APPARATUS FOR THERMAL ANALYSIS

摘要

A method and apparatus for high measurement of heat content which includes an electric furnace in which a sample holding container of predetermined dimensions is placed. A pair of differentially connected thermocouples are disposed such that one measures the temperature of the container walls as a reference and the other the temperature of the sample. A source of bias voltage is used to cause the hot junction of the reference thermocouple to be maintained at a given temperature differential above the other thermocouple. A control system is operatively connected to the thermocouples and to the power source of the furnace to vary the amount of heat delivered to the container responsive to maintaining the predetermined temperature differential between the thermocouples as established by the bias voltage. The temperature of the sample is then recorded versis the time required for the temperature of the sample to reach the upper limit of the temperature range of the test run.