| 摘要 |
Thermoelectric method for measurement of temperature is in fact that one places working end of thermo-couple in thermal contact with controlled object with measurement of initial thermo-electromotive forceat free ends of thermo-couple, with passing direct current through it in direction at which working end is cooled, with gradual increase and periodic interruption of current, one measures thermo-electromotive forceof thermo-couple without current with comparison to initial thermo-electromotive force, one sets compensation current at interruption of which thermo-electromotive forcecomes to its initial value, with determination of temperature by formula. At that one preliminarily fixes temperature of free ends of thermo-coupleat initial thermo-electromotive force, with additional switch-on of compensation current till increase of thermo-electromotive force, one changes direction of flow of compensation current for thermo-couple heating with disconnection of compensation current and measurement of thermo-electromotive force of heated thermo-couple, on switches on compensation current, measures decreased value of thermo-electromotive force, and temperature is determined by formula:,where- temperature of free ends of thermo-couple. |
