Isobaric dilatometer

摘要

An isobaric mercury dilatometer for measurements of volume changes of solid specimens under a constant hydrostatic pressure either as a function of time or as a function of temperature. It includes structures for minimizing entrapment of air in the system, accurate computerized measurements in spite of the presence of some air. A two-piece stainless steel container is equipped with a horizontally situated volume-measuring stem, a filling device, an air vent and a temperature sensor. The specimen to be studied is placed in the container which is subsequently filled with mercury up to the stem. The volume changes of the specimen is reflected to the capacitance signals of an aluminum sleeve around the stem, while the temperature sensor generates temperature-related electronic signals. Both signals are received by a computer which translates them into volume and temperature data.