Extending the Temperature Range of the National Primary Standard for the Unit of the Thermal Linear Expansion Coefficient

摘要

Work on improving the national primary standard for the unit of the coefficient of linear thermal expansion for solids in order to extend the temperature range from 1800 to 3000 K is described. The composition and metrological characteristics of the standard are discussed, as well as methods for measuring the elongation of test samples and an improved system for transfer of the unit from the standard to working means of measurement.