In this paper, the disadvantage of traditional method of indirect testing method is discussed and the concept of repeating and reappearing from the theory of accuracy was used in this new method to support to judge weather a new principle of measurement is advanced or not. On the same measuring condition, the test system 1 is compares with system 2, if the measuring error of system 1 is too small to measure by system 2, the accuracy of system 1 is not lower than system 2, vice versa.